September 2010

NIOSH Publication Number 2010-168c

Crotonaldehyde
Synonyms & Trade Names 2-Butenal, β-Methyl acrolein, Propylene aldehyde
CAS No. 4170-30-3		RTECS No. GP9499000		DOT ID & Guide 1143 131P (inhibited)
Formula CH₃CH=CHCHO		Conversion 1 ppm = 2.87 mg/m³		IDLH 50 ppm See: 123739
Exposure Limits NIOSH REL : TWA 2 ppm (6 mg/m³) See Appendix C (Aldehydes) OSHA PEL : TWA 2 ppm (6 mg/m³)				Measurement Methods NIOSH 81
Physical Description Water-white liquid with a suffocating odor. [Note: Turns pale-yellow on contact with air.]
MW: 70.1	BP: 219°F	FRZ: -101°F	Sol: 18%	VP: 19 mmHg	IP: 9.73 eV
Sp.Gr: 0.87	Fl.P: 45°F	UEL: 15.5%	LEL: 2.1%
Class IB Flammable Liquid: Fl.P. below 73°F and BP at or above 100°F.
Incompatibilities & Reactivities Caustics, ammonia, strong oxidizers, nitric acid, amines [Note: Polymerization may occur at elevated temperatures, such as in fire conditions.]
Exposure Routes inhalation, ingestion, skin and/or eye contact
Symptoms irritation eyes, respiratory system; in animals: dyspnea (breathing difficulty), pulmonary edema, irritation skin
Target Organs Eyes, skin, respiratory system
Personal Protection/Sanitation (See protection codes) Skin: Prevent skin contact Eyes: Prevent eye contact Wash skin: When contaminated Remove: When wet (flammable) Change: No recommendation Provide: Eyewash, Quick drench				First Aid (See procedures) Eye: Irrigate immediately Skin: Water flush immediately Breathing: Respiratory support Swallow: Medical attention immediately
Respirator Recommendations NIOSH/OSHA Up to 20 ppm: (APF = 10) Any chemical cartridge respirator with organic vapor cartridge(s)* (APF = 10) Any supplied-air respirator* Up to 50 ppm: (APF = 25) Any supplied-air respirator operated in a continuous-flow mode* (APF = 25) Any powered, air-purifying respirator with organic vapor cartridge(s)* (APF = 50) Any chemical cartridge respirator with a full facepiece and organic vapor cartridge(s) (APF = 50) Any air-purifying, full-facepiece respirator (gas mask) with a chin-style, front- or back-mounted organic vapor canister (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 organic vapor canister Any appropriate escape-type, self-contained breathing apparatus Important additional information about respirator selection
See also: INTRODUCTION See ICSC CARD: 0241