The proposed test method aims to cut down testing time for ash content. 

Aug 13, 2025

ASTM International’s recovered carbon black (rCB) committee (D36) is developing a proposed standard (WK91069) that will help enable a manufacturer to significantly improve their production process monitoring abilities and improve productivity. WK91069 is under development within the committee’s recovered carbon black subcommittee (D36.10). 

According to ASTM member Pieter Ter Haar, the proposed standard is specifically for recovered carbon black (rCB).

“The method currently used, which has been adopted from ASTM’s carbon black committee (D24), results in a testing time that can take up to 18 hours,” says Ter Haar, director of rCB at Circtec. “This is very inconvenient for producers for whom this is an important quality parameter.”

Ter Haar adds that the proposed standard can reduce the testing period to only a few hours, significantly improving the ability to make process adjustments and reducing potentially off-spec material. For end-users it will become much easier and faster to obtain results.

ASTM welcomes participation in the development of its standards. Become a member at JOIN ASTM.

United Nations Sustainable Development Goals Supported: