GB/T 13021-1991 Determination of carbon black content in polyethylene pipes and fittings (thermogravimetric method)

This standard specifies the determination method of carbon black content in polyethylene pipes and fittings.
This standard applies to polyethylene pipes and fittings, and also applies to the determination of carbon black content of polyolefin pipes and fittings and raw materials used in the manufacture of pipes and fittings.