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This Document Has Been Superseded
A newer publication replaces it: BSI BS 144-1, BSI BS 144-2
Specification for coal tar creosote for the preservation of timber
This British Standard specifies requirements for four types of coal tar creosote for wood preservation.
Type 1 creosote is intended for treatment of timber by pressure impregnation.
Type 2 creosote is also intended for pressure impregnation, but has a more closely defined distillation range and a more restricted residue content than creosote of type 1. Type 2 creosote is especially suitable for treatment of poles for overhead power and telecommunication lines, and for structural timbers where bleeding in service could present a problem.
Type 3 creosote is intended for treatment of timber by immersion and brushing.
Type 4 creosote is intended for treatment of timber by pressure impregnation at temperatures > 100 °C. This creosote excludes the lower boiling fractions allowable in the other three creosote types and is especially suitable where volatility leading to odour is a problem.
NOTE. Creosote of types 1, 2 and 3 may be used for the hot-and-cold open tank process.
Requirements for four types of coal tar creosote for wood preservation.
Some test methods are included together with guidance on the methods of treatment of timber.
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