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HuagongsheHuagongshe Chemistry Print Report · For research reference only
HCID 11241Generated: October 23, 2026

3-Chloro-2-methyl-1-propene

METHALLYL CHLORIDE · Mac · 3-chloro-2-methylprop-1-ene · 3-CHLORO-2-METHYL-1-PROPENE · Isobutenyl chloride · beta-methylallylchloride · Methylallyl chloride · 2-METHYLALLYL CHLORIDE

https://huagongshe.com/en/chemical/11241

3-Chloro-2-methyl-1-propene molecular structure

Identifiers & Physical Properties

CAS No.563-47-3
Molecular formulaC4H7Cl
Average molar mass90.55 g/mol
Monoisotopic mass90.0236279 g/mol
SMILESC=C(C)CCl
InChIKeyOHXAOPZTJOUYKM-UHFFFAOYSA-N
PubChem CID11241
ChEMBLCHEMBL157368
ChEBICHEBI:82419
EC No.209-251-2
DTXSIDDTXSID1020279

Chemical & Physical Properties

XLogP2.1
Topological polar surface area0
Hydrogen bond donors0
Hydrogen bond acceptors0
Rotatable bonds1
Heavy atoms5
Formal charge0
Complexity38.9
Chemical classesOther Classes -> Halogenated Aliphatics, UnsaturatedFlammable agents - 3rd degree
SpringerMaterials PropertiesSchoenflies notation
LogP (partition coefficient)1.98
OdorSHARP, PENETRATINGDisagreeable odor
Density0.928 at 68 °F (USCG, 1999) - Less dense than waterwill float0.9210 at 15 °C/4 °C0.9165 at 20 °C/4 °CDensity of commercial grade = 0.926-0.930 at 20 °C/20 °CRelative density (water = 1): 0.920.9257 @ 20°C0.925 g/mL at 20 °C (lit.)
Viscosity4.2X10-4 Pa.s
Color/FormCOLORLESS TO STRAW-COLORED LIQUID
Solubilityless than 1 mg/mL at 70 °F (NTP, 1992)Miscible in alcohol and ether, very soluble in chloroform, and soluble in acetone.Solubility in water at 20 °C is ca. 0.05 wt%water solubility in methylallyl chloride is 0.04 wt%.1400 mg/l in water at 25 °C.Solubility in water, g/100ml at 25 °C: 0.14 (very poor)H2O: insoluble0.5 g/L (20 ºC)
Flash point9 °F (NTP, 1992)-12 °C-3 °F (OPEN CUP)92 °F (-12 °C) (CLOSED CUP)-12 °C c.c.
Boiling point160 to 162 °F at 760 mmHg (NTP, 1992)71-72 °C72.17 °C @760 [mm Hg]71-72 °C (lit.)
Melting pointless than -112 °F (NTP, 1992)< -80 °C-80 °C (lit.)
Vapor density3.12 (NTP, 1992) - Heavier than airwill sink (Relative to Air)3.1 (AIR= 1)Relative vapor density (air = 1): 3.13.12 (vs air)
Vapor pressure102 mm Hg ( 20 °C)
Refractive indexn20/D 1.427(lit.)
Storage conditions2-8°C
Physical stateLiquid
ColorClear
Explosive limits2.2-10.4%(V)
Merck14,2148
BRN878160
Henry's law constant1.1×10-3 mol/(m3Pa) at 25℃, Duchowicz et al. (2020)
InChI1S/C4H7Cl/c1-4(2)3-5/h1,3H2,2H3
InChIKeyOHXAOPZTJOUYKM-UHFFFAOYSA-N
SMILESCC(=C)CCl
Toxicology and CarcinogenesisToxicology and Carcinogenesis Studies of 3-Chloro-2-methylpropene (Technical grade containing 5% Dimethylvinyl chloride) (CASRN 563-47-3) in F344/N Rats and B6C3F1 Mice (Gavage Studies)
CAS DataBase Reference563-47-3(CAS DataBase Reference)
EWG's Food Scores3-4
FDA UNII7A9X1C3I3O
Proposition 65 List3-Chloro-2-methylpropene
IARC2B (Vol. 63, 115) 2018
NIST Chemistry Reference1-Propene, 3-chloro-2-methyl-(563-47-3)
EPA Substance Registry System3-Chloro-2-methyl-1-propene (563-47-3)
UNSPSC Code12352101
NACRESNA.22
GHS pictogramGHS02,GHS05,GHS06,GHS08,GHS09
Signal wordDanger
GHS hazard statementsH331-H302-H314-H361-H372-H373-H317-H351-H335-H336-H304-H411-H225
GHS precautionary statementsP501-P273-P272-P270-P202-P240-P260-P210-P233-P201-P243-P241-P242-P271-P264-P280-P370+P378-P391-P308+P313-P362+P364-P303+P361+P353-P333+P313-P301+P310-P301+P330+P331-P304+P340+P310-P305+P351+P338+P310-P403+P233-P403+P235-P405
Personal protective equipment (PPE)Faceshields, Gloves, Goggles, type ABEK (EN14387) respirator filter
Hazard symbolsF,C,N
Risk statements (R)11-20/22-34-43-51/53
Safety statements (S)9-16-29-36/37/39-45-61-26
UN transport numberUN 2554
Water hazard class (WGK)2
RTECS numberUC8050000
Autoignition temperature899 °F
TSCA inventory statusTSCA listed
Hazard class3Acute Tox. 4 InhalationAcute Tox. 4 OralAquatic Chronic 2Eye Dam. 1Flam. Liq. 2Skin Corr. 1BSkin Sens. 1
Packing groupII
Customs code29032900
Storage class3 - Flammable liquids
Hazardous substances data563-47-3(Hazardous Substances Data)
REACH registrationsActive
Limited quantities1.0 L (0.3 gallon) (liquid)
Excepted quantitiesMax Inner Pack (30g or 30ml) and Max Outer Pack (500g or 500ml)

Safety & Regulations

GHS classificationDangerH225: Highly Flammable liquid and vapor [Danger Flammable liquids]P210, P233, P240, P241, P242, P243, P260, P261, P264, P270, P271, P272, P273, P280, P301+P317, P301+P330+P331, P302+P352, P302+P361+P354, P303+P361+P353, P304+P340, P305+P354+P338, P316, P317, P321, P330, P333+P317, P362+P364, P363, P370+P378, P391, P403+P235, P405, and P501 (click each P-code to see the statement)H225 (100%): Highly Flammable liquid and vapor [Danger Flammable liquids]P203, P210, P233, P240, P241, P242, P243, P260, P261, P264, P264+P265, P270, P271, P272, P273, P280, P301+P316, P301+P317, P301+P330+P331, P302+P352, P302+P361+P354, P303+P361+P353, P304+P340, P305+P354+P338, P316, P317, P318, P321, P330, P331, P333+P317, P362+P364, P363, P370+P378, P391, P403+P233, P403+P235, P405, and P501 (click each P-code to see the statement)
Regulatory informationChemical: 1-Propene, 3-chloro-2-methyl-Hazard Traits - CarcinogenicityCommission Regulation No 844/20121-Propene, 3-chloro-2-methyl- is listed on the EPA's Chemical Data Reporting (CDR) system. Manufacturers and importers of 1-Propene, 3-chloro-2-methyl- are required to report information about their production and use of this chemical to the EPA under the Toxic Substances Control Act (TSCA). (40 eCFR Part 711)Status: Active Update: 24-09-2020 https://echa.europa.eu/registration-dossier/-/registered-dossier/206471-Propene, 3-chloro-2-methyl-: Does not have an individual approval but may be used under an appropriate group standard
Other safety informationIMAP assessments - 1-Propene, 3-chloro-2-methyl-: Environment tier I assessment
DOT labelFlammable Liquid
Fire hazardsSpecial Hazards of Combustion Products: Irritating and toxic hydrogen chloride and phosgene vapors may be formed.· HIGHLY FLAMMABLE: Will be easily ignited by heat, sparks or flames.Highly flammable. Gives off irritating or toxic fumes (or gases) in a fire. Vapour/air mixtures are explosive. Heating will cause rise in pressure with risk of bursting.
Fire potentialFLAMMABLE, DANGEROUS FIRE RISK.
Health hazardsInhalation causes irritation of nose and throat. Contact of vapor or liquid with eyes causes irritation. Liquid irritates skin. Ingestion causes irritation of mouth and stomach. (USCG, 1999)· May cause toxic effects if inhaled or absorbed through skin.
Hazards summaryA skin, eye, and respiratory tract irritantTear drawingInhalation of high concentrations may cause CNS effectsMay cause skin sensitization[ICSC] Dangerous fire riskExplosive limits in air are 3.2 - 8.1%[Hawley] Harmful by inhalation and ingestionCauses burnsLachrymatory effect[MSDSonline] See Carcinogenicity of some industrial chemicals, Volume 115. [IARC, News Release, 23 February 2016] Methylallyl chloride (UN2554) has warning of explosive polymerization[ERG 2016]
DOT ID and guide2554 130P
Reactive groupHalogenated Organic Compounds
EC classificationSymbol: F, C, NR: 11-20/22-34-43-51/53S: (2)-9-16-26-29-36/37/39-45-61
UN classificationUN Hazard Class: 3UN Pack Group: II
Special ReportsToxicology & Carcinogenesis Studies of 3-Chloro-2-methylpropene in F344/N Rats and B6C3F1 Mice Technical Report Series No. 300 (1986) NIH Publication No. 86-2556 U.S. Department of Health and Human Services, National Toxicology Program, National Institute of Environmental Health Sciences, Research Triangle Park, NC 27709National Toxicology Program. Eleventh Report on Carcinogens (2005). The Report on Carcinogens is an informational scientific and public health document that identifies and discusses substances (including agents, mixtures, or exposure circumstances) that may pose a carcinogenic hazard to human health. 3-Chloro-2-methyl-1-propene (563-47-3) is listed as reasonably anticipated to be a human carcinogen.[Available from, as of July 31, 2009: http://ntp.niehs.nih.gov/ntp/roc/eleventh/profiles/s0403c2m.pdf]
Fire fightingExcerpt from ERG Guide 130 [Flammable Liquids (Water-Immiscible / Noxious)polymerization hazard]:Use powder, carbon dioxide, foam. In case of fire: keep drums, etc., cool by spraying with water.
First aid measuresFresh air, rest. Half-upright position. Artificial respiration may be needed. Refer for medical attention.Remove contaminated clothes. Rinse and then wash skin with water and soap.First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then refer for medical attention.Rinse mouth. Do NOT induce vomiting. Rest. Refer for medical attention .
Accidental release measures· CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper not available or no answer, refer to appropriate telephone number listed on the inside back cover.· ELIMINATE all ignition sources (no smoking, flares, sparks or flames) from immediate area.
First aidEYES: First check the victim for contact lenses and remove if present. Flush victim's eyes with water or normal saline solution for 20 to 30 minutes while simultaneously calling a hospital or poison control center. Do not put any ointments, oils, or medication in the victim's eyes without specific instructions from a physician. IMMEDIATELY transport the victim after flushing eyes to a hospital even if no symptoms (such as redness or irritation) develop.General First Aid:
Safe storageFireproof. Separated from strong oxidants and strong bases. Cooled. Well closed. Ventilation along the floor. Store in an area without drain or sewer access.
Exposure control and personal protection· Wear positive pressure self-contained breathing apparatus (SCBA).
Fire fighting proceduresDo not extinguish fire unless flow can be stopped. Use water in flooding quantities as fog because solid streams of water may spread fire. Cool all affected containers with flooding quantities of water, being sure to apply water from as far a distance as possible. Use alcohol foam, carbon dioxide or dry chemical.Personnel protection: Keep upwind of fire and avoid breathing vapors. Do not handle broken packages without protective equipment and be sure to wash away any material which may have contacted the body, with copious amounts of soap and water.Wear boots, protective gloves, goggles and a self-contained breathing apparatus when fighting fires.
Nonfire spill responseExcerpt from ERG Guide 130 [Flammable Liquids (Water-Immiscible / Noxious)polymerization hazard]:
Disposal methodsSRP: At the time of review, criteria for land treatment or burial (sanitary landfill) disposal practices are subject to significant revision. Prior to implementing land disposal of waste residue (including waste sludge), consult with environmental regulatory agencies for guidance on acceptable disposal practices.
Spillage disposalEvacuate danger area! Consult an expert! Personal protection: chemical protection suit including self-contained breathing apparatus. Remove all ignition sources. Collect leaking and spilled liquid in sealable containers as far as possible. Absorb remaining liquid in sand or inert absorbent. Then store and dispose of according to local regulations. Do NOT wash away into sewer. Do NOT let this chemical enter the environment.
Preventive MeasuresDo not handle broken packages without protective equipment and be sure to wash away any material which may have contacted the body, with copious amounts of soap and water.SRP: The scientific literature for the use of contact lenses in industry is conflicting. The benefit 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.
Isolation and EvacuationExcerpt from ERG Guide 130 [Flammable Liquids (Water-Immiscible / Noxious)polymerization hazard]:Immediate precautionary measure
Ecotoxicity valuesMEDIAN LETHAL CONCN OF METHYLALLYL CHLORIDE FOR THE SMALL BLACK BEETLE, TRIBOLIUM DESTRUCTOR, WAS 21.9-22.9 G/CU M.LD50 Goldfish 14 mg/l/24 hr
Environmental fateTERRESTRIAL FATE: Based on a recommended classification scheme(1), an estimated Koc value of 81(SRC), determined from a measured water solubility(2) and a recommended regression-derived equation(3), indicates that 3-chloro-2-methyl-1-propene will have high mobility in soil(SRC). Volatilization of 3-chloro-2-methyl-1-propene may be important from moist soil surfaces(SRC) given an estimated Henry's Law constant of 8.7X10-3 atm-cu m/mole(SRC), calculated from experimental values for water solubility(2) and vapor pressure(4). Volatilization from dry soil surfaces(SRC) is expected based on a measured vapor pressure of 101.7 mm Hg(4). Based on limited data, 3-chloro-2-methyl-1-propene is expected to biodegrade under aerobic conditions in soilin screening tests, this compound reached 42%(5) of the theoretical BOD in 5 days and 89-107% of the theoretical BOD in 28 days(2).AQUATIC FATE: Based on a recommended classification scheme(1), an estimated Koc value of 81(SRC), determined from a measured water solubility(2) and a recommended regression-derived equation(1), indicates that 3-chloro-2-methyl-1-propene should not adsorb to suspended solids and sediment in water(SRC). 3-Chloro-2-methyl-1-propene may volatilize from water surfaces(1,SRC) based on an estimated Henry's Law constant of 8.7X10-3 atm-cu m/mole(SRC), calculated from experimental values for water solubility(2) and vapor pressure(3). Estimated half-lives for a model river and model lake are 3 hours and 4 days, respectively(1,SRC). According to a classification scheme(4), an estimated BCF value of 10(1,SRC), from a measured water solubility(2), suggests that bioconcentration in aquatic organisms is low(SRC). Based on limited data, 3-chloro-2-methyl-1-propene is expected to biodegrade under aerobic conditions in waterATMOSPHERIC FATE: According to a model of gas/particle partitioning of semivolatile organic compounds in the atmosphere(1), 3-chloro-2-methyl-1-propene, which has a measured vapor pressure of 101.7 mm Hg at 20 °C(2), will exist solely as a vapor in the ambient atmosphere. Vapor-phase 3-chloro-2-methyl-1-propene is degraded in the atmosphere by reaction with photochemically-produced hydroxyl radicals and ozone(SRC)the half-lives for these reactions in air are estimated to be about 10 and 27 hours, respectively(3,SRC).
Adverse effectsNeurotoxin - Acute solvent syndrome
Exposure routesThe substance can be absorbed into the body by inhalation of its vapour and by ingestion.
Signs and SymptomsCough. Sore throat. Headache. Shortness of breath.Redness. Pain.Watering of the eyes. Redness. Pain.
Ongoing Test StatusThe following link will take the user to the National Toxicology Program (NTP) Test Agent Search Results page, which tabulates all of the "Standard Toxicology & Carcinogenesis Studies", "Developmental Studies", and "Genetic Toxicity Studies" performed with this chemical. Clicking on the "Testing Status" link will take the user to the status (i.e., in review, in progress, in preparation, on test, completed, etc.) and results of all the studies that the NTP has done on this chemical. [http://ntp-apps.niehs.nih.gov/ntp_tox/index.cfm?fuseaction=ntpsearch.searchresults&searchterm=563-47-3]
Effluent ConcentrationsSamples collected from a chemical plant chlorinated still bottom extract contained 3-chloro-2-methyl-1-propene at unreported concentrations(1). Effluent samples collected from an advanced wastewater treatment plant in Lake Tahoe, California in 1974 contained unreported concentrations of 3-chloro-2-methyl-1-propene(2).
ICSC Environmental DataThe substance is harmful to aquatic organisms.
Soil Adsorption/MobilityThe Koc of 3-chloro-2-methyl-1-propene is estimated as approximately 81(SRC), using a measured water solubility of 1400 mg/l at 25 °C(1) and a regression-derived equation(2,SRC). According to a recommended classification scheme(3), this estimated Koc value suggests that 3-chloro-2-methyl-1-propene has high mobility in soil(SRC).
TSCA Test SubmissionsThe ability of 3-chloro-2-methylpropene (CMP) to induce morphological transformation in the BALB/3T3 mouse cell line (Cell Transformation Assay) in the presence and absence of added metabolic activation by Aroclor-induced rat liver S9 fraction was evaluated. Based on preliminary clonal toxicity determinations (exposure time=2 hrs), CMP was tested at 0.03, 0.1, 0.3 and 1.0 ul/ml in the absence of activation (cell survival ranging from 100-77% relative to acetone solvent control), and at 0.10, 0.15, 0.20 and 0.25 ul/ml in the presence of added metabolic activation (cell survival ranging from 85% to <1%). Test material did not induce the appearance of a significant number of transformed foci.The ability of 3-chloro-2-methylpropene (CMP) to induce morphological transformation in the BALB/3T3 mouse cell line (Cell Transformation Assay) in the presence and absence of added metabolic activation by Aroclor-induced rat liver S9 fraction was evaluated. Based on preliminary clonal toxicity determinations (exposure time=2 hrs), CMP was tested at 0.03, 0.1, 0.3 and 1.0 ul/ml in the absence of activation (cell survival ranging from 95-48% relative to acetone solvent control), and at 0.1, 0.18, 0.3 and 0.5 ul/ml in the presence of added metabolic activation (cell survival ranging from 124-48%). Test material did not induce the appearance of a significant number of transformed foci, although a marginal yet dose-responsive increase in transformation was observed in the assay with added metabolic activation.Toxicity of 1-chloro-2-methylpropene (CMP) with respect to testicular changes was evaluated in male albino Wistar rats (10/treated group, 20 in arachis oil vehicle control group) exposed orally to CMP by gavage at dosage levels of 0, 40 or 60 mg/kg/day for 14 days. On day 15, the animals were sent for pathological examination. Significant differences were observed between treated and control animals in the following: decreased maternal body weight and body weight gain (high-dose group), increased incidence of minor renal changes (increase in eosinophilic intra-cytoplasmic inclusion droplets in the proximal convoluted tubules, high-dose group), and increased incidence of gastric lesions, severe irritative changes in the stomach, and focal erosion of the cardiac mucosa with moderate hyperkeratosis and acanthosis in the stomach (both treated groups). No significant differences between treated and control animals were observed in the following: maternal mortality, clinical observations, testes weights, morphology, or detailed macroscopic and microscopic examination of the testes, epididymides, ductuli efferentes, and vasa deferentes.The mutagenicity of 3-chloro-2-methylpropene was evaluated in Salmonella tester strains TA1535, TA100, TA1537, TA1538 and TA98 (Ames test), both in the presence and absence of added metabolic activation by Aroclor-induced rat liver S9 fraction. 3-Chloro-2-methylpropene, diluted in DMSO, was tested at concentrations up to 100ul/plate using the plate incorporation technique. 3-Chloro-2-methylpropene did not cause a positive response in any tester strain with or without metabolic activation.For more TSCA Test Submissions (Complete) data for 3-CHLORO-2-METHYL-1-PROPENE (9 total), please visit the HSDB record page.
Human Toxicity ExcerptsSYMPTOMATOLOGY: 1. A. INHALATION, HIGH VAPOR CONCN: GASPING, REFUSAL TO BREATHE, COUGHING, SUBSTERNAL PAIN, & EXTREME RESP DISTRESS @ ... CONCN OVER 1500 PPM. IRRITATION OF EYES & UPPER RESP MUCOSA APPEARS PROMPTLY AFTER EXPOSURE TO CONCENTRATED VAPORS. LACRIMATION AND HEADACHE ARE PROMINENT. COMA MAY OCCUR RAPIDLY. B. INHALATION, LOW VAPOR CONCN: CENTRAL NERVOUS DEPRESSION & MODERATE IRRITATION OF RESP SYSTEM. 2. DERMAL: SEVERE SKIN IRRITATION WITH MARKED INFLAMMATORY RESPONSE OF EPIDERMIS & UNDERLYING TISSUES. /DICHLOROPROPENES/SYMPTOMATOLOGY: 3. ORAL: ACUTE GI DISTRESS WITH PULMONARY CONGESTION & EDEMA. CNS DEPRESSION, PERHAPS EVEN IN ABSENCE OF IMPAIRED OXYGEN UPTAKE. 4. BY ANY ROUTE, POSSIBLE INJURIES TO LIVER, KIDNEYS & HEART. /DICHLOROPROPENES/
Artificial Pollution Sources3-Chloro-2-methyl-1-propene's production and use as a chemical intermediate in the manufacture of insecticides, plastics, pharmaceuticals and other chemicals(1) may result in its release to the environment through various waste streams(SRC). 3-Chloro-2-methyl-1-propene's former use as a fumigant(2) for grains, tobacco, soil(1) and vegetable seeds(4) would have resulted in its direct release to the environment(SRC).
Personal protective equipment (PPE)Faceshields, Gloves, Goggles, type ABEK (EN14387) respirator filter
Water hazard class (WGK)2
TSCA inventory statusTSCA listed
RTECS numberUC8050000
UN transport numberUN 2554
Customs code29032900
Risk statements (R)11-20/22-34-43-51/53
Signal wordDanger
GHS pictogramGHS02,GHS05,GHS06,GHS08,GHS09
Hazard symbolsF,C,N
Safety statements (S)9-16-29-36/37/39-45-61-26
Hazard class3Acute Tox. 4 InhalationAcute Tox. 4 OralAquatic Chronic 2Eye Dam. 1Flam. Liq. 2Skin Corr. 1BSkin Sens. 1
Storage class3 - Flammable liquids
Packing groupII
GHS hazard statementsH331-H302-H314-H361-H372-H373-H317-H351-H335-H336-H304-H411-H225
Limited quantities1.0 L (0.3 gallon) (liquid)
Excepted quantitiesMax Inner Pack (30g or 30ml) and Max Outer Pack (500g or 500ml)
REACH registrationsActive
Autoignition temperature899 °F
GHS precautionary statementsP501-P273-P272-P270-P202-P240-P260-P210-P233-P201-P243-P241-P242-P271-P264-P280-P370+P378-P391-P308+P313-P362+P364-P303+P361+P353-P333+P313-P301+P310-P301+P330+P331-P304+P340+P310-P305+P351+P338+P310-P403+P233-P403+P235-P405
Hazardous substances data563-47-3(Hazardous Substances Data)

Applications & Uses

Description

3-Chloro-2-methylpropene is used as an intermediate to produce carbofuran, herbicides, plastics, pharmaceuticals and other organics. It is also used as an additive in textile and perfumes. It was used to study ring opening polymerization of oxirane derivatives using organotin phosphate condensate and cationic polymerization of 3-Chloro-2-methylpropene with AICI3 and AIBr3 as initiators. It is also the reactant for the synthesis of cyclobutanone.

Uses

In organic synthesis.

Uses

3-Chloro-2-methylpropene has been used as reactant in the synthesis of cyclobutanone. It is used as an intermediate in the production of plastics, pharmaceuticals and other organic chemicals.

Uses

3-Chloro-2-methyl-1-propene was used to study ring opening polymerization of oxirane derivatives using organotin phosphate condensate. It was used to study cationic polymerization of 3-Chloro-2-methyl-1-propene using using AICI3 and A3IBr, as initiators.

General Description

A colorless to straw-colored liquid with a sharp penetrating odor. Less dense than water and insoluble in water. Flash point below 0°F. May be toxic by ingestion. Irritating to skin and eyes. Used to make plastics and pharmaceuticals.