NIOSH Publication No. 2005-151:

NIOSH Pocket Guide to Chemical Hazards

September 2005




Synonyms & Trade Names

p,p'-DDT; Dichlorodiphenyltrichloroethane; 1,1,1-Trichloro-2,2-bis(p-chlorophenyl)ethane
DOT ID & Guide
2761 / 151


NIOSH REL: Ca TWA 0.5 mg/m3 See Appendix A
OSHA PEL: TWA 1 mg/m3 [skin]
Ca [500 mg/m3] See: 50293
Physical Description
Colorless crystals or off-white powder with a slight, aromatic odor. [pesticide]
MW: 354.5
BP: 230°F (Decomposes)
MLT: 227°F
Sol: Insoluble
VP: 0.0000002 mmHg
IP: ?

Sp.Gr: 0.99
Fl.P: 162-171°F
UEL: ?
LEL: ?

Combustible Solid
Incompatibilities & Reactivities

Strong oxidizers, alkalis
Measurement Methods
NIOSH S274 (II-3)
See: NMAM or OSHA Methods
Personal Protection & Sanitation
(See protection)
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 promptly
Breathing: Respiratory support
Swallow: Medical attention immediately
Respirator Recommendations
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
(APF = 50) Any air-purifying, full-facepiece respirator (gas mask) with a chin-style, front- or back-mounted organic vapor canister having an N100, R100, or P100 filter. Click here for information on selection of N, R, or P filters./Any appropriate escape-type, self-contained breathing apparatus
Important additional information about respirator selection
Exposure Routes
inhalation, skin absorption, ingestion, skin and/or eye contact
Irritation eyes, skin; paresthesia tongue, lips, face; tremor; anxiety, dizziness, confusion, malaise (vague feeling of discomfort), headache, lassitude (weakness, exhaustion); convulsions; paresis hands; vomiting; [potential occupational carcinogen]
Target Organs
Eyes, skin, central nervous system, kidneys, liver, peripheral nervous system

Cancer Site
[in animals: liver, lung & lymphatic tumors]
See also: INTRODUCTION   See ICSC CARD: 0034   See MEDICAL TESTS: 0065