NIOSH Publication No. 2005-151:

NIOSH Pocket Guide to Chemical Hazards

September 2005

o-Chlorobenzylidene malononitrile

CAS
2698-41-1

ClC6H4CH=C(CN)2

RTECS
OO3675000
Synonyms & Trade Names

2-Chlorobenzalmalonitrile, CS, OCBM
DOT ID & Guide
2810 / 153

Exposure
Limits

NIOSH REL: C 0.05 ppm (0.4 mg/m3) [skin]
OSHA PEL: TWA 0.05 ppm (0.4 mg/m3)
IDLH
2 mg/m3 See: 2698411
Conversion
1 ppm = 7.71 mg/m3
Physical Description
White crystalline solid with a pepper-like odor.
MW: 188.6
BP: 590-599°F
MLT: 203-205°F
Sol: Insoluble
VP: 0.00003 mmHg
IP: ?

Sp.Gr: ?
Fl.P: ?
UEL: ?
LEL: ?
MEC: 25 g/m3
Combustible Solid
Incompatibilities & Reactivities

Strong oxidizers
Measurement Methods
NIOSH P&CAM304 (II-5)
See: NMAM or OSHA Methods
Personal Protection & Sanitation
(See protection)
Skin: Prevent skin contact
Eyes: Prevent eye contact
Wash skin: When contaminated/Daily
Remove: When wet or contaminated
Change: Daily

First Aid
(See procedures)
Eye: Irrigate immediately
Skin: Soap wash immediately
Breathing: Respiratory support
Swallow: Medical attention immediately
Respirator Recommendations
NIOSH/OSHA
Up to 2 mg/m3:
(APF = 25) Any supplied-air respirator operated in a continuous-flow mode
(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.
(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
Exposure Routes
inhalation, skin absorption, ingestion, skin and/or eye contact
Symptoms
Pain, burn eyes, lacrimation (discharge of tears), conjunctivitis; erythema (skin redness) eyelids, blepharospasm; irritation throat, cough, chest tightness; headache; erythema (skin redness), skin vesiculation
Target Organs
Eyes, skin, respiratory system
See also: INTRODUCTION