SPECTRUM

Chemical Fact Sheet

Chemical Abstract Number (CAS #) 108101
CASRN 108-10-1
Synonyms4-Methyl-2-pentanone
MIBK
Methyl isobutyl ketone
2-Pentanone, 4-methyl
Analytical Methods EPA Method 524.2
EPA Method 8015
EPA Method 8260
Molecular FormulaC6H12O

Link to the National Library of Medicine's Hazardous Substances
Database for more details on this compound.

Use Denaturant for rubbing alcohol SOLVENT FOR PAINTS, VARNISHES, NITROCELLULOSE, LACQUERS, MFR OF METHYL AMYL ALCOHOL; ORGANIC SYNTHESIS, EXTRACTION PROCESSES, INCL EXTRACTION OF URANIUM FROM FISSION PRODUCTS, ORGANIC SYNTHESIS SOLVENT FOR PROTECTIVE COATINGS & IN RARE METALS EXTRACTION, DEWAXING OF MINERAL OILS & IN MFR OF ANTIBIOTICS USED IN DRYCLEANING PREPARATIONS, SYNTHESIS OF METHYL ISOBUTYL CARBIONOL (MIBC) SYNTHETIC FLAVORING ADJUVANT: FLAVOR USEFUL IN FRUIT FLAVORS, RUM CHEESE.
Consumption Patterns 65% AS SOLVENT FOR PROTECTIVE COATINGS, 5% AS SOLVENT FOR RARE METAL EXTRACTION; 5% EXPORTED; 25% FOR MISC APPLICATIONS INCLUDING DEWAXING OF MINERAL OILS AND IN THE MANUFACTURE OF ANTIBIOTICS (1971) NITROCELLULOSE LACQUERS, 25%; OTHER COATINGS, INKS, LACQUERS, 30%; SOLVENT EXTRACTION, 10%; MIBC, 10%; METALURGICAL, 5%; EXPORT, 15%; MISC, 5% (1980) CHEMICAL PROFILE: Methyl isobutyl ketone. Demand: 1986: 145 million lb; 1987: 148 million lb; 1991 projected/: 155 million lb. (Includes exports; in addition, 12.5 million lb were imported in 1986).
Apparent Color COLORLESS LIQUID
Odor PLEASANT ODOR ; HAS FAINT, KETONIC AND CAMPHOR ODOR
Boiling Point 116.8 DEG C AT 760 MM HG
Melting Point -84.7 DEG C
Molecular Weight 100.16
Density 0.7978 AT 20 DEG C
Odor Threshold Concentration 0.10 ppm Air: 0.68 ul/l; water: 1.3 mg/l; odor safety class B; B= 50-90% of distracted persons perceive warning of TLV 0.47 ppm Odor detection limit in air: 9.70x10-6 g/l (gas). 0.410 mg/cu m (odor low) 192.7 mg/cu m (odor high).
Sensitivity Data AT 100 PPM METHYL ISOBUTYL KETONE MAY IRRITATE EYES OF MORE SENSITIVE PERSON. Vapors cause irritation of nose . Chemical safety information sheet. Toxicity: irritation of eyes, nose and throat.
Environmental Impact Methyl isobutyl ketone (MIBK) is released to the environment in effluent and emissions from its manufacturing and use facilities, in exhaust gas from vehicles, and from land disposal and ocean dumping of consumer products and industrial wastes which contain this compound. A large number of industries may release or dispose of this compound including: rare metal extracters and manufactures of coatings (ie lacquers, varnishes, paints), pharmaceuticals, pesticides, rubber processing chemicals, and adhesives. If released to soil, MIBK may be removed by direct photolysis on soil surfaces, volatilization, or aerobic biodegradation. This compound is also susceptible to extensive leaching and has been detected in landfill leachate. Chemical hydrolysis is not expected to be environmentally significant. If released to water, the primary removal mechanisms for MIBK are expected to be volatilization (t1/2 15-33 hours) and direct photolysis. Aerobic biodegradation may be of minor importance. MIBK is not expected to undergo chemical oxidation or chemical hydrolysis, bioaccumulate in aquatic organisms or adsorb significantly to suspended solids or sediments in water. In the atmosphere, methyl isobutyl ketone (MIBK) will be subject to direct photolysis (t1/2 15 hours in sunlight) and reaction with hydroxyl radical (t1/2 16-17 hours). In photochemical smog situations, MIBK may also react with nitrogen oxides. Acetone is a major photooxidation product of MIBK, and in the presence of nitrogen oxides, peroxyacetylnitrate (PAN) and methyl nitrate will also be formed. The most probable routes of exposure to MIBK by the general population are inhalation and dermal contact during use of consumer products which contain this compound. Such products would include coatings, adhesives, rubber cements, pesticides, as well as a variety of other products. Some segments of the general population may also be exposed to MIBK by inhalation of contaminated air in source dominated areas or areas near landfills and by ingestion of contaminated drinking water.
Environmental Fate TERRESTRIAL FATE: If released to soil, methyl isobutyl ketone (MIBK) may be removed by direct photolysis on soil surfaces, volatilization, or aerobic biodegradation. MIBK is also susceptible to extensive leaching and has been detected in landfill leachate . This compound is not expected to undergo chemical hydrolysis. Rathbun RE, Tai DY; Water Air Soil Poll 17: 281-93 (1982)] AQUATIC FATE: If released to water, the primary removal mechanisms for methyl isobutyl ketone (MIBK) are expected to be volatilization (t1/2 15-33 hours(1,SRC) and direct photolysis. Aerobic biodegradation may be of minor importance. MIBK is not expected to undergo chemical oxidation or chemical hydrolysis, bioaccumulate in aquatic organisms or adsorb significantly to suspended solids or sediments in water. ATMOSPHERIC FATE: In the sunlit atmosphere, methyl isobutyl ketone (MIBK) will be subject to direct photolysis (t1/2 15 hours) and reaction with hydroxyl radicals (t1/2 16-17 hours)(2-4). In photochemical smog situations MIBK may also react with nitrogen oxides. Acetone is a major photooxidation produce of MIBK, and in the presence of nitrogen oxides, peroxyacetylnitrate (PAN) and methyl nitrate will also be formed .
Drinking Water Impact SURFACE WATER: Methyl isobutyl ketone was qualitatively identified in Cuyahoga River . Identified, but not quantified, in 1 out of 204 samples of surface water collected near heavily industrialized areas across the US . Qualitatively identified in 1 out of 17 samples of Delaware River water collected between Aug 1976 to March 1977 at river mile 78 and 132 . DRINKING WATER: Methyl isobutyl ketone was detected in 4 out of 14 drinking water supplies sampled between 1977 and 1979 . GROUNDWATER: Leachate collected from the Southington, CT municipal landfill during 1982-1983 contained methyl isobutyl ketone (MIBK) at a concn ranging from 172-263 ug/l . During 1981-82 MIBK was detected in leachate from Granby, CT municipal landfill, concn range 25-150 ppb . During 1984 after an attempt to abate groundwater contamination by capping the landfill and diverting stormwater, MIBK was not detected in leachate, detection limit not reported . Qualitatively identified in leachate from Maxy Flats, KY low-level radioactive waste disposal site . EFFL: Methyl isobutyl ketone (MIBK) detected in aqueous condensate from low-Btu gasification of rosebud coal at a concn of 78 ppm. Detected in Omega-9 retort water from in situ oil shale processing at a concn of 105 ppm . MIBK has been identified in the final effluent from at least one plant in each of the following industries: printing and publishing, coal mining, electronic, and organic chemicals . Detected at a concn of 190 ug/L in formation water discharged from an offshore (Shell Oil) production operation in the Gulf of Mexico . MIBK was not detected in air samples taken from the Allegheny Tunnel during 1979, detection limit not reported .

DISCLAIMER - Please Read

Florida-Spectrum List of Services
Florida-Spectrum Homepage