| Agent Name |
1,3-Dichloro-5,5-dimethylhydantoin |
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| CAS Number |
118-52-5 |
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| Formula |
C5-H6-Cl2-N2-O2 |
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| Major Category |
Nitrogen Compounds |
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| Synonyms |
1,3-Dichloro-5,5'-methylhydantoin; 1,3-Dichloro-5,5-dimethyl hydantoin; 1,3-Dichloro-5,5-dimethyl-2,4-imidazolidinedione; 1,3-Dichloro-5,5-dimethylhydantoin; 1,3-Dwuchloro-5,5-dwumetylohydantoina [Polish]; 2,4-Imidazolidinedione, 1,3-dichloro-5,5-dimethyl-; DDH; Dactin; Daktin; Dantoin; Dichlorantin; Dwuchlorantyny [Polish]; Halane; Hydan; Hydan (antiseptic); Hydantoin, dichlorodimethyl-; Omchlor; [ChemIDplus] UN8027 |
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| Category |
Other Nitrogen Compounds |
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| Description |
White powder with a chlorine-like odor; [NIOSH] |
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| Sources/Uses |
Used as a chlorinating agent, for organic synthesis, and to stabilize vinyl chloride polymers; [ACGIH] Used as a disinfectant and industrial deodorant; used in water treatment and laundry bleaches; [HSDB] |
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| Comments |
Hypochlorous acid is released upon contact with water. A concentration of 10 ppm is the maximum level recommended to prevent respiratory irritation when used to sanitize swimming pools. A worker exposed to a concentration exceeding 0.2 mg/m3 complained of cough and chest discomfort. [ACGIH] |
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| Exposure Assessment |
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| Skin Designation (ACGIH) |
No |
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| TLV (ACGIH) |
0.2 mg/m3 |
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| STEL (ACGIH) |
0.4 mg/m3 |
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| PEL (OSHA) |
0.2 mg/m3 |
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| IDLH (NIOSH) |
5 mg/m3 |
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| Excerpts from Documentation for IDLHs |
Based on health considerations and acute oral toxicity data in animals [Kay 1961/62; Korolev et al. 1982], a value of about 500 mg/m3 would have been appropriate for 1,3�dichloro�5,5�dimethylhydantoin. However, the revised IDLH for 1,3�dichloro�5,5�dimethylhydantoin is 5 mg/m3 based on being 25 times the NIOSH REL and OSHA PEL of 0.2 mg/m3 (25 is an assigned protection factor for respirators and was used during the Standards Completion Program for deciding when the "most protective" respirators should be used for 1,3�dichloro�5,5�dimethylhydantoin). |
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| Odor Threshold Low |
0.01 ppm |
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| Lethal Concentration |
LCLo (rats) = 20,000 mg/m3/1H |
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| Explanatory Notes |
Odor threshold from "Quick Guide: The Electronic NIOSH Pocket Guide to Chemical Hazards"; Flash point = 346 deg F; |
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| Adverse Effects |
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| Toxic Pneumonitis |
Yes |
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| Links to Other NLM Databases |
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| Health Studies |
Human Health Effects from Hazardous Substances Data Bank: 1,3-DICHLORO-5,5-DIMETHYLHYDANTOIN
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