NIOSH Publication No. 2005-151:

NIOSH Pocket Guide to Chemical Hazards

September 2005

Methyl acrylate

CAS
96-33-3

CH2=CHCOOCH3

RTECS
AT2800000
Synonyms & Trade Names

Methoxycarbonylethylene, Methyl ester of acrylic acid, Methyl propenoate
DOT ID & Guide
1919 / 129P (inhibited)

Exposure
Limits

NIOSH REL: TWA 10 ppm (35 mg/m3) [skin]
OSHA PEL: TWA 10 ppm (35 mg/m3) [skin]
IDLH
250 ppm See: 96333
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, 2552; OSHA 92
See: NMAM or OSHA Methods
Personal Protection & Sanitation
(See protection)
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
Important additional information about respirator selection
Exposure Routes
inhalation, skin absorption, ingestion, skin and/or eye contact
Symptoms
Irritation eyes, skin, upper respiratory system
Target Organs
Eyes, skin, respiratory system
See also: INTRODUCTION   See ICSC CARD: 0625