# NIOSH Pocket Guide to Chemical Hazards
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 | 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)
Personal Protection & Sanitation 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 a high-efficiency particulate filter/(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 a high-efficiency particulate filter/Any appropriate escape-type, self-contained breathing apparatus
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