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Chemical Sampling Information (CSI)
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General Description

Synonyms: HMPA; Hexamethylphoric acid triamide; HEMPA; HMPT; Hexamethylphosphoramide

OSHA IMIS Code Number: H129

Chemical Abstracts Service (CAS) Registry Number: 680-31-9

NIOSH Registry of Toxic Effects of Chemical Substances (RTECS) Identification Number: TD0875000

NIOSH Pocket Guide to Chemical Hazards, Hexamethyl phosphoramide: chemical description, physical properties, potentially hazardous incompatibilities, and more

Chemical Description and Physical Properties:

colorless, mobile liquid with aromatic odor; soluble with water, alcohol, ether, and other organic liquids except high-boiling point saturated hydrocarbons
vapor pressure: 0.03 mm at room temperature
boiling point: 233°C at 760 mm
Exposure Limits

American Conference of Governmental Industrial Hygienists (ACGIH) Threshold Limit Value (TLV): (Skin); Appendix A3 (Confirmed Animal Carcinogen with Unknown Relevance to Humans)

National Institute for Occupational Safety and Health (NIOSH) Recommended Exposure Limit (REL): Potential carcinogen

Health Factors

Carcinogenic Classification:

International Agency for Research on Cancer (IARC): Group 2B, possibly carcinogenic to humans

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