NIOSH Pocket Guide to Chemical Hazards

Methyl acrylate CAS 96-33-3
Synonyms & Trade Names
Methoxycarbonylethylene, Methyl ester of acrylic acid, Methyl propenoate
DOT ID & Guide
1919 129P (inhibited)
NIOSH REL: TWA 10 ppm (35 mg/m3) [skin]
OSHA PEL: TWA 10 ppm (35 mg/m3) [skin]
IDLH 250 ppm Conversion 1 ppm = 3.52 mg/m3
Physical Description
Colorless liquid with an acrid odor.
MW: 86.1
BP: 176°F
FRZ: -106°F
Sol: 6%
VP: 65 mmHg
IP: 9.90 eV

Sp.Gr: 0.96
Fl.P: 27°F
UEL: 25%
LEL: 2.8%

Class IB Flammable Liquid: Fl.P. below 73F and BP at or above 100F.
Incompatibilities & Reactivities
Nitrates, oxidizers such as peroxides, strong alkalis [Note: Polymerizes easily; usually contains an inhibitor such as hydroquinone.]
Measurement Methods
NIOSH 1459; OSHA 92
Personal Protection & Sanitation
Skin: Prevent skin contact
Eyes: Prevent eye contact
Wash skin: When contaminated
Remove: When wet (flammable)
Change: No recommendation
Provide: 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 100 ppm: (APF = 10) Any supplied-air respirator*
Up to 250 ppm: (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 organic vapor canister/Any appropriate escape-type, self-contained breathing apparatus
Exposure Routes inhalation, skin absorption, ingestion, skin and/or eye contact
Symptoms Irritation eyes, skin, upper respiratory system
Target Organs Eyes, skin, respiratory system