Glossary of Terms and Acronyms Engineered Crumb Rubber (ECR) The modification of very fine crumbs of tire rubber with chemical treatments that enhance rubber-binder interactions and improve the performance of asphalt mixes. ECR is typically added to hot mix asphalt during production using the dry process method. EPDM Ethylene Propylene Diene Monomer: a synthetic rubber used in a range of applications including various seals used in the automotive and construction industries. Recycled post- industrial EPDM rubber granules mixed with polyurethane is used as a top layer, typically over a recycled tire rubber base, in pour-in-place surfacing. Extruder A machine designed to force a rubber or rubber mix through an orifice, which is often shaped to the geometry of the desired product. (ASTM D1566) Extrusion A process of mechanically forcing material (such as blended crumb rubber) through a confined opening to produce film, strip, tubing, or other shapes. F Feedstock Conversion The process whereby a manufacturer replaces a portion of the raw materials (e.g., virgin rubber, EPDM, plastic, aggregate or other raw material) with recycled tire rubber in the manufacturer of a tire-derived product or use. Fiber Fiber content is approximately 10 – 15% of a passenger, light truck and bias ply tires. Fiber is not found in commercial truck tires. Fiber is mainly made of polyester and nylon and can be used in construction material, absorbent material for cleanups, sound dampening, soil reinforcement and civil engineering projects. Fines Fines are naturally occurring small rubber particles created during the shredding process. Fines pass through a standard size screen on which coarser fragments are retained. For example, a 20-mesh screen may produce a small percentage of material that is smaller than the 20- mesh size. Fluff Fluff in a passenger, light truck or bias ply tire includes fiber as well as other materials like fabric. Fluff is sold to several cement plants in the United States and is used for its high BTU value.
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