Methyl methacrylate

  • Methyl 2-methyl-2-propenoate
  • Methacrylic acid, methyl ester
Formula
C5H8O2
Structure
Description
Clear, colorless liquid with a fragrant, fruity or pungent, acrid odor.
Uses
Monomer for polymethacrylate resins, impregnation of concrete.

Registry Numbers and Inventories.
CAS
80-62-6
EC (EINECS/ELINCS)
201-297-1
EC Index Number
607-035-00-6
EC Class
Highly flammable; Irritant; Sensitising
R 11 37/38 43
S 24 37 46
RTECS
OZ5075000
RTECS class
Tumorigen; Mutagen; Reproductive Effector; Human Data; Primary Irritant
UN (DOT)
1247
Merck
12,6005
Beilstein/Gmelin
605459
Beilstein Reference
4-02-00-01519
RCRA
U162
Swiss Giftliste 1
G-2514
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
C5H8O2
Formula mass
100.12
Melting point, °C
-48
Boiling point, °C
100
Vapor pressure, mmHg
39 (25 C)
Vapor density (air=1)
3.6
Saturation Concentration
3.8% at 20 C
Evaporization number
3.1 (butyl acetate = 1)
Odor Threshold Odor threshold 0.05 ppm
Critical temperature
294
Critical pressure
33
Density
0.9491 g/cm3 (15 C)
Solubility in water
15.9 g/L (20 C)
Viscosity
0.63 cp (20 C)
Surface tension
28.5 g/s2 (20 C)
Refractive index
1.4168 (15.6 C)
Dipole moment
1.67 D
Dielectric constant
2.9
Partition coefficient, pKow
1.38
Heat of vaporization
32.28 kJ/mol
Heat of combustion
-2704 kJ/mol

Hazards and Protection.
Storage
Keep away from heat, sparks, and flame. Keep from contact with oxidizing materials. Store in a cool, dry, well-ventilated area away from incompatible substances. After opening, purge container with nitrogen before reclosing. Periodically test for peroxide formation on long-term storage. Addition of water or appropriate reducing materials will lessen peroxide formation.
B2 D2B F
Handling
Wash thoroughly after handling. Remove contaminated clothing and wash before reuse. Use with adequate ventilation. Ground and bond containers when transferring material. Avoid contact with skin and eyes. Empty containers retain product residue, (liquid and/or vapor), and can be dangerous. Keep container tightly closed. Avoid ingestion and inhalation. If peroxide formation is suspected, do not open or move container. Do not pressurize, cut, weld, braze, solder, drill, grind, or expose empty containers to heat, sparks or open flames.
Protection
Eyes: Wear appropriate protective eyeglasses or chemical safety goggles as described by OSHA's eye and face protection regulations in 29 CFR 1910.133 or European Standard EN166. Skin: Wear appropriate protective gloves to prevent skin exposure. Clothing: Wear appropriate protective clothing to prevent skin exposure.
Respirators
A half-face organic vapor respirator may be worn for up to ten times the exposure limit, or the maximum use concentration specified by the appropriate regulatory agency or respirator supplier, whichever is lowest. A full-face piece organic vapor respirator may be worn up to 50 times the exposure limit, or the maximum use concentration specified by the appropriate regulatory agency or respirator supplier, whichever is lowest. For emergencies or instances where the exposure levels are not known, use a full-face piece positive-pressure, air-supplied respirator.
Small spills/leaks
Absorb spill with inert material, (e.g., dry sand or earth), then place into a chemical waste container. Avoid runoff into storm sewers and ditches which lead to waterways. Clean up spills immediately, using the appropriate protective equipment. Scoop up with a nonsparking tool, then place into a suitable container for disposal. Remove all sources of ignition. Provide ventilation.
Stability
Stable at room temperature for a limited storage period.Vapors are uninhibited and may form polymers in vents, causing stoppage. Violent eruption of closed containers may occur when polymerization occurs. Polymerization may be caused by elevated temperature, oxidizers, peroxides, or sunlight.
Incompatibilities
Incompatible with polymerization catalysts (peroxides, persulfates) light, heat, nitric acid and other strong oxidizers, ammonia, amines, halogens and halogen compounds.
Decomposition
Carbon monoxide, irritating and toxic fumes and gases, carbon dioxide.

Fire.
Flash Point,°C
10
Autoignition, °C
430
Upper exp. limit, %
8.2
Lower exp. limit, %
1.7
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. Use water spray to keep fire-exposed containers cool. Vapor may cause flash fire. Water may be ineffective. Extinguishing media: For small fires, use dry chemical, carbon dioxide, water spray or alcohol-resistant foam. Water may be ineffective. For large fires, use water spray, fog or alcohol-resistant foam. Do NOT use straight streams of water
Fire potential
Flammable liquid. Contact with strong oxidizers may cause fire.
Hazards
Vapors may form explosive mixtures with air. Vapors may travel to source of ignition and flash back. Most vapors are heavier than air. They will spread along ground and collect in low or confined areas (sewers, basements, tanks). Vapor explosion hazard indoors, outdoors or in sewers. May polymerize explosively when heated or involved in a fire. Runoff to sewer may create fire or explosion hazard. Containers may explode when heated. Material is lighter than water and a fire may be spread by the use of water. May polymerize explosively when involved in a fire. Containers may explode when heated.
Combustion products
Toxic gases and vapors (such as carbon monoxide) may be released in a fire involving methyl methacrylate.
Health
2
 
Flammability
3
 
 
Reactivity
2
 

Health.
Exposure limit(s)
TLV: 100 ppm; 410 mg/m3 (as TWA) (ACGIH 1994-1995). OSHA PEL: TWA 100 ppm (410 mg/m3) NIOSH REL: TWA 100 ppm (410 mg/m3) NIOSH IDLH: 1000 ppm
Poison_Class
4
Exposure effects
Prolonged or repeated skin contact may cause sensitization dermatitis and possible destruction and/or ulceration. May cause reproductive and fetal effects. Repeated exposure may cause tingling in the extremities and other nervous system abnormalities.
   Ingestion
Harmful if swallowed. May cause diarrhea, nausea and vomiting. Swallowing produces acute systemic effects paralleling ingestion. Ingestion has been linked to liver and kidney damage.
   Inhalation
Inhalation of vapors irritates the respiratory tract. Symptoms from overexposure can include coughing, chest pain, headache, drowsiness, nausea, anorexia, irritability and narcosis. Very high levels may cause pulmonary edema and death. This material has been linked to cardiac arrest and other cardiovascular problems because of its ability to lower the blood pressure.
   Skin
Causes irritation to skin. Symptoms include redness, itching, and pain. May cause allergic skin reactions. May be absorbed through the skin.
   Eyes
Causes irritation, redness, and pain.

First aid
 
   Ingestion
Do NOT induce vomiting. If victim is conscious and alert, give 2-4 cupfuls of milk or water. Get medical aid immediately.
   Inhalation
Get medical aid immediately. Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. DO NOT use mouth-to-mouth respiration. If breathing has ceased apply artificial respiration using oxygen and a suitable mechanical device such as a bag and a mask.
   Skin
Get medical aid immediately. Immediately flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Wash clothing before reuse.
   Eyes
Immediately flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid immediately.

Transport.
UN number
1247
Response guide
Hazard class
3
Packing Group
II
 
USCG CHRIS Code
MMM
 
HS Code
2916 14 10
 
Std. Transport #
4907255
 
IMO Chemical Code
17
IMO Pollution Category
D
IMO Hazard code
S