BS 2782-4:Method 470B:1999

1 Scope
2 Normative reference
3 Principle
3.1 Unfilled materials
3.2 Filled and glass-fibre reinforced materials
3.3 Flame-retardant materials reinforced with glass fibre
4 Reagents (method C or method A in the presence of DBB)
5 Apparatus
6 Procedure
6.1 Test portion
6.2 Unfilled materials
6.3 Filled and glass-fibre reinforced materials
6.4 Materials reinforced with glass fibre containing flame-retardant
     antimony trioxide and/or other volatilizable additives
7 Expression of results
8 Precision
9 Test report

Defines methods determining ash of poly(ethylene terephthalates), poly(butylene terephthalate) and copolymers of the two, both filled and unfilled. Applicable for filled and glass-fibre reinforced materials,as in method A, and unfilled materials in methods A or C of ISO 3451-1:1997. For glass-fibre filled materials, containing flame retardant, antimony trioxide, and/or other, volitilizable additives, for instance pigment zinc sulfide, a modification is incorporated to remove these as volatile bromine component(s).

This part of ISO 3451 specifies methods for determination of the ash of poly(ethylene terephthalate), poly(butylene terephthalate) and copolymers of the two, both filled and unfilled. The general procedures given in ISO 3451-1 are followed. For unfilled materials method A or method C of ISO 3451-1:1997 is used. For filled and glass-fibre reinforced materials method A of ISO 3451-1:1997 is used.

For glass-fibre filled materials, containing flame retardant, antimony trioxide, and/or other, volatilizable additives, for instance pigment zinc sulfide, a modification is incorporated to remove these as volatile bromine component(s).