Glossary of Terms and Acronyms Page 12 | 27 Gasification Any chemical or heat process used to convert rubber to gas. Green Tire A built tire (new or retreaded) before being cured. Generator Any person or business entity who produces or accumulates worn or scrap tires through personal use or in the ordinary course of business. Granulated Rubber Particulate rubber composed of mainly non-spherical particles that span a broad range of maximum “particle dimension” from 425 μm (40 mesh) to 12 mm (0.47 in.); the key feature of this type of particulate rubber is the fraction of the material in the greater than 1-mm (0.08-in.) up to 12-mm (0.47-in.) maximum “particle dimension” range. (ASTM 1566-21) Granulator A high-speed machine used predominately for processing wire free tire chips at ambient temperature. The machine consists of flat rotating knives that come in very close contact with stationary knives. This interaction creates a cutting and tearing process best suited for liberating the fiber from the tire rubber and reducing the size. An internal interchangeable screen consisting of round holes is used to control the size of the rubber produced. Granulators are best suited for processing wire free rubber from 1-inch (25mm) and below to ½- inch (12mm) and ¼- inch (6mm) sizes. Ground Rubber Tire-derived material greater than ¼ inch and up to 1 inch in size, sometimes referred to as nuggets depending on the specification and application. Ground Tire Rubber (GTR) A granular reduction of vulcanized tire rubber that typically has the wire removed. Ground tire rubber has become the preferred term used for rubberized asphalt applications. H Hammermill A high-speed machine used predominately for processing wire free tire rubber that has been frozen. The machine consists of rotating hammers that impact material at high velocity against a grate. The hammer size, speed and velocity as well as the openings between the grates control the size of the rubber produced. A hammermill is best suited for reducing tire rubber from 1 inch (25MM) and below sizes down to 100 mesh.
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