[1] Due to its micron size, MRP can be incorporated into multiple polymers, and provides a smooth surface appearance on finished products.
In some cases, in order to improve compatibility with host materials, the MRP is given a chemical treatment to activate, or “make functional” the surface of the powder particles.
[4] MRP is used as a compound extender to offset the use of natural rubber and synthetic polymers as well as act as a process aid in material production.
Currently, the leading producer of MRP is Lehigh Technologies, which utilizes a cryogenic turbo mill process with more than 100 million pounds of annual production capacity.
Numerous U.S. and European studies have found crumb rubber and MRP meet standards for human health and safety.
[12] Recently, an EPA study found that crumb rubber in field turfs and playgrounds contained concentrations of materials below harmful levels.