This standard specifies principle, apparatus, specimen preparation, test procedures and result calculation for determination of the ash content of coking solid products.
This standard is applicable to determination of the ash content of coking solid products machined from high-temperature coal tar.
Note: coking solid products include coal tar pitch, modified coal tar pitch, refined naphthalene, industrial naphthalene, pressed naphthalene and solid coumarone - indene resin.
2 Normative References
The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated reference, subsequent amendments (excluding corrections), or revisions, of any of these publications do not apply to this standard. However, parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies.
GB/T 2000 Coking Solid Products—Sampling
GB/T 2291 Method for Preparation of Coal Tar Pitch Specimens
3 Principle
Weigh out a certain amount of specimens of coking solid products, heat them over soft fire to get rid of most of the volatile matters, and place them in 900℃±10℃ muffle furnace where they are incinerated to constant weight. The percentage of the mass of residues accounting for the mass of specimens is regarded as ash content.
