NIOSH Pocket Guide to Chemical Hazards

Methoxychlor CAS 72-43-5
(C6H4OCH3)2CHCCl3 RTECS KJ3675000
Synonyms & Trade Names
p,p'-Dimethoxydiphenylftrichloroethane; DMDT; Methoxy-DDT; 2,2-bis(p-Methoxyphenyl)-1,1,1-trichloroethane; 1,1,1-Trichloro-2,2-bis-(p-methoxyphenyl)ethane
DOT ID & Guide
2761 151 (organochlorine pesticide, solid, n.o.s.)
NIOSH REL: Ca See Appendix A
OSHA PEL†: TWA 15 mg/m3
IDLH Ca [5000 mg/m3] Conversion
Physical Description
Colorless to light-yellow crystals with a slight, fruity odor. [insecticide]
MW: 345.7
BP: Decomposes
MLT: 171°F
Sol: 0.00001%
VP: Very low
IP: ?

Sp.Gr: 1.41
Fl.P: ?
UEL: ?
LEL: ?

Combustible Solid, but difficult to burn.
Incompatibilities & Reactivities
Measurement Methods
NIOSH S371 (II-4); OSHA PV2038
Personal Protection & Sanitation
Skin: Prevent skin contact
Eyes: No recommendation
Wash skin: When contaminated/Daily
Remove: When wet or contaminated
Change: Daily

First Aid (See procedures)

Skin: Soap wash
Breathing: Fresh air
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, ingestion
Symptoms In animals: fasciculation, trembling, convulsions; kidney, liver damage; [potential occupational carcinogen]
Target Organs central nervous system, liver, kidneys

Cancer Site [in animals: liver & ovarian cancer]