Trichloroethylene is a clear liquid at room temperature with a sweet, chloroform-like odour. Produced commercially since the 1920s, trichloroethylene has been used as a solvent and degreaser. Trichloroethylene is related to another chlorinated solvent, tetrachloroethylene (also called perchloroethylene or PERC). Trichloroethylene may also be referred to as trichloroethene or TCE. There are numerous other synonyms and product names; see the Hazardous Substances Data Bank (HSDB) for more information.
Trichloroethylene has been classified by the International Agency for Research on Cancer (IARC) as Group 1, a known human carcinogen, with a well established link to kidney cancer. Epidemiologic studies also found limited evidence for associations between TCE exposure and non-Hodgkin lymphoma and liver cancer.
Additional adverse health effects associated with low to moderate inhalation exposure to trichloroethylene range from headaches and dizziness to nerve damage. Acute exposures may damage the kidneys and liver, and cause arrhythmias. Skin irritation following dermal exposure has also been reported.
stel = short term exposure limit (15 min. maximum)
ACGIH = American Conference of Governmental Industrial Hygienists
TLV = threshold limit value
Canadian Environmental Guidelines
Canadian Drinking Water Guidelines
Ontario Ambient Air Quality Criteria
Annual: 2.3 μg/m3 24 hour: 12 μg/m3
BC's Contaminated Sites Regulation, BC Reg 375/96
For the protection of human health, sets soil standards for the intake of contaminated soil for: Agricultural, urban park and residential soil: 200 μg/g Commercial soil: 600 μg/g Industrial soil: 10,000 μg/g
Drinking water standards: 5 μg/L
μg/m3 = micrograms per cubic metre
Trichloroethylene was not included in other Canadian government environmental guidelines reviewed.[8,9,10,11]
Users of >1,000 kg/yr of TCE for cold or vapour degreasing must comply with these regulations
National Classification System for Contaminated Sites
Rank = "High hazard"
DSL = domestic substance list
CEPA = Canadian Environmental Protection Act
Trichloroethylene was not included in other Canadian chemical listings reviewed.
Trichloroethylene is used primarily to degrease metals in automotive and metal industries. Another important use is as a feedstock material to produce other chemicals, such as fluorinated hydrocarbons and polymers. Trichloroethylene is also used to: produce adhesives and copolymers; clean electronic components; perform petroleum industry processes involving refining catalysts, paint removers, coatings, and vinyl resins; and act as a reagent/solvent in laboratory applications.
As a solvent, trichloroethylene has been used in the past to extract natural fats and oils, spices, hops, and caffeine from food products. It was also used as a dry cleaning solvent, but since the 1950s when tetrachloroethylene gained popularity, this use declined. Use as a spot treatment in the textile industry, however, continued into the 1990s at least.
Canadian Production and Trade
Production and Trade
4 t of 'trichloroethylene'
455 t of 'trichloroethylene'
t = tonne
Inhalation and dermal contact are the most important routes of occupational exposure to trichloroethylene.
CAREX Canada estimates that approximately 9,800 Canadians are exposed to trichloroethylene in their workplaces. The largest industrial groups exposed are metal manufacturing, followed by personal and household goods repair and maintenance. The largest occupational groups exposed are metal product machine operators, plating, metal spraying and related operators, and labourers in metal fabrication. All of these occupations involve metal degreasing; workers who degrease metals tend to be the most heavily exposed occupational group.
Other important occupations outside the metal industry that may be exposed to trichloroethylene include tailors and dressmakers, upholsterers, and sewing machine operators.
The primary route of exposure to trichloroethylene for the general public is inhaling indoor air.[17,19] Minor sources of exposure include food, drinking water, and outdoor air. Trichloroethylene in indoor air likely comes from volatilized water sources (e.g. from showering), as well as from household products containing the solvent. Elevated concentrations in indoor air may also occur in homes that are built above groundwater contaminated with trichloroethylene. Trichloroethylene can be formed in groundwater when tetrachloroethylene breaks down.
Recent surveys of trichloroethylene levels in Canadian food products are not available. However, given that trichloroethylene has been banned from food preparation since 1977, these levels are expected to be negligible.
Most trichloroethylene that is used is expected to eventually enter the atmosphere. Point sources that may create higher, localized environmental levels of trichloroethylene include metal degreasing operations, sewage treatment plants, textile mills, landfills, incinerators, and septic tanks.
Searches of Environment Canada's National Pollutant Release Inventory (NPRI) and the US Household Products Database yielded the following results on current potential for exposure to trichloroethylene in Canada:
NPRI and US Household Products Database
Substance name: 'Trichloroethylene'
Released into Environment
Manufacturing of plastic, aerospace, metal, and chemical products, non-residential building construction, waste treatment and disposal, pulp and paper mills (12 facilities)
Sent to off-site recycling
US Household Products 2016
Cleaners/degreasers, vehicle undercoating, adhesives, sealants, and toner enhancer
t = tonne
Our team has performed a detailed scan of exposure control resources and assembled a compilation of key publications and resources. These are organized by type of exposure (environmental or occupational) and by specificity (general or carcinogen-specific). Please visit our Exposures Reduction Resources page to view.
We also recommend exploring the Prevention Policies Directory, a freely-accessible online tool offering information on policies related to cancer and chronic disease prevention. Providing summaries of the policies and direct access to the policy documents, the Directory allows users to search by carcinogen, risk factor, jurisdiction, geographical location, and document type. Click here to learn more about policies specific to trichloroethylene in the Directory. For questions about this resource, please contact a member of the Prevention Team at the Canadian Partnership Against Cancer at email@example.com.