1,3-DICHLORO-5,5-DIMETHYL HYDANTOIN†

Chemical Identification
Chemical Identification
CAS # 118-52-5
Formula
 

C₅H₆Cl₂N₂O₂

Synonyms
 

Dactin; DDH; Halane

Physical Properties
Physical Properties
Physical description White powder with a chlorine-like odor.
Boiling point 212° (sublimes) Molecular weight 197.0
Freezing point/melting point 270°F Vapor pressure
Flash point 346°F Vapor density 6.8
Specific gravity 1.5 Ionization potential
Lower explosive limit (LEL) Upper explosive limit (UEL)
NFPA health rating NFPA fire rating
NFPA reactivity rating NFPA special instruction
Vapor hazard ratio (VHR)
Historical exceedance percentage
Target organs
Monitoring Methods Used by OSHA
Monitoring Methods Used by OSHA
Analyte code (IMIS no.)
Sampling group
Sampler/Sampling media
Sampling time*
 

 

Sampling volume (TWA)*
 

 

Sampling flow rate (TWA)*
 

 

Sampling volume (STEL/Peak/C)*
 

 

Sampling flow rate (STEL/Peak/C)*
 

 

Analytical method instruments
Method reference
Notes
 

 

Special requirements
 

 

* All sampling instructions above are recommended guidelines for OSHA Compliance Safety and Health Officers (CSHOs), please see the corresponding OSHA method reference for complete details.

Wipe Method
Wipe Method
Sampler/Sampling media
 

 

Bulk Method
Bulk Method
 

 

On-Site Screening Techniques
On-Site Screening Techniques
Device
Model/Type
Sampling information
(see manufacturer instructions)
Exposure Limits
Exposure Limits
OSHA PEL
8-hour TWA
(ST) STEL
(C) Ceiling
Peak
NIOSH REL
Up to 10-hour TWA
(ST) STEL
(C) Ceiling
ACGIH TLV©
8-hour TWA
(ST) STEL
(C) Ceiling
CAL/OSHA PEL
8-hour TWA
(ST) STEL
(C) Ceiling
Peak
PEL-TWA
 

0.2 mg/m³

REL-TWA
 

0.2 mg/m³

TLV-TWA
 

0.2 mg/m³ [1979]

PEL-TWA
 

0.2 mg/m³

PEL-STEL
 

 

REL-STEL
 

0.4 mg/m³

TLV-STEL
 

0.4 mg/m³ [1979]

PEL-STEL
 

0.4 mg/m³

PEL-C
 

 

REL-C
 

 

TLV-C
 

 

PEL-C
 

 

Skin notation
 

N

Skin notation
 

N

Skin notation
 

N

Skin notation
 

N

Notes:
 

See 29 CFR 1910.1000 Table Z-1.

Notes:
 

 

Notes:
 

 

Notes:
 

 

Health factors:  See NIH-NLM PubChem. IDLH
 
 

5 mg/m³

Carcinogenic classifications: Not listed Notes:
 

 

AIHA emergency response planning guidelines - ERPG-1/ERPG-2/ERPG-3:
 

 

Additional Resources and Literature References
Additional Resources and Literature References

NOAA: CAMEO Chemicals - 1,3-Dichloro-5,5-dimethylhydantoin

NIOSH: Pocket Guide to Chemical Hazards - 1,3-Dichloro-5,5-dimethylhydantoin

Literature References

 
  • ACGIH: Documentation of the Threshold Limit Values (TLVs) and Biological Exposure Indices (BEIs) - 1,3-Dichloro-5,5-dimethyl hydantoin. See annual publication for most recent information.

Last Updated Date : 12/14/2020