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Chemical Sampling Information (CSI)
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General Description

Synonyms: Dimethylamine, anhydrous

OSHA IMIS Code Number: 0928

Chemical Abstracts Service (CAS) Registry Number: 124-40-3

NIOSH Registry of Toxic Effects of Chemical Substances (RTECS) Identification Number: IP8750000; 31609

Department of Transportation Regulation Number (49 CFR 172.101) and Guide: UN1032 Flammable Gas (Anhydrous); UN1160 Flammable Liquid (Solution)

Chemical Description and Physical Properties:
    molecular weight: 45
    boiling point: 44°F
    vapor pressure: 1.7 atm
    melting point: -134°F
Incompatibilities: Strong oxidizers, chlorine, mercury

Exposure Limits

OSHA Permissible Exposure Limit (PEL):
General Industry: 10 ppm, 18 mg/m3

Construction Industry: 10 ppm, 18 mg/m3 TWA
American Conference of Governmental Industrial Hygienists (ACGIH) Threshold Limit Value (TLV): 5 ppm, 9.2 mg/m3 TWA; 15 ppm, 27.6 mg/m3 STEL; Appendix A4 (Not Classifiable as a Human Carcinogen)

National Institute for Occupational Safety and Health (NIOSH) Recommended Exposure Limit (REL): 10 ppm TWA

Health Factors

Potential Symptoms: Nose, throat irritation; sneezing, coughing, dyspnea; pulmonary edema; conjunctivitis; burns skin, mucous membranes; dermatitis

Health Effects: Irritation-Eye, Nose, Throat, Skin---Marked (HE14) Cumulative liver, testicular damage (HE3)

Affected Organs: Respiratory system, skin, eyes

NIOSH/OSHA/DOE Health Guideline: Dimethylamine

Monitoring Methods used by OSHA

Primary Sampling/Analytical Method (SLC1):
  • sampling media: Coated XAD-7 Tube (80/40 mg sections, 20/50 mesh); Coating is 10% (w/w) NBD-Chloride.
    analytical solvent: Tetrahydrofuran
    maximum volume: 10 Liters
    maximum flow rate: 0.2 L/min
    current analytical method: High Performance Liquid Chromatography; HPLC/FLU/VIS
    method reference: 2 OSHA 34
    sampling and analytical error: 0.09
    method classification: Fully Validated
    note: OSHA personnel may obtain sampling tubes from SLTC.
Conditions: Column: Radial CN Mobile Phase:80:20 Isooctane:Water Detector Wavelength: 465 EX: 525 EM (Fluor) Detection Limit: 2.8 ng/inj

Secondry Sampling/Analytical Method (SAM2):
  • device: Detector Tube
    company: Gastec
    part #: 180
    range: 1-60 ppm
    class: Mfg
  • device: Detector Tube
    company: MSA
    part #: 92115
    range: 5-100 ppm
    class: Mfg
  • device: Instrumentation
    company: Infrared Spectrophotometer
    part #: MIRAN 1A & 1B
    range: 1.2 ppm @ 8.8 um
    class: Mfg

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Page last updated: 06/01/2006