Occupational Safety and Health Administration OSHA

Modification of the Hazard Communication Standard (HCS) to conform with the United Nations' (UN) Globally Harmonized System of Classification and Labeling of Chemicals (GHS)

Questions and Answers

A. The Globally Harmonized System (GHS) is an international approach to hazard communication, providing agreed criteria for classification of chemical hazards, and a standardized approach to label elements and safety data sheets. The GHS was negotiated in a multi-year process by hazard communication experts from many different countries, international organizations, and stakeholder groups. It is based on major existing systems around the world, including OSHA's Hazard Communication Standard and the chemical classification and labeling systems of other US agencies.

The result of this negotiation process is the United Nations' document entitled "Globally Harmonized System of Classification and Labeling of Chemicals," commonly referred to as The Purple Book. This document provides harmonized classification criteria for health, physical, and environmental hazards of chemicals. It also includes standardized label elements that are assigned to these hazard classes and categories, and provide the appropriate signal words, pictograms, and hazard and precautionary statements to convey the hazards to users. A standardized order of information for safety data sheets is also provided. These recommendations can be used by regulatory authorities such as OSHA to establish mandatory requirements for hazard communication, but do not constitute a model regulation.

A. OSHA has modified the Hazard Communication Standard (HCS) to adopt the GHS to improve safety and health of workers through more effective communications on chemical hazards. Since it was first promulgated in 1983, the HCS has provided employers and employees extensive information about the chemicals in their workplaces. The original standard is performance-oriented, allowing chemical manufacturers and importers to convey information on labels and material safety data sheets in whatever format they choose. While the available information has been helpful in improving employee safety and health, a more standardized approach to classifying the hazards and conveying the information will be more effective, and provide further improvements in American workplaces. The GHS provides such a standardized approach, including detailed criteria for determining what hazardous effects a chemical poses, as well as standardized label elements assigned by hazard class and category. This will enhance both employer and worker comprehension of the hazards, which will help to ensure appropriate handling and safe use of workplace chemicals. In addition, the safety data sheet requirements establish an order of information that is standardized. The harmonized format of the safety data sheets will enable employers, workers, health professionals, and emergency responders to access the information more efficiently and effectively, thus increasing their utility.

Adoption of the GHS in the US and around the world will also help to improve information received from other countries—since the US is both a major importer and exporter of chemicals, American workers often see labels and safety data sheets from other countries. The diverse and sometimes conflicting national and international requirements can create confusion among those who seek to use hazard information effectively. For example, labels and safety data sheets may include symbols and hazard statements that are unfamiliar to readers or not well understood. Containers may be labeled with such a large volume of information that important statements are not easily recognized. Given the differences in hazard classification criteria, labels may also be incorrect when used in other countries. If countries around the world adopt the GHS, these problems will be minimized, and chemicals crossing borders will have consistent information, thus improving communication globally.

A. The table below summarizes the phase-in dates required under the revised Hazard Communication Standard (HCS):

Effective Completion Date Requirement(s) Who

December 1, 2013

Train employees on the new label elements and safety data sheet (SDS) format.


June 1, 2015*

December 1, 2015

Compliance with all modified provisions of this final rule, except:

The Distributor shall not ship containers labeled by the chemical manufacturer or importer unless it is a GHS label

Chemical manufacturers, importers, distributors and employers

June 1, 2016

Update alternative workplace labeling and hazard communication program as necessary, and provide additional employee training for newly identified physical or health hazards.


Transition Period to the effective completion dates noted above

May comply with either 29 CFR 1910.1200 (the final standard), or the current standard, or both

Chemical manufacturers, importers, distributors, and employers

*This date coincides with the EU implementation date for classification of mixtures

During the phase-in period, employers would be required to be in compliance with either the existing HCS or the revised HCS, or both. OSHA recognizes that hazard communication programs will go through a period of time where labels and SDSs under both standards will be present in the workplace. This will be considered acceptable, and employers are not required to maintain two sets of labels and SDSs for compliance purposes.

A. OSHA is requiring that employees are trained on the new label elements (i.e., pictograms, hazard statements, precautionary statements, and signal words) and SDS format by December 1, 2013, while full compliance with the final rule will begin in 2015.  OSHA believes that American workplaces will soon begin to receive labels and SDSs that are consistent with the GHS, since many American and foreign chemical manufacturers have already begun to produce HazCom 2012/GHS-compliant labels and SDSs.  It is important to ensure that when employees begin to see the new labels and SDSs in their workplaces, they will be familiar with them, understand how to use them, and access the information effectively.  For more information: http://www.osha.gov/dsg/hazcom/effectivedates.html.

A. The three major areas of change are in hazard classification, labels, and safety data sheets.

  • Hazard classification: The definitions of hazard have been changed to provide specific criteria for classification of health and physical hazards, as well as classification of mixtures. These specific criteria will help to ensure that evaluations of hazardous effects are consistent across manufacturers, and that labels and safety data sheets are more accurate as a result.
  • Labels: Chemical manufacturers and importers will be required to provide a label that includes a harmonized signal word, pictogram, and hazard statement for each hazard class and category. Precautionary statements must also be provided.
  • Safety Data Sheets: Will now have a specified 16-section format.

The GHS does not include harmonized training provisions, but recognizes that training is essential to an effective hazard communication approach. The revised Hazard Communication Standard (HCS) requires that workers be re- trained within two years of the publication of the final rule to facilitate recognition and understanding of the new labels and safety data sheets.

For a side-by-side comparison of the current HCS and the final revised HCS please see OSHA's hazard communication safety and health topics webpage at: http://www.osha.gov/dsg/hazcom/index.html.

A. The revised Hazard Communication Standard (HCS) is a modification to the existing standard. The parts of the standard that did not relate to the GHS (such as the basic framework, scope, and exemptions) remained largely unchanged. There have been some modifications to terminology in order to align the revised HCS with language used in the GHS. For example, the term "hazard determination" has been changed to "hazard classification" and "material safety data sheet" was changed to "safety data sheet." OSHA stakeholders commented on this approach and found it to be appropriate.

A. In the Notice of Proposed Rulemaking (NPRM), OSHA proposed to include hazards currently covered under the Hazard Communication Standard (HCS) that have yet to be addressed by the GHS (OSHA provided several examples: simple asphyxiants, and combustible dust) in a separate category called "Unclassified Hazards". In response to comments from the regulated community, OSHA has renamed the category to "Hazards Not Otherwise Classified (HNOC)" to minimize confusion. In the final HCS, HNOC hazards will not be required to be disclosed on the label but will be required to be disclosed in section 2 of the Safety Data Sheet (SDS). This reflects how GHS recommends these hazards should be disclosed. Chemical manufacturers and importers are expected to assess these hazards when they are conducting their hazard evaluation of physical and health hazards. A new or separate evaluation is not required. Also in the final standard, in response to comments, OSHA has removed pyrophoric gases, simple asphyxiants, and combustible dust from the HNOC hazard category and has addressed these chemicals individually (see question below for more information on each hazard).

A. Under both the current Hazard Communication Standard (HCS) and the revised HCS, an evaluation of chemical hazards must be performed considering the available scientific evidence concerning such hazards. Under the current HCS, the hazard determination provisions have definitions of hazard and the evaluator determines whether or not the data on a chemical meet those definitions. It is a performance-oriented approach that provides parameters for the evaluation, but not specific, detailed criteria. The hazard classification approach in the revised HCS is quite different. The revised HCS has specific criteria for each health and physical hazard, along with detailed instructions for hazard evaluation and determinations as to whether mixtures or substances are covered. It also establishes both hazard classes and hazard categories—for most of the effects; the classes are divided into categories that reflect the relative severity of the effect. The current HCS does not include categories for most of the health hazards covered, so this new approach provides additional information that can be related to the appropriate response to address the hazard. OSHA has included the general provisions for hazard classification in paragraph (d) of the revised rule, and added extensive appendixes (Appendixes A and B) that address the criteria for each health or physical effect.

A. Under the current Hazard Communication Standard (HCS), the label preparer must provide the identity of the chemical, and the appropriate hazard warnings. This may be done in a variety of ways, and the method to convey the information is left to the preparer. Under the revised HCS, once the hazard classification is completed, the standard specifies what information is to be provided for each hazard class and category. Labels will require the following elements:

  • Pictogram: a symbol plus other graphic elements, such as a border, background pattern, or color that is intended to convey specific information about the hazards of a chemical. Each pictogram consists of a different symbol on a white background within a red square frame set on a point (i.e. a red diamond). There are nine pictograms under the GHS. However, only eight pictograms are required under the HCS.
  • Signal words: a single word used to indicate the relative level of severity of hazard and alert the reader to a potential hazard on the label. The signal words used are "danger" and "warning." "Danger" is used for the more severe hazards, while "warning" is used for less severe hazards.
  • Hazard Statement: a statement assigned to a hazard class and category that describes the nature of the hazard(s) of a chemical, including, where appropriate, the degree of hazard.
  • Precautionary Statement: a phrase that describes recommended measures to be taken to minimize or prevent adverse effects resulting from exposure to a hazardous chemical, or improper storage or handling of a hazardous chemical.

A. Yes, OSHA will continue to allow NFPA and/or HMIS rating systems on labels and SDSs as supplemental information.  However, the rules for labeling and placement on the SDSs still apply.  See below for a detailed discussion on how one can use NFPA and/or HMIS rating systems on labels and SDSs.

a) For workplace labels:

OSHA has retained the same flexible approach to in-plant labeling in the revised standard as it did in the 1994 Hazard Communication Standard (HCS).  Employers may create their own labeling system that works for their workplace and employee population.  Or, employers can continue to use their current labeling system as long as all of the required information is immediately available to employees when they are in their work areas.

For the workplace label, the container must be labeled, tagged, or marked with either the:

Product identifier, signal word, pictogram(s), hazard statement(s), and precautionary statement(s) of the hazardous chemical; OR

Product identifier and words, pictures, symbols, or a combination of these that provide at least general information about the hazards of the chemicals, and which, in conjunction with the other information immediately available, provides employees with the specific information about the physical and health hazards of the hazardous chemical.

The employer may use signs, placards, process sheets, batch tickets, operating procedures, or other such written materials in lieu of affixing labels to individual stationary process containers, as long as the alternative method identifies the containers to which it is applicable and conveys the information required by 29 CFR 1910.1200 (f)(6), outlined above, to be on a label.  The employer must ensure the written materials are readily accessible to the employees in their work area throughout each work shift.

Other systems, such as the NFPA 704 hazard rating system and the HMIS are permitted for workplace containers.  However, these labels must provide at least general information regarding the hazards of the chemicals.  Hazard warnings or pictograms that conflict with those required by HCS for the chemical may not appear on the workplace label.  When such rating systems are used, employees must be trained on how to use and understand the alternative labeling systems so that employees are aware of the effects of the hazardous chemicals to which they are potentially exposed.

In other words:

Employers may choose to label workplace containers either with the same label required for shipped containers of the chemical, or may instead use alternative labels, as long as those labels provide employees with general information about the hazards of the chemical, and the employer provides training so that employees exposed to the chemical understand the specific hazards it presents.

b) For SDSs:
The HMIS and NFPA information is not required on SDSs; however, such information may be included if it does not contradict or cast doubt on the Hazard Communication classification.

c) For labels on shipped containers:
The HCS has specific requirements for label elements (see 29 CFR 1910.1200(f)(1)).  However, chemical manufacturers and importers are free to provide additional information regarding the hazardous chemical and precautions for safe handling and use.  This is referred to as supplemental information.  OSHA will allow the NFPA and HMIS rating systems to be used on the labels if it does not contradict or cast doubt on the information required by the HCS.  OSHA has published several guidance products on labeling, including an OSHA Brief, located at: http://www.osha.gov/Publications/OSHA3636.pdf**.

Labeling of Pipes

A.  Yes, employers are permitted to use color coding to identify chemicals in pipes.  Pipes are not required to be labeled with HCS labels because they are not considered “containers” under the HCS.  Employees must be informed of and trained on the hazards associated with chemicals in unlabeled pipes, and the measures employees can take to protect themselves from these hazards.  See the next question for an explanation of training requirements.

A.  The HCS requires employers to train employees on the hazards associated with the chemicals in their work area when an employee receives his/her initial work assignment, and whenever a new physical or health hazard is introduced into the employee’s work area.  This training must include, among other things, information about operations where hazardous chemicals are present, the kinds of hazards those chemicals present, methods to detect the presence or release of those chemicals, and the measures employees can take to protect themselves from these hazards.  Therefore, if there are pipes or piping systems containing hazardous chemicals within employees’ work areas, the employees must receive effective information and training on these hazards.  This must include information on the pipe the coding system and any other  labeling requirements established by other standards that address pipes and piping systems, the hazards of the chemicals in those pipes, the methods used to detect a leak from those pipes, and methods the should follow in the event the pipes leak or rupture.  Workers who are assigned to work on such pipes should also be trained on how to protect themselves from the hazards of the chemicals in the pipes.

Labeling of Small Packages

A.  OSHA reviews labeling small packages on a case-by-case basis to determine whether a practical accommodation is warranted.  The agency has issued several letters of interpretation that may assist in answering your question on small package labeling more fully.  The links to the letters are provided below:

Letter #1 addresses questions and any accommodations for small bottles from 5 ml to 50 ml in size.  [Dr. Robert L. Watters, Jr. letter, dated 06/04/ 2013]  The letter is located at:  http://www.osha.gov/pls/oshaweb/owadisp.show_document?p_table=INTERPRETATIONS&p_id=28805.

Letter #2 addresses questions related to standards for 2 to 5 ml vials.  The letter [Bruntrager/Celestino [USP] letter, dated 09/20/2013] is located at: http://www.osha.gov/pls/oshaweb/owadisp.show_document?p_table=INTERPRETATIONS&p_id=29183.

A. There are nine pictograms under the GHS to convey the health, physical and environmental hazards. The final Hazard Communication Standard (HCS) requires eight of these pictograms, the exception being the environmental pictogram, as environmental hazards are not within OSHA's jurisdiction. The hazard pictograms and their corresponding hazards are shown below.

HCS Pictograms and Hazards

Health Hazard
Health Hazard

  • Carcinogen
  • Mutagenicity
  • Reproductive Toxicity
  • Respiratory Sensitizer
  • Target Organ Toxicity
  • Aspiration Toxicity


  • Flammables
  • Pyrophorics
  • Self-Heating
  • Emits Flammable Gas
  • Self-Reactives
  • Organic Peroxides

Exclamation Mark
Exclamation Mark

  • Irritant (skin and eye)
  • Skin Sensitizer
  • Acute Toxicity (harmful)
  • Narcotic Effects
  • Respiratory Tract Irritant
  • Hazardous to Ozone Layer
  • (Non Mandatory)

Gas Cylinder
Gas Cylinder

  • Gases under Pressure


  • Skin Corrosion/ burns
  • Eye Damage
  • Corrosive to Metals

Exploding Bomb
Exploding Bomb

  • Explosives
  • Self-Reactives
  • Organic Peroxides

Flame over Circle
Flame over Circle

  • Oxidizers

(Non Mandatory)


  • Aquatic Toxicity

Skull and Crossbones
Skull and Crossbones

  • Acute Toxicity (fatal or toxic)

Precautionary Statements on Labels

A.  No, OSHA does not have a limit on the number of precautionary statements that appear on the label.  OSHA requires all of the appropriate precautionary statements to appear on the label to warn users of the hazards of the chemical in question.  However, OSHA does allow for some flexibility when identifying the appropriate precautionary statement(s) for labels, as explained below:

  • a) OSHA allows precautionary statements to be combined or consolidated to save label space.  See Appendix C.2.4.6.  An example provided in Appendix C.2.4.6 states: “Keep away from heat, sparks and open flame,” “Store in a well-ventilated place” and “Keep cool” can be combined to read “Keep away from heat, sparks and open flame and store in a cool, well-ventilated place.”

  • b) In addition, where a chemical is classified for a number of hazards, and the precautionary statements are similar, the most stringent must be included on the label (we expect this to apply mostly to preventive measures) and the less stringent may be omitted.

  • c) The chemical manufacturer, importer or responsible party may identify an order of precedence for displaying precautionary statements on the label in situations where phrases relate to a required response action.  This may occur in cases where rapid action may be crucial.  For example, if a chemical is carcinogenic and acutely toxic, rapid action may be crucial; therefore, the employer may decide to display first aid measures for the acute toxicity hazards before precautionary statements about effects that occur over a longer time, such as medical attention required for delayed health effects in cases of incidental exposure.

Finally, if the chemical manufacturer, importer, or responsible party can demonstrate that a precautionary statement is inappropriate for a specific chemical, it may omit the precautionary statement from the label.

Blank Pictograms

A. Labels may not contain blank “square-on-point” (red borders with no symbol).  Blacked out pictogram borders are compliant with the requirements of HCS 2012 as they are not a “square red frame set at a point without a hazard symbol.”  However, if a blank red frame is not fully covered or filled in, the label would not be in compliance.  Please note that downstream customers may inquire whether the blacking-out was done deliberately by the manufacturer or whether the label has been defaced.

A. Under the revised Hazard Communication Standard (HCS), pictograms must have red borders. OSHA believes that the use of the red frame will increase recognition and comprehensibility. Therefore, the red frame is required regardless of whether the shipment is domestic or international.

A. The revised Hazard Communication Standard (HCS) requires that all red borders printed on the label have a symbol printed inside it. If OSHA were to allow blank red borders, workers may be confused about what they mean and concerned that some information is missing. OSHA has determined that prohibiting the use of blank red borders on labels is necessary to provide the maximum recognition and impact of warning labels and to ensure that users do not get desensitized to the warnings placed on labels.

A. In the revised Hazard Communication Standard (HCS), OSHA is lifting the stay on enforcement regarding the provision to update labels when new information on hazards becomes available. Chemical manufacturers, importers, distributors, or employers who become newly aware of any significant information regarding the hazards of a chemical shall revise the labels for the chemical within six months of becoming aware of the new information, and shall ensure that labels on containers of hazardous chemicals shipped after that time contain the new information. If the chemical is not currently produced or imported, the chemical manufacturer, importer, distributor, or employer shall add the information to the label before the chemical is shipped or introduced into the workplace again.

SDSs Provided by an Importer

A.  Yes, once the hazardous chemical arrives in the U.S., the importer becomes the responsible party and cannot ship a chemical without a complete SDS that complies with HCS 2012 after the June 1, 2015 deadline.  Therefore, the importer must ensure that all sections of the SDS are properly filled out, either by performing the classification themselves or by obtaining the information for the manufacturer.  Note that OSHA does not require Sections 12-15 of the SDS to be completed because they concern matters handled by other agencies.  OSHA also requires that the importers’ name and contact information be listed on the SDS and label, even if the product’s SDS arrives in the 16-section format.

OSHA’s HCS 2012 aligns with the United Nations’ Globally Harmonized System of Classification and Labelling of Hazardous Chemicals (GHS).  Many other countries are also implementing the GHS.  The United Nations website lists the countries that are implementing GHS; see http://www.unece.org/trans/danger/publi/ghs/implementation_e.html.  These countries require that chemicals be classified in accordance with the GHS and that information on the chemical be presented on the 16-section SDS.

Hazard Communication of Unknown Acute Toxicity

A.  The unknown acute toxicity statement is required on the label and Section 2 of the SDS where a chemical is classified as acutely toxic, the classification is not based on testing of the mixture as a whole, and there are any relevant ingredients of unknown acute toxicity by any relevant route of exposure.  See §1910.1200, Appendix A, A.1.3.2, A., Appendix C.3.3, Appendix D.

Classifiers can present the unknown acute toxicity information on labels and SDSs either as a single statement or as multiple statements, where routes are differentiated.  If there is an unknown acute toxicity by more than one route, and the classifier chooses to provide one statement in order to save space on the label or SDS, then the route with the highest percentage unknown toxicity will be used in the statement.  The single statement on the label or SDS would state that:

“x % of the mixture consists of ingredient(s) of unknown acute toxicity.”

Because it is possible to have ingredients with unknown toxicity for more than one route (e.g., oral, dermal, inhalation), differentiating the unknown toxicity statement by route is recommended.1  As such, classifiers may also communicate the information as:

x % of the mixture consists of ingredient(s) of unknown acute oral toxicity,

x % of the mixture consists of ingredient(s) of unknown acute dermal toxicity,

x % of the mixture consists of ingredient(s) of unknown acute inhalation toxicity.

For further information please see our enforcement webpage for Letters of Interpretation.  the letter to Ms. Yu addresses questions related to acute toxicity.  When this letter has finished the clearing and vetting process it will be posted on the OSHA Publications site as well as here in FAQs.

1 Revision 4 of the GHS has clarified that the statement of unknown acute toxicity should be differentiated by route, see GHS Rev. 4 (or current version) paragraphs and, and OSHA recommends classifiers follow this guidance.

A. The current standard provides employers with flexibility regarding the type of system to be used in their workplaces and OSHA has retained that flexibility in the revised Hazard Communication Standard (HCS). Employers may choose to label workplace containers either with the same label that would be on shipped containers for the chemical under the revised rule, or with label alternatives that meet the requirements for the standard. Alternative labeling systems such as the National Fire Protection Association (NFPA) 704 Hazard Rating and the Hazardous Material Identification System (HMIS) are permitted for workplace containers. However, the information supplied on these labels must be consistent with the revised HCS, e.g., no conflicting hazard warnings or pictograms.

A. The information required on the safety data sheet (SDS) will remain essentially the same as that in the current standard (HazCom 1994). HazCom 1994 indicates what information has to be included on an SDS, but does not specify a format for presentation or order of information. The revised Hazard Communication Standard (HazCom 2012) requires that the information on the SDS be presented using specific headings in a specified sequence.

Paragraph (g) of the final rule provides the headings of information to be included on the SDS and the order in which they are to be provided. In addition, Appendix D provides the information to be included under each heading. The SDS format is the same as the ANSI standard format which is widely used in the U.S. and is already familiar to many employees.

The format of the 16-section SDS should include the following sections:

  • Section 1. Identification
  • Section 2. Hazard(s) identification
  • Section 3. Composition/information on ingredients
  • Section 4. First-Aid measures
  • Section 5. Fire-fighting measures
  • Section 6. Accidental release measures
  • Section 7. Handling and storage
  • Section 8. Exposure controls/personal protection
  • Section 9. Physical and chemical properties
  • Section 10. Stability and reactivity
  • Section 11. Toxicological information
  • Section 12. Ecological information
  • Section 13. Disposal considerations
  • Section 14. Transport information
  • Section 15. Regulatory information
  • Section 16. Other information, including date of preparation or last revision

The SDS must also contain Sections 12-15, to be consistent with the United Nations' Globally Harmonized System of Classification and Labeling of Chemicals (GHS). Although the headings for Sections 12-15 are mandatory, OSHA will not enforce the content of these four sections because these sections are within other agencies' jurisdictions.

A. OSHA is retaining the requirement to include the American Conference of Government Industrial Hygienists (ACGIH) Threshold Limit Values (TLVs) on the safety data sheet (SDS) in the revised Standard. OSHA finds that requiring TLVs on the SDS will provide employers and employees with useful information to help them assess the hazards presented by their workplaces. In addition to TLVs, OSHA permissible exposure limits (PELs), and any other exposure limit used or recommended by the chemical manufacturer, importer, or employer preparing the safety data sheet are also required.

A. In the revised Hazard Communication Standard (HCS), OSHA has provided classifiers with the option of relying on the classification listings of IARC and NTP to make classification decisions regarding carcinogenicity, rather than applying the criteria themselves. OSHA believes that this will make classification easier for classifiers, as well as lead to greater consistency. In addition, OSHA has provided in non-mandatory Appendix F of the revised rule, guidance on hazard classification for carcinogenicity. Part A of Appendix F includes background guidance provided by GHS based on the Preamble of the IARC "Monographs on the Evaluation of Carcinogenic Risks to Humans" (2006). Part B provides IARC classification information. Part C provides background guidance from the National NTP "Report on Carcinogens" (RoC), and Part D is a table that compares GHS carcinogen hazard categories to carcinogen classifications under IARC and NTP, allowing classifiers to be able to use information from IARC and NTP RoC carcinogen classifications to complete their classifications under the GHS, and thus the HCS.

A. OSHA has retained the requirement to include IARC and NTP classifications on safety data sheets (SDSs). Therefore, if a chemical is listed as a carcinogen by either IARC or NTP, it must be noted on the SDS. Additionally, if OSHA finds a chemical to be a carcinogen, it must be noted on the SDS as well.

A. In the revised Hazard Communication Standard (HCS), OSHA has added pyrophoric gases, simple asphyxiants and combustible dust to the definition of "hazardous chemical". OSHA has also added definitions to the revised HCS for pyrophoric gases and simple asphyxiants, and provided guidance on how to define combustible dust for the purposes of complying with the HCS.

  • Pyrophoric gases:
    OSHA has retained the definition for pyrophoric gases from the current HCS. Pyrophoric gases must be addressed both on container labels and SDSs. OSHA has provided label elements for pyrophoric gases which include the signal word "danger" and the hazard statement "catches fire spontaneously if exposed to air".
  • Simple asphyxiants:
    OSHA has revised the definition of simple asphyxiants that was proposed in the Notice of Proposed Rulemaking (NPRM) as a result of comments from the regulated community. In the final HCS, simple asphyxiants must be labeled where appropriate, and be addressed on SDSs. OSHA has provided label elements for simple asphyxiants which include the signal word "warning" and the hazard statement "may displace oxygen and cause rapid suffocation".
  • Combustible dust:

    OSHA has not provided a definition for combustible dust to the final HCS given ongoing activities in the specific rulemaking, as well as in the United Nations Sub-Committee of Experts on the GHS (UN/SCEGHS). However, guidance is being provided through existing documents, including the Combustible Dust National Emphasis Program Directive CPL 03-00-008, which includes an operative definition, as well as provides information about current responsibilities in this area. In addition, there are a number of voluntary industry consensus standards (particularly those of the NFPA) that address combustible dust.

    In the final HCS, combustible dust hazards must be addressed on labels and SDSs. Label elements are provided for combustible dust in the final HCS and include the signal word "warning" and the hazard statement "May form combustible dust concentrations in the air".

    For chemicals in a solid form that do not present a combustible dust hazard, but may form combustible dusts while being processed in normal downstream uses, paragraph (f)(4) of the HCS allows the chemical manufacturer some flexibility in labeling requirements. The manufacturer or importer to may transmit the label to the customer at the time of the initial shipment, but the label does not need to be included with subsequent shipments unless it changes. This provides the needed information to the downstream users on the potential hazards in the workplace, while acknowledging that the solid metal or other materials do not present the same hazards that are produced when these materials are processed under normal conditions of use.

A. The HCS requires employers to train employees on the hazards associated with the chemicals in their work area when an employee receives his/her initial work assignment, and whenever a new physical or health hazard is introduced into the employee’s work area.  This training must include, among other things, information about operations where hazardous chemicals are present, the kinds of hazards those chemicals present, methods to detect the presence or release of those chemicals, and the measures employees can take to protect themselves from these hazards.  Therefore, if there are pipes or piping systems containing hazardous chemicals within employees’ work areas, the employees must receive effective information and training on these hazards.  This must include information on the pipe the coding system and any other  labeling requirements established by other standards that address pipes and piping systems, the hazards of the chemicals in those pipes, the methods used to detect a leak from those pipes, and methods the should follow in the event the pipes leak or rupture.  Workers who are assigned to work on such pipes should also be trained on how to protect themselves from the hazards of the chemicals in the pipes.

A: OSHA estimates that over 5 million workplaces in the United States would be affected by the revised Hazard Communication Standard (HCS). These are all those workplaces where employees—a total of approximately 43 million of them—could be exposed to hazardous chemicals. Included among these 5 million workplaces are an estimated 90,000 establishments that create hazardous chemicals; these chemical producers employ almost 3 million workers.

A: The revised Hazard Communications Standard's (HCS) total cost, an estimated $201 million a year on an annualized basis for the entire United States, is the sum of four major cost elements. (1) OSHA estimates that the cost of classifying chemical hazards in accordance with the GHS criteria and revising safety data sheets and labels to meet new format and content requirements would be $22.5 million a year on an annualized basis. (2) OSHA estimates that training for employees to become familiar with new warning symbols and the revised safety data sheet format under GHS would cost $95.4 million a year on an annualized basis. (3) OSHA estimated annualized costs of $59 million a year for management to become familiar with the new GHS system and to engage in other management-related activities as may be necessary for industry's adoption of GHS. (4) OSHA estimated annualized costs of $24.1 million for printing packaging and labels for hazardous chemicals in color.

A: OSHA expects that the modifications to the Hazard Communication Standard (HCS) will result in increased safety and health for the affected employees and reduce the numbers of accidents, fatalities, injuries, and illnesses associated with exposures to hazardous chemicals. The GHS revisions to the HCS standard for labeling and safety data sheets would enable employees exposed to workplace chemicals to more quickly obtain and to more easily understand information about the hazards associated with those chemicals. In addition, the revisions to HCS are expected to improve the use of appropriate exposure controls and work practices that can reduce the safety and health risks associated with exposure to hazardous chemicals.

OSHA estimates that the revised HCS will result in the prevention of 43 fatalities and 585 injuries and illnesses (318 non-lost-workday injuries and illnesses, 203 lost-workday injuries and illnesses, and 64 chronic illnesses) annually. The monetized value of this reduction in occupational risks is an estimated $250 million a year on an annualized basis.

OSHA estimates that the revised HCS will result in savings of $475.2 million from productivity improvements for health and safety managers and logistics personnel, $32.2 million during periodic updating of SDSs and labels, and $285.3 million from simplified hazard communication training.

OSHA anticipates that, in addition to safety and health benefits, the revised HCS will result in four types of productivity benefits: (1) for chemical manufacturers, because they will need to produce fewer SDSs in future years; (2) for employers, in providing training to new employees as required by the existing OSHA HCS through the improved consistency of the labels and SDSs. (3) for firms engaging in, or considering engaging in, international trade.

A. It is expected that the GHS will be a living document and is expected to remain up-to-date and relevant; therefore further changes may be adopted on a two year cycle. Presently most of the recent updates have been clarification of text. However, OSHA anticipates that future updates of the Hazard Communication Standard (HCS) may be necessary and can be done through various rulemaking options, including:

  • Technical updates for minor terminology changes,
  • Direct Final Rules for text clarification, and
  • Notice and Comment rulemaking for more substantive or controversial updates such as additional criteria or changes in health or safety hazard classes or categories.

A. In 29 CFR 1910.1200, Appendix D, OSHA requires that chemical manufacturers and importers disclose in Section 3 of the SDS, Composition/information on ingredients, the chemical name and concentration (exact percentage) of all ingredients present in a mixture which are classified as health hazards. Ingredient concentrations are required to be disclosed if they are present above their cut-off value/concentration limits or if they present a health risk below the cut-off value/concentration limits. The concentration (exact percentage) must be specified unless a trade secret claim is made, when there is batch-to-batch variability in the production of a mixture, or for a group of substantially similar mixtures with similar chemical composition. In these cases concentration ranges may be used.

Batch-to-batch variability occurs when the mixture has a set formula but there may be some very small differences among the batches that occur during the production process. To use a range in this situation, these variations must have no impact on the hazard of the overall mixture.  For example, the formula may require 4.0 pounds of a chemical, but as produced the final product varies by ± 0.1 pound from that specification. In this case, assuming the high end of the variation does not change the hazard classification, the SDS preparer may choose to use either the concentration set in the formula or the concentration range anticipated between the batches.

In addition, a range of concentrations may be used in situations where a chemical manufacturer or importer may have a line of products that are very similar, but can vary slightly in composition to meet the needs of customers.  For example, toner colors may be changed by the amount of pigment present in the mixture. Another example is the blending of dry materials where the ingredients are the same.  In these cases, the hazards remain the same, even though there may be small differences in the amounts from product to product. For these substantially similar mixtures, providing that the composition differences are minimal and the hazards remain the same, concentration ranges may be used for multiple, similar products.

The standard allows chemical manufacturers and importers to claim the specific chemical identity and/or the exact percentage of a hazardous ingredient in a mixture as a trade secret. If the exact percentage of a hazardous ingredient in a mixture is withheld, a concentration range may be used in its place. The use of a concentration range in this case would assist downstream users in providing appropriate protections and, at the same time potentially eliminate requests from users for disclosure of the trade secret in accordance with §1910.1200. Trade secret status may be claimed for exact percentage composition but not for concentration ranges. For example, when using a concentration range due to batch-to-batch variability you cannot claim the range as a trade secret on the safety data sheet.

In general, if a classifier uses a range of concentrations on the SDS, OSHA expects that the range will be sufficiently narrow to meet the intent of disclosing the actual concentration range, provided that the range is an accurate representation of the variation. A range of 1%-99%, for instance, would not be an acceptable range.  Concentration ranges, if used, must be based on the information available to the classifier, such as analysis results, product specification, or nature of the process, and the high end of the range used may not change the reported hazard classification.

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