Methyl methacrylate

Synonyms & Trade Names

Methacrylate monomer, Methyl ester of methacrylic acid, Methyl-2-methyl-2-propenoate

CAS No.

80-62-6

RTECS No.

OZ5075000

DOT ID & Guide

1247 129P(inhibited)

Formula

CH₂=C(CH₃)COOCH₃

Conversion

1 ppm = 4.09 mg/m³

IDLH

1000 ppm
See: 80626

Exposure Limits

NIOSH REL

TWA 100 ppm (410 mg/m³)

OSHA PEL

TWA 100 ppm (410 mg/m³)

Measurement Methods

NIOSH 2537;
OSHA 94
See: NMAM or OSHA Methods

Physical Description

Colorless liquid with an acrid, fruity odor.

Molecular Weight

100.1

Boiling Point

214°F

Freezing Point

-54°F

Solubility

1.5%

Vapor Pressure

29 mmHg

Ionization Potential

9.70 eV

Specific Gravity

0.94

Flash Point

(oc) 50°F

Upper Explosive Limit

8.2%

Lower Explosive Limit

1.7%

Class IB Flammable Liquid: Fl.P. below 73°F and BP at or above 100°F.

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.]

Exposure Routes

inhalation, ingestion, skin and/or eye contact

Symptoms

irritation eyes, skin, nose, throat; dermatitis

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

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

Important additional information about respirator selection

Methyl methacrylate

NIOSH REL

OSHA PEL

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