NIOSH Pocket Guide to Chemical Hazards

Crotonaldehyde CAS 4170-30-3
CH3CH=CHCHO RTECS GP9499000
Synonyms & Trade Names
2-Butenal, beta-Methyl acrolein, Propylene aldehyde
DOT ID & Guide
1143 131P (inhibited)
Exposure
Limits
NIOSH REL: TWA 2 ppm (6 mg/m3) See Appendix C (Aldehydes)
OSHA PEL: TWA 2 ppm (6 mg/m3)
IDLH 50 ppm Conversion 1 ppm = 2.87 mg/m3
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 73F and BP at or above 100F.
Incompatibilities & Reactivities
Caustics, ammonia, strong oxidizers, nitric acid, amines [Note: Polymerization may occur at elevated temperatures, such as in fire conditions.]
Measurement Methods
NIOSH 3516; OSHA 81
Personal Protection & Sanitation
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
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
See also: INTRODUCTION