Coal Tar
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Tóm tắt nội dung
This article is compiled based on the United States Pharmacopeia (USP) – 2025 Edition
Issued and maintained by the United States Pharmacopeial Convention (USP)
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1 DEFINITION
Coal Tar is the tar obtained as a by-product during the destructive distillation of bituminous coal at temperatures in the range of 900°-1100°. It may be processed further either by extraction with alcohol and suitable dispersing agents and maceration times or by fractional distillation with or without the use of suitable organic solvents.
2 IMPURITIES
2.1 RESIDUE ON IGNITION (281)
Sample: 100 mg
Acceptance criteria: NMT 2.0%
