NIOSH Pocket Guide to Chemical Hazards

Ethylene thiourea

CAS 96-45-7


RTECS NI9625000
Synonyms & Trade Names
1,3-Ethylene-2-thiourea; N,N-Ethylenethiourea; ETU; 2-Imidazolidine-2-thione
DOT ID & Guide


NIOSH REL: Ca Use encapsulated form. See Appendix A
OSHA PEL: none
IDLH Ca [N.D.] See: IDLH INDEX Conversion
Physical Description
White to pale-green, crystalline solid with a faint, amine odor. [Note: Used as an accelerator in the curing of polychloroprene & other elastomers.]
MW: 102.2
BP: 446-595°F
MLT: 392°F
Sol(86°F): 2%
VP: 16 mmHg
IP: 8.15 eV

Sp.Gr: ?
Fl.P: 486°F
UEL: ?
LEL: ?

Combustible Solid
Incompatibilities & Reactivities
Measurement Methods
NIOSH 5011; OSHA 95
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

First Aid (See procedures)
Eye: Irrigate immediately
Skin: Soap wash immediately
Breathing: Respiratory support
Swallow: Medical attention immediately
Important additional information about respirator selection
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
(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
Exposure Routes inhalation, ingestion, skin and/or eye contact
Symptoms Irritation eyes; in animals: thickening of the skin; goiter; teratogenic effects; [potential occupational carcinogen]
Target Organs Eyes, skin, thyroid, reproductive system

Cancer Site [in animals: liver, thyroid & lymphatic system tumors]
See also: INTRODUCTION   See ICSC CARD: 1148