# NIOSH Pocket Guide to Chemical Hazards
Heptachlor | CAS 76-44-8
C10H5Cl7 | RTECS PC0700000
Synonyms & Trade Names 1,4,5,6,7,8,8-Heptachloro-3a,4,7,7a-tetrahydro-4,7-methanoindene | DOT ID & Guide 2761 151 (organochlorine pesticide, solid)
Exposure Limits | 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 | UEL: NA | LEL: 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]
See also: INTRODUCTION