Pyrolyx recovered Carbon Black (rCB) is a substitute for Carbon Black in both rubber products (cct-6400 & rC-6400) and plastic black color concentrates (rC-7400). The rCB material is derived from post consumer rubber goods (feedstock) via a “batch” type pyrolysis process. This semi-reinforcing filler consists primarily of Carbon Black but also contains inorganic compounding ingredients (typically 10-20-wt%) originating from the feedstock but is free of wire and fabric. After the initial pyrolysis process the material is then put through the post processing stages of grinding and pelletizing. The specific surface area of this material would be classified under the ASTM standard methodology as ranging from a N400 to N500 series material. rCB exhibits reinforcing properties of Carbon Blacks in the range of N600 to N700 Carbon Blacks. rCB, should not be confused with “Carbon Char” which has minimal to no reinforcing properties when used in rubber compounding.
rCB is primarily used as a substitute for commonly used ASTM semi reinforcing furnace grades of Carbon Black (N550, N650, N660, N762, and N774) in both rubber and plastic end products. The end product in most cases is the determining factor of the amount of rCB that can be substituted without diminishing the final products in performance capacities.
Product Standards Recognition – ASTM
The ASTM Committee D36 on rCB was formed in 2017 to develop standards for rCB and its processes, and to limit confusion with Carbon Char. The Committee focuses on the development of voluntary consensus standards on test methods, practices, technology, grading and guides. Pyrolyx, as the largest global producer of rCB, plays a prominent role in the ASTM Committee and the development of industry standards.