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methylacrylate(CAS No. 96-33-3)

methylacrylate C4H6O2 (cas 96-33-3) Molecular Structure

96-33-3 Structure

Identification and Related Records

【Name】
methylacrylate
【CAS Registry number】
96-33-3
【Synonyms】
2-Propenoic Acid Methyl Ester
Acrylic Acid Methyl Ester
curithane 103
Methoxycarbonylethylene
methyl 2-propenoate
methyl acrylate
Methyl acrylate? Methyl acrylate, stabilized with 200 ppm MEHQ
methyl ester acrylic acid
methyl propenoate
propenoic acid methyl ester
[sri773]methylacrylate,monomer
2-Propenoicacidmethylesetr
Acrylate de methyle
acrylatedemethyle
acrylatedemethyle(french)
Acrylsaeuremethylester
CH2=CHCOOCH3
【EINECS(EC#)】
202-500-6
【Molecular Formula】
C4H6O2 (Products with the same molecular formula)
【Molecular Weight】
86.09
【Inchi】
InChI=1/C4H6O2/c1-3-4(5)6-2/h3H,1H2,2H3
【InChIKey】
BAPJBEWLBFYGME-UHFFFAOYSA-N
【MOL File】
96-33-3.mol

Chemical and Physical Properties

【Appearance】
colourless liquid
【Density】
0.956
【Melting Point】
-75℃
【Boiling Point】
80℃
【Refractive Index】
1.401-1.404
【Flash Point】
-3℃
【Water】
60 g/L (20℃)
【Solubilities】
60 g/L (20 oC) in waterSoluble in ether and alcohol
【Color/Form】
Colorless volatile liquid
【Stability】
Stable. Incompatible with bases, acids, oxidizing agents, peroxides. May polymerize on exposure to light. Highly flammable. Commercial product may be inhibited by the presence of hydroquinone monomethyl ether.
【Storage temp】
Refrigerator (+4°C) + Flammables area
【Spectral properties】
Index of refraction: 1.4040 at 20 deg C/D
IR: 4304 (Coblentz Society Spectral Collection)
1H NMR: 64 (Varian Associates NMR Spectra Catalogue)
Raman: 100 (Sadtler Research Laboratories spectral collection)
MASS: 2719 (NIST/EPA/MSDC Mass Spectral Database, 1990 version)
【Computed Properties】
Molecular Weight:86.08924 [g/mol]
Molecular Formula:C4H6O2
XLogP3:0.8
H-Bond Donor:0
H-Bond Acceptor:2
Rotatable Bond Count:2
Exact Mass:86.036779
MonoIsotopic Mass:86.036779
Topological Polar Surface Area:26.3
Heavy Atom Count:6
Formal Charge:0
Complexity:65.9
Isotope Atom Count:0
Defined Atom Stereocenter Count:0
Undefined Atom Stereocenter Count:0
Defined Bond Stereocenter Count:0
Undefined Bond Stereocenter Count:0
Covalently-Bonded Unit Count:1
Feature 3D Acceptor Count:1
Feature 3D Hydrophobe Count:1
Effective Rotor Count:2
Conformer Sampling RMSD:0.4
CID Conformer Count:3

Safety and Handling

【Hazard Codes】
F:Flammable
【Risk Statements】
R11;R20/21/22;R36/37/38;R43
【Safety Statements 】
S25;S26;S33;S36/37;S43;S9
【HazardClass】
3
【PackingGroup 】
II
【Skin, Eye, and Respiratory Irritations】
The substance is irritating to the skin and the respiratory tract , and is severely irritating to the eyes .
【Cleanup Methods】
SRP: Wastewater from contaminant suppression, cleaning of protective clothing/equipment, or contaminated sites should be contained and evaluated for subject chemical or decomposition product concentrations. Concentrations shall be lower than applicable environmental discharge or disposal criteria. Alternatively, pretreatment and/or discharge to a permitted wastewater treatment facility is acceptable only after review by the governing authority and assurance that "pass through" violations will not occur. Due consideration shall be given to remediation worker exposure (inhalation, dermal and ingestion) as well as fate during treatment, transfer and disposal. If it is not practicable to manage the chemical in this fashion, it must be evaluated in accordance with EPA 40 CFR Part 261, specifically Subpart B, in order to determine the appropriate local, state and federal requirements for disposal.
Spill Handling: Evacuate and restrict persons not wearing protective equipment from area of spill or leak until cleanup is complete. Remove all ignition sources. Establish forced ventilation to keep levels below explosive limit. Absorb liquids in vermiculite, dry sand, earth, peat, carbon, or a similar material and deposit in sealed containers. Keep this chemical out of a confined space, such as a sewer, because of the possibility of an explosion, unless the sewer is designed to prevent the build-up of explosive concentrations. It may be necessary to contain and dispose of this chemical as a hazardous waste. If material or contaminated runoff enters waterways, notify downstream users of potentially contaminated waters.
Eliminate all igntion sources. Stop or control the leak, if this can be done without undue risk. Use water spray to cool and disperse vapors and protect personnel. Control runoff and isolate discharged material for proper disposal. /Methyl acrylate, inhibited/
For small quantities, absorb on paper towels. Evaporate in safe place (such as fume hood). Allow sufficient time for evaporating vapors to completely clear hood ductwork. Burn paper in suitable location away from combustible materials. Large quantities can be collected & atomized in suitable combustion chamber. Methyl acrylate should not be allowed to enter a confined space, such as a sewer, because of possibility of an explosion.
【Transport】
UN 1919
【Fire Fighting Procedures】
Use water spray, dry chemical, foam, or carbon dioxide. Use water spray to keep fire-exposed containers cool. Fight fire from protected location or maximum possible distance. /Methyl acrylate, inhibited/
Use dry chemical, carbon dioxide, or alcohol foam extinguishers. Vapors are heavier than air and will collect in low areas. Vapors may travel long distances to ignition sources and flashback. Vapors in confined areas may explode when exposed to fire. Containers may explode in fire. Storage containers and parts of containers may rocket great distances, in many directions. If material or contaminated runoff enters waterways, notify downstream users of potentially contaminated waters. Notify local health and fire officials and pollution control agencies. From a secure, explosion-proof location, use water spray to cool exposed containers. If cooling streams are ineffective (venting sound increases in volume and pitch, tank discolors or shows any signs of deforming), withdraw immediately to a secure position.
Inhibitors do not function in absence of air, so inert gas blankets should not be used.
Do not extinguish fire unless flow can be stopped. Use water in flooding quantities as fog. Solid stream of water may spread fire. Cool all affected containers with flooding quantities of water. Apply water from as far a distance as possible. Use alcohol foam, dry chemical or carbon dioxide. /Methyl acrylate, stabilized/
Evacuation: If fire becomes uncontrollable or container is exposed to direct flame - consider evacuation of one-half (1/2) mile radius. If material leaking (not on fire) consider evacuation from downwind area based on amount of material spilled, location, and weather conditions. /Methyl acrylate, stabilized/
【Fire Potential】
Flammable liquid
Dangerously flammable when exposed to heat, flame, or oxidizers .
【DOT Emergency Guidelines】
/GUIDE 129P: FLAMMABLE LIQUIDS (POLAR/WATER-MISCIBLE/NOXIOUS)/ Fire or Explosion: HIGHLY FLAMMABLE: Will be easily ignited by heat, sparks or flames. 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 confined areas (sewers, basements, tanks). Vapor explosion hazard indoors, outdoors or in sewers. Those substances designated with "P" may polymerize explosively when heated or involved in a fire. Runoff to sewer may create fire or explosion hazard. Containers may explode when heated. Many liquids are lighter than water. /Methyl acrylate, stabilized/
/GUIDE 129P: FLAMMABLE LIQUIDS (POLAR/WATER-MISCIBLE/NOXIOUS)/ Health: May cause toxic effects if inhaled or absorbed through skin. Inhalation or contact with material may irritate or burn skin and eyes. Fire will produce irritating, corrosive and/or toxic gases. Vapors may cause dizziness or suffocation. Runoff from fire control or dilution water may cause pollution. /Methyl acrylate, stabilized/
/GUIDE 129P: FLAMMABLE LIQUIDS (POLAR/WATER-MISCIBLE/NOXIOUS)/ Public Safety: CALL Emergency Response Telephone Number ... As an immediate precautionary measure, isolate spill or leak area for at least 50 meters (150 feet) in all directions. Keep unauthorized personnel away. Stay upwind. Keep out of low areas. Ventilate closed spaces before entering. /Methyl acrylate, stabilized/
/GUIDE 129P: FLAMMABLE LIQUIDS (POLAR/WATER-MISCIBLE/NOXIOUS)/ Protective Clothing: Wear positive pressure self-contained breathing apparatus (SCBA). Structural firefighters' protective clothing will only provide limited protection. /Methyl acrylate, stabilized/
/GUIDE 129P: FLAMMABLE LIQUIDS (POLAR/WATER-MISCIBLE/NOXIOUS)/ Evacuation: Large spill: Consider initial downwind evacuation for at least 300 meters (1000 feet). Fire: If tank, rail car or tank truck is involved in a fire, ISOLATE for 800 meters (1/2 mile) in all directions; also, consider initial evacuation for 800 meters (1/2 mile) in all directions. /Methyl acrylate, stabilized/
/GUIDE 129P: FLAMMABLE LIQUIDS (POLAR/WATER-MISCIBLE/NOXIOUS)/ Fire: Caution: All these products have a very low flash point: Use of water spray when fighting fire may be inefficient. Small fires: Dry chemical, CO2, water spray or alcohol-resistant foam. Do not use dry chemical extinguishers to control fires involving nitromethane or nitroethane. Large fires: Water spray, fog or alcohol-resistant foam. Do not use straight streams. Move containers from fire area if you can do it without risk. Fire involving tanks or car/trailer loads: Fight fire from maximum distance or use unmanned hose holders or monitor nozzles. Cool containers with flooding quantities of water until well after fire is out. Withdraw immediately in case of rising sound from venting safety devices or discoloration of tank. ALWAYS stay away from tanks engulfed in fire. For massive fire, use unmanned hose holders or monitor nozzles; if this is impossible, withdraw from area and let fire burn. /Methyl acrylate, stabilized/
/GUIDE 129P: FLAMMABLE LIQUIDS (POLAR/WATER-MISCIBLE/NOXIOUS)/ Spill or Leak: ELIMINATE all ignition sources (no smoking, flares, sparks or flames in immediate area). All equipment used when handling the product must be grounded. Do not touch or walk through spilled material. Stop leak if you can do it without risk. Prevent entry into waterways, sewers, basements or confined areas. A vapor suppressing foam may be used to reduce vapors. Absorb or cover with dry earth, sand or other non-combustible material and transfer to containers. Use clean non-sparking tools to collect absorbed material. Large spills: Dike far ahead of liquid spill for later disposal. Water spray may reduce vapor; but may not prevent ignition in closed spaces. /Methyl acrylate, stabilized/
/GUIDE 129P: FLAMMABLE LIQUIDS (POLAR/WATER-MISCIBLE/NOXIOUS)/ First Aid: Move victim to fresh air. Call 911 or emergency medical service. Give artificial respiration if victim is not breathing. Administer oxygen if breathing is difficult. Remove and isolate contaminated clothing and shoes. In case of contact with substance, immediately flush skin or eyes with running water for at least 20 minutes. Wash skin with soap and water. Keep victim warm and quiet. In case of burns, immediately cool affected skin for as long as possible with cold water. Do not remove clothing if adhering to skin. Effects of exposure (inhalation, ingestion or skin contact) to substance may be delayed. Ensure that medical personnel are aware of the material(s) involved and take precautions to protect themselves. /Methyl acrylate, stabilized/
【Exposure Standards and Regulations】
Homopolymers and copolymers of methyl acrylate are an indirect food additive for use only as a component of adhesives.
【Reactivities and Incompatibilities】
Contact with nitrates and other oxidizing materials, incl peroxides and other initiators of polymerization, strong alkalies, and atmospheric moisture may cause fires & explosions.
Nitrates, oxidizers such as peroxides, strong alkalis [Note: Polymerizes easily; usually contains an inhibitor such as hydroquinone].
【Other Preventative Measures】
SRP: The scientific literature for the use of contact lenses by industrial workers is inconsistent. The benefits or detrimental effects of wearing contact lenses depend not only upon the substance, but also on factors including the form of the substance, characteristics and duration of the exposure, the uses of other eye protection equipment, and the hygiene of the lenses. However, there may be individual substances whose irritating or corrosive properties are such that the wearing of contact lenses would be harmful to the eye. In those specific cases, contact lenses should not be worn. In any event, the usual eye protection equipment should be worn even when contact lenses are in place.
SRP: Contaminated protective clothing should be segregated in a manner that results in no direct personal contact by personnel who handle, dispose of, or clean the clothing. Quality assurance procedures to confirm the efficacy of the cleaning procedures should be implemented prior to the decontaminated protective clothing being returned for reuse by the workers. Contaminated clothing (including shoes/socks) should not be taken home at end of shift, but should remain at employee's place of work for cleaning.
Any clothing which becomes wet with liquid methyl acrylate should be removed immediately and not reworn until the methyl acrylate is removed from the clothing. ... Employees who handle liquid methyl acrylate should wash their hands thoroughly before eating or smoking.
Immediately remove any clothing that becomes wet to avoid flammability hazard. The quick drench should be available.
Clothing wet with liquid methyl acrylate should be placed in closed containers for storage until it can be discarded or until provision is made for the removal of methyl acrylate or otherwise cleaned to remove the methyl acrylate, the person performing the operation should be informed of methyl acrylate's hazardous properties.
Contact lenses should not be worn when working with this chemical.
In material not on fire and not involved in fire: Keep sparks, flames, and other sources of ignition away. Keep material out of water sources and sewers. Build dikes to contain flow as necessary. Attempt to stop leak if without undue personnel hazard. Use water spray to disperse vapors and dilute standing pools of liquid. /Methyl acrylate, stabilized/
Personnel protection: Avoid breathing vapors. Keep upwind. ... Do not handle broken packages unless wearing appropriate personal protective equipment. Wash away any material which may have contacted the body with copious amt of water or soap and water. /Methyl acrylate, stabilized/
The worker should immediately wash the skin when it becomes contaminated.
Work clothing that becomes wet should be immediately removed due to its flammability hazard (i.e., for liquids with a flash point
【Protective Equipment and Clothing】
Employees should be provided with and required to use impervious clothing, gloves, face shields (eight-inch minimum), and other appropriate protective clothing necessary to prevent any possibility of skin contact with liquid methyl acrylate.
Employees should be provided with and required to use splash-proof safety goggles where liquid methyl acrylate may contact the eyes.
Wear appropriate personal protective clothing to prevent skin contact.
Wear appropriate eye protection to prevent eye contact.
Facilities for quickly drenching the body should be provided within the immediate work area for emergency use where there is a possibility of exposure. [Note: It is intended that these facilities should provide a sufficient quantity or flow of water to quickly remove the substance from any body areas likely to be exposed. The actual determination of what constitutes an adequate quick drench facility depends on the specific circumstances. In certain instances, a deluge shower should be readily available, whereas in others, the availability of water from a sink or hose could be considered adequate.]
Respirator Recommendations: Up to 100 ppm: Assigned Protection Factor (APF) Respirator Recommendation APF = 10 Any supplied-air respirator. Substance reported to cause eye irritation or damage; may require eye protection.
Respirator Recommendations: Up to 250 ppm: Assigned Protection Factor (APF) Respirator Recommendation APF = 25 Any supplied-air respirator operated in a continuous-flow mode. Substance reported to cause eye irritation or damage; may require eye protection. APF = 50 Any self-contained breathing apparatus with a full facepiece. APF = 50 Any supplied-air respirator with a full facepiece.
Respirator Recommendations: Emergency or planned entry into unknown concentrations or IDLH conditions: Assigned Protection Factor (APF) Respirator Recommendation 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.
Respirator Recommendations: Escape conditions: Assigned Protection Factor (APF) Respirator Recommendation 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.
【Octanol/Water Partition Coefficient】
log Kow = 0.80
【Disposal Methods】
SRP: The most favorable course of action is to use an alternative chemical product with less inherent propensity for occupational harm/injury/toxicity or environmental contamination. Recycle any unused portion of the material for its approved use or return it to the manufacturer or supplier. Ultimate disposal of the chemical must consider: the material's impact on air quality; potential migration in soil or water; effects on animal and plant life; and conformance with environmental and public health regulations.
1. By absorbing it in vermiculite, dry sand, earth or a similar material and disposing in a secured sanitary landfill in an area where odor will not be objectionable. 2. By atomizing in suitable combustion chamber.

Use and Manufacturing

【Sampling Procedures】
NIOSH S38: ANALYTE: METHYL ACRYLATE; MATRIX: AIR; PROCEDURE: ADSORPTION ON CHARCOAL

Biomedical Effects and Toxicity

【Biomedical Effects and Toxicity】
It is readily absorbed by mucous membranes and through the intact skin.
Whole-body autoradiology was performed in the guinea pigs with 2,3-(14)C-labeled methyl acrylate. 2,3-(14)C-methyl acrylate quickly disappeared from guinea pigs after oral and, somewhat slower, after ip admin. After admin in a closed cup on skin a slow penetration in dermis occurred. Internal organs showed a slow rise in radioactivity. [Seutter E, Rijntjes NV; Arch Dermatol Res 270 (3): 273-84 (1981)] PubMed Abstract
Organ damage was observed in test animals when they were exposed to methyl and ethyl acrylate and methyl methacrylate vapors. This shows that acrylate compounds are absorbed from the lungs. Ethyl acrylate vapor was efficiently absorbed from the lungs of the rat (63% on an average); the proportion retained was the same at different concentration levels up to 1000 mg/cu m.
When guinea pigs were given radioactively labeled methyl acrylate intraperitoneally, about 35% of the dose was excreted in expired air as carbon dioxide in 3 days; the main part during the first few hours. Almost an equal proportion of the given dose was excreted in urine as thioethers in 3 days after administration.
Autoradiography of guinea-pigs exposed dermally to methyl 2,3-(14)C-acrylate showed that the radioactivity was seen in the subcutaneous tissues and throughout the body. Following oral administration of methyl 2,3-(14)C-acrylate to guinea-pigs, the radioactivity was distributed in internal organs, especially the liver and bladder, and brain within 2 hr; at 16 hr it was seen only in mucous linings of the stomach, intestine and mouth epithelium. One hour after intraperitoneal injection of the same dose (no vehicle), radioactivity was concentrated in the peritoneum and liver and present in most other organs. Radioactivity quickly decreased in most organs, except the liver and bladder. After 24 and 48 hr most organs had lost the radioactive material, but some was retained in mucous linings. After an intraperitoneal dose of methyl 2,3-(14)C-acrylate to young male guinea-pigs, 35% of the radioactivity was excreted as (14)CO2 in expired air within 8 hr and 40% after 72 hr (22.6% was excreted in the urine over 72 hr)
After oral administration of 34 mg/kg bw methyl acrylate, 11% was excreted as urinary thioether during the first 24 hr period, 2.5% during the second 24 hr period, and 0.3% during the third. Following intraperitoneal administration (without a vehicle), these values were 16.5%, 10.7%, and 2.8%, respectively.
A group of six male Wistar albino rats was given a single oral dose of 100 mg/kg methyl 2,3-(14)C-acrylate (specific activity 3.7 MBq/kg) in soybean oil ... Within 24 hours, 38.6% of the radioactivity was excreted in expired air; most of it was exhaled within 2 hours. A total of 51.2% of the dose was excreted in the urine in 48 hours (38.0% of it was excreted in 24 hours ), whereas only 1.5% of the dose was excreted in the feces in 72 hours. Total excretion in 72 hours was 91.3%. [Zondlo Fiume M; Int J Toxicol 21 (Suppl 3): 1-50 (2002). Available from, as of March 3, 2010:] PubMed Abstract
Two hours after oral administration of methyl 2,3-(14)C-acrylate to guinea pigs, the radioactivity was distributed in internal organs, especially the liver and bladder, and in the brain. [Zondlo Fiume M; Int J Toxicol 21 (Suppl 3): 1-50 (2002). Available from, as of March 3, 2010:] PubMed Abstract
The distribution of (14)C-labeled methyl acrylate was examined in rats after oral and intraperitoneal administration. The radioactivity was rapidly eliminated in each case: more than 50% was exhaled; 10 to 50% was excreted in urine. Shortly after the substance was administered, radioactivity was found mainly in the liver, kidney and lung. /Translated from German/
Methyl acrylate at a dose of 12 mg/kg was administered ip to female Wistar rats, either once or 5 times a week for 3 weeks. Relative to controls, there was an increased excretion of thioethers (6.6% of appl. dose) in the form of N-acetyl-S-(2-carboxyethyl) cysteine in urine. Pretreatment of the animals with the carboxylesterase inhibitor tri-o-tolyl phosphate (TOTP) 18 hours prior to methyl acrylate administration led to a significant increase in the thioether (40.6% of appl. dose) in urine. /Translated from German/
The intraperitoneal administration of 0.14 or 0.50 mmol/ kg of methyl acrylate to rats led to the formation of thioethers which were detected in the urine. Two different mercapturic acids were observed, one formed from a Michael addition of glutathione and methyl acrylate and the other was the ester hydrolysis product of mercapturic acid. /Translated from German/
The disposition of methyl [2,3-14C]-acrylate (MA) and 2-ethylhexyl [2,3-14C]-acrylate (EHA) following intraperitoneal and oral administration to rats has been studied. The carbon-14 found in the tissues was mainly associated with liver, kidneys and lungs. Loss of carbon-14 from these tissues occurred fairly rapidly, excluding the rats given EHA intraperitoneally. Most of the administered acrylates underwent rapid metabolism and excretion with expired air (more than 50% of the dose and urine (10-50% of the dose). Significant differences in the rates of 14C loss from tissues and excretion occurred after intraperitoneal administration of MA and EHA. A possible cumulation of EHA in the organism was suggested. [Sapota A; Arch Toxicol 62 (2-3): 181-4 (1988). Available from, as of March 2, 1010:] PubMed Abstract
Whole-body autoradiography was performed in the guinea pig with methyl (2,3-14C)-acrylate. Radioactive material quickly disappeared from the body after oral and, somewhat slower, after ip administration for the greater part. After administration in a closed cup on the skin a slow penetration in the dermis occurred preceded by the toxic effect, mainly a strong edema. In the first 16 h metabolism was primarily restricted to the skin, internal organs showed a slow rise in radioactivity. A large part of the labeled material was retained in the dermis. The detoxification was screened by estimating the urinary thioether content and respiratory carbon dioxide. This showed that in addition to oxidation to carbon dioxide the binding to SH-groups was the principal way of metabolism. [Seutter E, Rijntjes NV; Arch Dermatol Res 270 (3): 273-84 (1981). Available from, as of March 2, 1010:] PubMed Abstract

Environmental Fate and Exposure Potential

【Environmental Fate/Exposure Summary】
TERRESTRIAL FATE: Based on a classification scheme(1), an estimated Koc value of 6(SRC), determined from a structure estimation method(2), indicates that methyl acrylate is expected to have very high mobility in soil(SRC). Volatilization of methyl acrylate from moist soil surfaces is expected to be an important fate process(SRC) given an estimated Henry's Law constant of 2.0X10-4 atm-cu m/mole(SRC), based upon its vapor pressure, 86.6 mm Hg(3), and water solubility, 4.94X10+4 mg/L(4). Methyl acrylate is expected to volatilize from dry soil surfaces(SRC) based upon its vapor pressure(3). Utilizing the Japanese MITI test, 37% of the Theoretical BOD was reached in 2 weeks indicating that biodegradation is an important environmental fate process(5).
AQUATIC FATE: Based on a classification scheme(1), an estimated Koc value of 6(SRC), determined from a structure estimation method(2), indicates that methyl acrylate is not expected to adsorb to suspended solids and sediment(SRC). Volatilization from water surfaces is expected(3) based upon an estimated Henry's Law constant of 2.0X10-4 atm-cu m/mole(SRC), derived from its vapor pressure, 86.6 mm Hg(4), and water solubility, 4.94X10+4 mg/L(5). Using this Henry's Law constant and an estimation method(3), volatilization half-lives for a model river and model lake are 7 hours and 5 days, respectively(SRC). According to a classification scheme(6), an estimated BCF of 3(SRC), from its log Kow of 0.80(7) and a regression-derived equation(8), suggests the potential for bioconcentration in aquatic organisms is low(SRC). Methyl acrylate is not expected to undergo hydrolysis in the environment since esters hydrolyze but only under basic conditions(3). Utilizing the Japanese MITI test, 37% of the Theoretical BOD was reached in 2 weeks indicating that biodegradation is an important environmental fate process(9).
ATMOSPHERIC FATE: According to a model of gas/particle partitioning of semivolatile organic compounds in the atmosphere(1), methyl acrylate, which has a estimated vapor pressure of 86.6 mm Hg at 25 deg C(2), is expected to exist solely as a vapor in the ambient atmosphere. Vapor-phase methyl acrylate is degraded in the atmosphere by reaction with photochemically-produced hydroxyl radicals(SRC); the half-life for this reaction in air is estimated to be 2 days(SRC), calculated from its rate constant of 9.4X10-12 cu cm/molecule-sec at 25 deg C(SRC) that was derived using a structure estimation method(3). The rate constant for the reaction of methyl acrylate with ozone is 2.9X10-18 cu cm/molc-sec, corresponding to a half-life of 4 days at an atmospheric concentration of 7X10+11 molecules/cu cm(4). Methyl acrylate does not contain chromophores that absorb at wavelengths >290 nm(5) and therefore is not expected to be susceptible to direct photolysis by sunlight(SRC).

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