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1,3-Dichloro-5,5-dimethylhydantoin

Synonyms & Trade Names
Dactin, DDH, Halane
CAS No.
118-52-5
RTECS No.
MU0700000
DOT ID & Guide
Formula
C5H6Cl2N2O2
Conversion
IDLH
5 mg/m3
See: 118525
Exposure Limits
NIOSH REL
: TWA 0.2 mg/m3 ST 0.4 mg/m3
OSHA PEL
†: TWA 0.2 mg/m3
Measurement Methods

None available
See: NMAM or OSHA Methods
Physical Description
White powder with a chlorine-like odor.
MW:
197.0
BP:
?		 MLT: 270°F
Sol:
0.2%
VP:
?
IP:
?
Sp.Gr:
1.5
Fl.P:
346°F
UEL:
?
LEL:
?
Combustible Solid
Incompatibilities & Reactivities
Water, strong acids, easily oxidized materials such as ammonia salts & sulfides
Exposure Routes
inhalation, ingestion, skin and/or eye contact
Symptoms
irritation eyes, mucous membrane, respiratory system
Target Organs
Eyes, respiratory system
Personal Protection/Sanitation
(See protection codes)
Skin: Prevent skin contact
Eyes: Prevent eye contact
Wash skin: When contaminated
Remove: When wet or contaminated
Change: Daily
Provide: Eyewash
First Aid
(See procedures)
Eye: Irrigate immediately
Skin: Soap wash promptly
Breathing: Respiratory support
Swallow: Medical attention immediately
Respirator Recommendations

NIOSH/OSHA

Up to 2 mg/m3:
(APF = 10) Any supplied-air respirator

Up to 5 mg/m3:
(APF = 25) Any supplied-air respirator operated in a continuous-flow mode
(APF = 50) Any self-contained breathing apparatus with a full facepiece
(APF = 50) Any supplied-air respirator with a full facepiece

Emergency or planned entry into unknown concentrations or IDLH conditions:
(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

Escape:
(APF = 50) Any air-purifying, full-facepiece respirator (gas mask) with a chin-style, front- or back-mounted canister providing protection against the compound of concern and 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

Important additional information about respirator selection

See also: INTRODUCTION
 

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