8007-45-2

Basic information

• Product Name: COAL TAR
• Synonyms: D03573;Tar coking;Tarcron 180;Tarcron 180L;Tarcron 230;COAL TAR CRUDE;carbo-cort;coaltar,aerosol
• CAS NO: 8007-45-2
• Molecular Weight: 0
• EINECS: 232-361-7
• Product Categories: UVCBs-organic
• Mol File: 8007-45-2.mol
• Article Data: 0

Chemical Properties

• Flash Point: 13°(55°F)
• Appearance: Dark brown/Liquid
• Density: 1.18~1.23
• Water Solubility: Not miscible or difficult to mix with water.
• Merck: 14,2426
• CAS DataBase Reference: COAL TAR(CAS DataBase Reference)
• NIST Chemistry Reference: COAL TAR(8007-45-2)
• EPA Substance Registry System: COAL TAR(8007-45-2)

Safety Data

• Hazard Codes: T
• Statements: 45
• Safety Statements: 53-45
• RIDADR: UN1170
• TSCA: Yes
• HazardClass: 3
• PackingGroup: II
• Hazardous Substances Data: 8007-45-2(Hazardous Substances Data)

Usage

Description

Coal tar is a complex hydrocarbon mixture produced by thermal destruction (pyrolysis) of coal, typically a dark viscous liquid or semisolid with a smoky or naphthenic odor. It is comprised of a variable mixture of organic compounds, including benzene, toluene, xylenes, cumenes, coumarone, indene, benzofuran, naphthalene, acenaphthene, methylnaphthalenes, fluorine, phenol, cresols, pyridine, picolines, phenanthracene, carbazole, quinolines, fluoranthene, and pyrene, among thousands of specific chemical constituents.

Uses

Used in Chemical Industry:
Coal tar is used as a raw material for the production of refined chemicals and coal-tar products, such as creosote, coal-tar pitch, and crude naphthalene and anthracene oils from the distillation of crude coal tar.
Used in Steel Industry:
Coal tar has been used as a fuel in open-hearth furnaces and blast furnaces.
Used in Surface Coating Formulations:
Coal tar serves as a binder and filler in surface-coating formulations and as a modifier for epoxy-resin surface coatings.
Used in Medicine:
U.S. Pharmacopeia–grade coal tar is approved for use in denatured alcohol. Coal-tar preparations have been used to treat various skin conditions, such as eczema, psoriasis, seborrheic dermatitis, and dandruff, and are available in forms like cleansing bars, creams, gels, lotions, ointments, shampoos, and other topical solutions and suspensions.
Used in Pesticides:
Coal tar is registered as an active ingredient in pesticides with the U.S. Environmental Protection Agency.
Used in Aluminum Smelting:
Coal-tar pitches are used primarily as the binder for aluminum-smelting electrodes.
Used in Roofing Materials and Refractory Brick:
Coal-tar pitches are used to impregnate and strengthen refractory brick for lining industrial furnaces and in roofing materials.
Used in Surface Coatings:
Coal-tar pitches are used in surface coatings, such as pipe-coating enamels and black varnishes for industrial steelwork and antifouling paints for boats.
Used in Foundry Cores:
Hard pitch is used as a binder for foundry cores.
Used in Production of Pitch Coke:
Coke-oven pitch is used to produce pitch coke, which is used as the carbon component of electrodes, carbon brushes, and carbon and graphite articles.
Used in Road Paving and Construction:
Distillation fractions and residues from high-temperature coal tars are used for road paving and construction.
Used in Electricity Generation and Coking:
Coal tar is used for constructing roads, electricity generation, and coking.
Used in Topical Medical Treatment:
Coal tar is used as a topical medical treatment for psoriasis, dandruff, and other types of rashes, such as eczema, atopic dermatitis, and chronic exudative dermatitis, and is formulated as a soap or ointment.

Safety Profile

A human and experimental skin irritant. A flammable liquid. When heated to SYNS: ANTHMCITE PARTICLES 0 COAL FACINGS 0 COAL, GROUND BITUMINOUS (DOq 0 COAL-MILLED 0 COAL SLAG-MILLED SEA COAL decomposition it emits acrid smoke and irritating fumes.

Carcinogenicity

Coal tars and coal-tar pitches are known to be human carcinogensbased on sufficient evidence of carcinogenicity from studies in humans.

Environmental Fate

Due to the variability in composition, it is not possible to describe all potential mechanisms of toxicity for coal tar. The reader is recommended to review additional references for individual constituents found in the Table of Contents. It is likely that acidity of some constituents, such as phenols, and the defatting potential of some hydrocarbons, contribute to the irritancy of coal tar. Phototoxicity of PAHs is likely to be a main cause of contact irritation. The carcinogenicity of PAH constituents is believed to lie in their potential for their reactive metabolites to be bound to macromolecules such as DNA. The mechanism of therapeutic value as a topical agent in the treatment of skin diseases is unknown but is thought to involve decreased epidermal proliferation.

Toxicity evaluation

Environmental partitioning will vary dependent upon the chemical characteristic of various constituents of coal tar. Photochemical degradation may occur in the atmosphere. If entered into aquatic systems, light hydrocarbon constituents such as benzene will volatilize in the air. Biodegradation in aquatic ecosystems will occur at various rates for different constituents. Large molecules such as PAHs are likely to adsorb to soil and sediment, undergoing slow degradation. Other hydrocarbons, such as phenols, may be readily degraded under aerobic conditions.