NIOSH Pocket Guide to Chemical Hazards

Methyl methacrylate CAS 80-62-6
CH2=C(CH3)COOCH3 RTECS OZ5075000
Synonyms & Trade Names
Methacrylate monomer, Methyl ester of methacrylic acid, Methyl-2-methyl-2-propenoate
DOT ID & Guide
1247 129P (inhibited)
Exposure
Limits
NIOSH REL: TWA 100 ppm (410 mg/m3)
OSHA PEL: TWA 100 ppm (410 mg/m3)
IDLH 1000 ppm Conversion 1 ppm = 4.09 mg/m3
Physical Description
Colorless liquid with an acrid, fruity odor.
MW: 100.1
BP: 214°F
FRZ: -54°F
Sol: 1.5%
VP: 29 mmHg
IP: 9.70 eV

Sp.Gr: 0.94
Fl.P(oc): 50°F
UEL: 8.2%
LEL: 1.7%

Class IB Flammable Liquid: Fl.P. below 73F and BP at or above 100F.
Incompatibilities & Reactivities
Nitrates, oxidizers, peroxides, strong alkalis, moisture [Note: May polymerize if subjected to heat, oxidizers, or ultraviolet light. Usually contains an inhibitor such as hydroquinone.]
Measurement Methods
NIOSH 2537; OSHA 94
Personal Protection & Sanitation
Skin: Prevent skin contact
Eyes: Prevent eye contact
Wash skin: When contaminated
Remove: When wet (flammable)
Change: No recommendation

First Aid (See procedures)
Eye: Irrigate immediately
Skin: Water flush promptly
Breathing: Respiratory support
Swallow: Medical attention immediately
Respirator Recommendations NIOSH/OSHA
Up to 1000 ppm: (APF = 25) Any supplied-air respirator operated in a continuous-flow mode/(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 = 25) Any powered, air-purifying respirator with organic vapor cartridge(s)/(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, skin, nose, throat; dermatitis
Target Organs Eyes, skin, respiratory system
See also: INTRODUCTION