1,3-二氯-5,5-二甲基乙内酰脲

Description

1,3-Dichloro-5,5-dimethylhydantoin · CAS 118-52-5 · C5H6Cl2N2O2. UNII 70H8B2WWTU. Melting Point: 270 °F (NTP, 1992); Melting Point: 132 °C; Melting Point: 270 °F.

Identification

CAS Registry Number	118-52-5
PubChem CID	8360
Molecular formula	C5H6Cl2N2O2
IUPAC name	1,3-dichloro-5,5-dimethylimidazolidine-2,4-dione
UNII (FDA)	70H8B2WWTU

Computed Descriptors

Molecular Weight	197.02
XLogP3	1.1
Hydrogen Bond Donor Count	0
Hydrogen Bond Acceptor Count	2
Rotatable Bond Count	0
Exact Mass	195.9806328
Monoisotopic Mass	195.9806328
Topological Polar Surface Area	40.6
Heavy Atom Count	11
Formal Charge	0

Physical & Chemical Properties

Melting Point	270 °F (NTP, 1992)
Melting Point	132 °C
Melting Point	270 °F
Flash Point	346 °F (NIOSH, 2024)
Flash Point	346 °F
Solubility	0.2%
Density	1.5 at 20 °C/20 °C
Density	1.5
Vapor Density	6.8
Vapor Pressure	0.000024 [mmHg]

Physical description & handling notes

• 1,3-dichloro-5,5-dimethylhydantoin is a white powder with a weak chlorine odor. Conflagrates at 414 °F (turns brown). Chlorine gas evolves at temperatures > 410 °F. (NTP, 1992)
• Dry Powder
• White powder with a chlorine-like odor; [NIOSH]
• White powder with a chlorine-like odor.
• Four-sided, pointed prisms from chloroform
• White powder

GHS Hazard Classification

Reported hazard statements	H272 (53.1%), H302 (100%), H314 (61.5%), H315 (38.5%), H317 (20.8%), H319 (36.9%), H334 (31.5%), H335 (38.5%)

Documented 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]
• Using Disinfectants or Biocides [Category: Clean]
• Sewer and Wastewater Treatment [Category: Industry]
• Plastic Composites Manufacturing [Category: Industry]
• Chlorinating agent, disinfectant, industrial deodorant. In water treatment. Active ingredient of powder laundry bleaches... .
• Intermediate for amino acids, drugs, insecticides. Stabilizer for vinyl chloride polymers. Polymerization catalyst.

Synonyms

1,3-DICHLORO-5,5-DIMETHYLHYDANTOIN; 118-52-5; Dantoin; Dactin; Halane; Daktin; Dichlorantin; Omchlor; Hydan; Hydantoin, dichlorodimethyl-; Hydan (antiseptic); NCI-C03054; 1,3-Dichloro-5,5-dimethyl-2,4-imidazolidinedione; Dwuchlorantyny; 2,4-Imidazolidinedione, 1,3-dichloro-5,5-dimethyl-; DCDMH

Frequently Asked Questions

What are the CAS number and molecular formula of 1,3-Dichloro-5,5-dimethylhydantoin?

CAS 118-52-5; molecular formula C5H6Cl2N2O2; molecular weight — g/mol.

What other names is 1,3-Dichloro-5,5-dimethylhydantoin known by?

1,3-DICHLORO-5,5-DIMETHYLHYDANTOIN, 118-52-5, Dantoin, Dactin, Halane, Daktin.

Is 1,3-Dichloro-5,5-dimethylhydantoin classified as hazardous?

Hazard statements reported: H272, H302, H314, H315, H317.

What are the key physical properties of 1,3-Dichloro-5,5-dimethylhydantoin?

Melting Point: 270 °F (NTP, 1992); Melting Point: 132 °C; Melting Point: 270 °F; Flash Point: 346 °F (NIOSH, 2024).

Facts on this page are taken from PubChem (US National Library of Medicine) and Wikidata. Grade-specific data — assay, moisture, particle size, packaging, shelf life — is issued per batch on the COA and is not published here.