Objective of the question is to increase the share of recycled rubber powder and not to get a substantial decline of certain chemical and mechanical properties. The application should be in NR / SBR / BR blends. I would like to exlude the plasma modification that has disadvantages because the short time that it should be applied in rubber blends.
In the 80's the talk was about doing Cryogenic grinding and then adding 10-20%. With today's ability for fine grinding to nano particulate sizes, perhaps the blend portion can be revised upwards
Looked into this around 2002. The supply of recycled crumb far outweighs the demand so recyclers were landfilling most, and probably still are. Some states still require its use in state highways to help prop up demand. Oregon Rubber Mills should have some expertise in-house.
http://www.oregonrubbermills.com/aboutus.html
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