Glossary of Terms and Acronyms Page 17 | 27 P Particulate Rubber Rubber vulcanized or un-vulcanized, that has been transformed into a collection of particles, with or without a coating of a partitioning agent to prevent agglomeration during production, transportation, or storage. See buffing rubber, granulated rubber, ground rubber and powdered rubber. (ASTM 1566 – 21) Passenger tire equivalent (PTE): Defined as 20 pounds of tire rubber for the purpose of making consistent comparisons in this and other reports. (The actual weight of waste passenger tires may vary considerably.) Polymer Modified Binder A binder material produced by blending and reacting small amounts of un-vulcanized synthetic rubber (referred to as “polymers”) with liquid asphalt at high temperatures for extended periods. The resulting modified binder is incorporated as a cement in asphalt paving or surfacing applications. Polymer modification increases pavement rutting and cracking resistance. Post-Consumer Scrap Scrap materials, normally source separated, that no longer have value for which they were originally intended but can have potential reuse value as a raw material in new product applications. Post Industrial Scrap Scrap materials, normally source separated, that are a by-product of the manufacturing process. When properly processed can be reused in the manufacturing process or used for new product applications. Powdered Rubber Particulate rubber composed mainly of non-spherical particles that have a maximum particle dimension equal or below 425 microns (40 mesh). ASTM 1566-21. Primary Shredding Method of processing whole scrap tires into rough shreds to reduce the volume for further processing. Pulverized Rubber material that has been crushed, pounded or ground to smaller particles.
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