This International Standard establishes a general specification for acrylonitrile-butadiene-styrene (or substituted styrene) for pipes and fittings. The values given shall not be used for design purposes. This International Standard does not apply to a) materials containing less than 20 % acrylonitrile in the continuous phase; b) materials containing more than 5 % of another comonomer or polymer in the continuous phase; c) materials containing flame retardants; d) materials containing fibres.