| Agent Name |
Thiourea |
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| CAS Number |
62-56-6 |
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| Formula |
C-H4-N2-S |
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| Major Category |
Nitrogen Compounds |
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| Synonyms |
2-Thiopseudourea; 2-Thiourea; Isothiourea; Pseudothiourea; Pseudourea, 2-thio-; Sulourea; THU; Thiocarbamide; Thiocarbonic acid diamide; Thiomocovina [Czech]; Thiourea; Thiuronium; Tsizp 34; Urea, 2-thio-; Urea, thio-; beta-Thiopseudourea; Urea, 2-thio-; Urea, thio- (8CI); [ChemIDplus] UN2811 |
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| Category |
Photography |
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| Description |
White or off-white crystals or powder; [CAMEO] |
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| Sources/Uses |
Used in compounds to clean silver and copper; also used in diazo copy paper; [Kanerva, p. 1174] Used in photography (toning solution); [www.ci.tucson.az.us/arthazards/medium.html] |
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| Comments |
Thiourea (thiocarbamide) has been used as a fixative in photography and photocopying. It has also been used as a rubber and neoprene antioxidant. Photocontact dermatitis caused by thiourea has been observed in users of shoe insoles, adhesive tape, wet suits, and neoprene weather strips. Alkylated thioureas include diethylthiourea (DTU), Diphenylthiourea (DPTU), Ethylenethiourea (ETU), Dimethylthiourea (DMTU), and ethylbutylthiourea (EBTU). [Marks, 239-40] ETU is listed separately in this database. |
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| Reference Link |
Occupational allergic contact dermatitis caused by thiourea compounds |
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| Exposure Assessment |
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| Skin Designation (ACGIH) |
Not evaluated |
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| Vapor Pressure |
0.0028 mm Hg |
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| Lethal Concentration |
LC50 (rats) > 900 mg/m3/4h |
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| Adverse Effects |
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| Dermatotoxin |
Contact Dermatitis, Photoallergic |
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| IARC Carcinogen |
Not Classifiable |
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| Links to Other NLM Databases |
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| Health Studies |
Human Health Effects from Hazardous Substances Data Bank: THIOUREA
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