NIOSH Pocket Guide to Chemical Hazards

Heptachlor CAS 76-44-8
C10H5Cl7 RTECS PC0700000
Synonyms & Trade Names
DOT ID & Guide
2761 151 (organochlorine pesticide, solid)
NIOSH REL: Ca TWA 0.5 mg/m3 [skin] See Appendix A
OSHA PEL: TWA 0.5 mg/m3 [skin]
IDLH Ca [35 mg/m3] Conversion
Physical Description
White to light-tan crystals with a camphor-like odor. [insecticide]
MW: 373.4
BP: 293°F (Decomposes)
MLT: 203°F
Sol: 0.0006%
VP(77°F): 0.0003 mmHg
IP: ?

Sp.Gr: 1.66
Fl.P: NA

Noncombustible Solid, but may be dissolved in flammable liquids.
Incompatibilities & Reactivities
Iron, rust
Measurement Methods
NIOSH S287 (II-5); OSHA PV2029
Personal Protection & Sanitation
Skin: Prevent skin contact
Eyes: Prevent eye contact
Wash skin: When contaminated/Daily
Remove: When wet or contaminated
Change: Daily
Provide: Eyewash, Quick drench
First Aid (See procedures)
Eye: Irrigate immediately
Skin: Soap wash immediately
Breathing: Respiratory support
Swallow: Medical attention immediately
Respirator Recommendations NIOSH
At concentrations above the NIOSH REL, or where there is no REL, at any detectable concentration: (APF = 10,000) Any self-contained breathing apparatus that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode/(APF = 10,000) Any supplied-air respirator that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode in combination with an auxiliary self-contained positive-pressure breathing apparatus
Escape: (APF = 50) Any air-purifying, full-facepiece respirator (gas mask) with a chin-style, front- or back-mounted organic vapor canister having a high-efficiency particulate filter/Any appropriate escape-type, self-contained breathing apparatus
Exposure Routes inhalation, skin absorption, ingestion, skin and/or eye contact
Symptoms In animals: tremor, convulsions; liver damage; [potential occupational carcinogen]
Target Organs central nervous system, liver

Cancer Site [in animals: liver cancer]