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Formaldehyde in Your Products

It can be difficult to tell which hair products contain or can release formaldehyde. Even products that do not list formaldehyde or methylene glycol on the label, or that claim to be "formaldehyde free" or "no formaldehyde," can still expose workers to formaldehyde.

It is important to know whether salon products, such as straighteners, conditioners, and shampoos, can expose workers to formaldehyde as well as what you should do if your salon or beauty school uses these products. Products of concern might contain ingredients that are synonyms for formaldehyde or methylene glycol, such as formalin, methanal, methanediol, or formaldehyde monohydrate. Hair salon products might also contain chemicals that release formaldehyde when the product is heated, such as during flat-ironing or blow-drying. Examples of chemicals that release formaldehyde include timonacic acid, dimethoxymethane, or decamethyl-cyclopentasiloxane. More examples can be found at the bottom of this page. This list does not contain all chemicals that will release formaldehyde. Employers must be aware of all chemicals hazards in their work place and must inform workers of those hazards.

Product Labels and Material Safety Data Sheets (MSDS)

OSHA's Hazard Communication and formaldehyde standard require formaldehyde and other substances that can lead to formaldehyde exposure to be listed in two places for products: on the label on the product bottle or box and in the product's material safety data sheets (MSDSs)/safety data sheets (SDSs), which are documents that explain the health hazards of products that contain hazardous chemicals and the recommended safe practices for working with them. Knowing how to read and understand labels and MSDSs/SDSs is important to protecting worker health.

If a product contains 0.1% or more formaldehyde or releases at least 0.1ppm to 0.5ppm of it into the air, then the label must include:

  • Notice that the product contains formaldehyde.
  • Name and address of the manufacturer, importer, and/or other responsible party.
  • Notice that physical and health hazards of the product are readily available from the employer and in the SDS.

If the product can release more than 0.5ppm of formaldehyde into the air, then the label must also include:

  • A list of all product health and safety hazards.
  • The words "Potential Cancer Hazard" may be used prior to June 1, 2015.
    • After June 1, 2015 the words "May cause cancer" must be used.

OSHA recently updated the hazard communications standard. MSDSs will now be called SDSs and both may be used until June 1, 2015. After June 1, 2015 only SDSs will be accepted. SDSs will generally list the same information as MSDSs, but all information will now be presented in a common format detailed in 29 CFR 1910.1200 Appendix D [Mandatory]. The MSDS/SDS for all hair products as well as any other hazardous products used in the salon must be available to all workers. MSDSs/SDSs must have the following information:

  • Product Identification (Section 1, Identification, on SDS):
    • The name of the product used on the label or product identifier.
    • The name, address and telephone number of the chemical manufacturer, importer or other responsible party.
  • Products Hazards, which include a description of the physical and health hazards of the product (Section 2, Hazard Identification, on SDS).
  • Composition (Section 3, Composition/information on ingredients, on SDS):
    • Chemical name, common name and synonyms of all hazardous chemicals that make up 1% or more of the product.
    • Chemical name, common name and synonyms of all ingredients that can cause cancer (such as formaldehyde, if present) and make up 0.1% or more of the product.
    • Chemical name, common name and synonyms of all hazardous chemicals that can be released into the air at levels that would pose a health risk for employees (for example, 0.1 ppm for formaldehyde).
  • First aid (Section 4, First Aid Measures, on SDS).
  • Fire-fighting measures (Section 5, Fire-fighting measures on SDSs).
  • Emergency Procedures, which explain what to do in an emergency (Section 6, Accidental Release Measure, on SDS).
  • Safe storage and use (Section 7, Handling and Storage, on SDS).
  • Protective measures (such as proper ventilation and protective equipment) and exposure limits (Section 8, Exposure Controls/Personal Protection, on SDS):
    • Exposure limits adopted by OSHA; or determined by the American Conference of Governmental Industrial Hygienists (ACGIH), Threshold Limit Value (TLV).
    • Any other exposure limit used or recommended by the chemical manufacturer or importer.
  • Properties of the product (e.g., solid, liquid, solubility, vapor pressure, etc.) (Section 9, Physical and chemical properties, on SDS).
  • Chemicals to avoid, conditions to avoid, etc. (Section 10, Stability and Reactivity, on SDS).
  • Health Effects (Section 11, Toxicological information, on SDS):
    • Common ways by which people may be exposed to the product and its hazardous ingredients.
    • Notice of whether the chemical is considered a cancer causing (carcinogen) substance: listed in the National Toxicology Program (NTP) Report on Carcinogens (latest edition) or has been found to be a potential carcinogen in the International Agency for Research on Cancer (IARC) Monographs (latest edition) or by OSHA
  • Date of preparation, or revision (Section 16, Other information, on SDS).

Please note that OSHA mandates that the headers for Sections 12-15 be present but is not enforcing the contents of these sections.


OSHA has issued an updated hazard alert on formaldehyde dangers to hair salon owners and workers after new agency finding and FDA warning letter. See press release.


Name-Brand Products Containing Formaldehyde

OSHA has found that many hair smoothing products contain formaldehyde, formaldehyde dissolved in water (called methylene glycol), or other chemicals that can release formaldehyde during use. Using products that contain these substances can result in worker exposure to unsafe levels of formaldehyde.

In 2011, OSHA reported that it found that measured levels of formaldehyde exceeded the short-term exposure limit (STEL) of 2 parts per million (ppm) in three salons. In one salon, formaldehyde levels during the blow drying phase of treatment were measured at 10 ppm - five times the OSHA STEL. Federal OSHA issued additional citations to 37 salons (including beauty schools) and 9 distributers/manufacturers in Connecticut, Massachusetts, Pennsylvania, Florida, Illinois, New York, New Jersey, and Ohio during the 2011 and 2012 fiscal years.

OSHA has identified several brand-name products that contain formaldehyde or that can expose you to formaldehyde during use, even though they do not list formaldehyde on their labels or MSDSs:

Brazilian Blowout

Bottles of Brazilian Blowout Acai Smoothing Solution and Brazilian Blowout Professional Smoothing Solution must have "CAUTION" stickers on the bottles to warn users of potential exposure to formaldehyde gas and the need for precautionary measures. Formaldehyde or methylene glycol must also be prominently identified in an ingredient list on the bottle. These actions are part of a settlement reached between the distributer, GIB LLC, and the State of California that was announced on January 30, 2012.

  • Acai Professional Smoothing Solution (FDA Warning Letter)
  • Professional Brazilian Blowout Solution


  • Brasil Cacau
  • Acai Therapy


  • Keratin Complex Smoothing Therapy
    • Natural Keratin Smoothing Treatment
    • Natural Keratin Smoothing Treatment Blonde
    • Express Blow Out

Marcia Teixeira

  • Brazilian Keratin Treatment
  • Advanced Treatment
  • Chocolate Treatment
  • Soft Treatment
  • Soft Chocolate Treatment

Oregon OSHA's report on Hair Smoothing Products (PDF) and ChemRisk, LLC's journal article include the names of additional products that have been shown to contain formaldehyde.

Chemicals that Can Release Formaldehyde

Just because the name "formaldehyde" or the name methylene glycol is not on a product label or MSDS does not mean the product cannot expose workers to formaldehyde. Sometimes, manufacturers or distributors intentionally omit ingredients from labels or MSDS. There are also other names for formaldehyde, and other chemicals that can expose you to formaldehyde when the product is used. These are listed in the table below, and are subject to the same OSHA rules as formaldehyde.

Chemicals That Can Release Formaldehyde1
This table is best viewed on tablets, notebooks, or desktop computer screens.
Chemical Name


CAS Number

  • Formalin
  • Methanal
Methylene glycol
  • Methanediol
  • formalin
  • formaldehyde monohydrate
Timonacic acid thiazolidinecarboxylic acid, 1,3-thiazolidine-4-carboxylic acid 60731-25-1
  • Benzylhemiformal
  • benzyloxymethanol
  • phenylmethoxymethanol
  • Preventol D2
7a-ethyldihydro-1H, 3H,5H-oxazolo[3,4-c]oxazole
  • Bioban CS-1246
  • ethyldihydrooxazolo[3,4-c]-oxazole
  • 5-ethyl-1-aza-3,7-dioxa-bi-cyclo[3.3.0]octane
  • Mixture of:
  • 4-(2-nitrobutyl)morpholine and
  • 4,4’-(2-ethyl-2-nitro-1,3-propanediyl)bismorpholine
  • Bioban P-1487
  • Mixture of:
  • nitrobutylmorpholine and
  • ethylnitrotrimethylenedimorpholine
  • 37301-88-4
  • 2224-44-4
  • 1854-23-5
  • Bromonitrodioxane
  • Bronidox
  • Bromonitropropanediol
  • Bronopol
  • Chloroallylhexaminium chloride
  • 3-chloroallyl hexaminiumchloride
  • Dowicil 75
  • Dowicil 200
  • Quaternium 15
  • 4080-31-3
  • cis(51229-78-8)
  • Diazolidinyl urea
  • tetramethylol hydanotin urea
  • Germaben II
  • Germall II
  • Formal
  • methylal
Formaldehyde, polymer with dimethyl-2,4-imidazolidinedione
  • Dimethylhydantoin formaldehyde resin
  • DMHF
  • Dimethylol urea
  • dihydroxymethylurea
  • dimethylurea
  • urea formaldehyde
  • DMDM hydantoin
  • dimethyloldimethylhydantoin
  • 1,3-dimethylol-5,5-dimethylhydantoin
  • Glydant
  • Mixture of:
  • 1,3,5-triethylhexahydro-1,3,5-triazine
  • 1,3,5-triazine-1,3,5(2H,4H,6H) triethanol
  • Forcide 78
  • Mixture of:
  • Triethylhexahydro s-triazine and
  • trihydroxyethylhexahydro s-triazine
  • 91925-30-3
  • 7779-27-3
  • 4719-04-4
1,3,5,7-tetraazatricyclo( decane
  • Hexamethylenetetramine
  • hexamine
  • methenamine
  • Urotropine
  • Hydantoin
  • glycolylurea
  • Imidazolidinyl urea
  • bis(methylolhydantoin urea) methane
  • Euxyl K 200
  • Germall 115
  • MDM hydantoin
  • monomethyloldimethylhydanotin
  • Dantoin 685
  • MDMH
1-hydroxymethyl-5,5-dimethyl-2,4-imidazolidinedione   116-25-6
3-hydroxymethyl-5,5-dimethyl-2,4-imidazolidinedione   16228-00-5
  • N,N’methylenebis(5-methyloxazolidine)
  • Grotan OX
  • N-methylolchloracetamide
  • Grotan HD
  • Parmetol K50
  • Preventol D3
  • Preventol D5
2-(hydroxymethylamino)ethanol N-methylolethanolamine 34375-28-5
Paraformaldehyde Polyoxymethylene 30525-89-4
  • Trihydroxyethylhexahydro s-triazine
  • Grotan BK
  • KM 200
  • Tris(hydroxymethyl)nitromethane
  • trimethylolnitromethane

1Adapted From: Fyvholm, MA, Andersen, P (1993): Identification of Formaldehyde Releasers and Occurrence of Formaldehyde and Formaldehyde Releasers in Registered Chemical Products. American Journal of Industrial Medicine 24(5):533-52.

Note: This list may not include all formaldehyde releasing chemicals

*Accessibility Assistance: Contact OSHA's Directorate of Technical Support and Emergency Management at (202) 693-2300 for assistance accessing PDF materials.

All other documents, that are not PDF materials or formatted for the web, are available as Microsoft Office® formats and videos and are noted accordingly. If additional assistance is needed with reading, reviewing or accessing these documents or any figures and illustrations, please also contact OSHA's Directorate of Technical Support and Emergency Management at (202) 693-2300.

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