![]() No.1 - Tire Granule shall consist of granulated tire crumb, Black Only Guaranteed MetalFree, sized. Retreaders tire buffings shall consist of clean, fresh, dry buffings from tire retread preparation operations. The following are common classifications of crumb rubber: Crumb rubber is also used as ground cover under playground equipment, and as a surface material for running tracks and athletic fields. Rubberized asphalt is the largest market for crumb rubber in the United States, consuming an estimated 220 million pounds (100 kt), or approximately 12 million tires annually. This reduced major injuries compared to AstroTurf. The tire crumbs are poured in between the artificial grass blades, giving the artificial fields more cushion and support. A new artificial turf system was developed in the early 2000s based on "crumb rubber." The black crumbs are small pieces of styrene-butadiene rubber made from grinding up old vehicle tires. Athletes did not like playing on these fields because of the risk of injury due to the hard surface. It was later named " AstroTurf" when it was installed in the Houston Astrodome in 1966. The first synthetic grass was placed over concrete in 1964 and became known as “Chem Grass”. Crumb rubber is often used in artificial turf as cushioning. The granulate is sized by passing through a screen, the size based on a dimension (1/4 inch) or mesh (holes per inch : 10, 20, etc.). The particles are sized and classified based on various criteria including color (black only or black and white). Continued processing with a granulator or cracker mill, possibly with the aid of cryogenics or by mechanical means, reduces the size of the particles further. During the recycling process, steel and tire cord (fluff) are removed, leaving tire rubber with a granular consistency. Crumb rubber coating on the concrete of the urban beach splash pad within the municipal swimming baths at High Park in Toronto.Ĭrumb rubber is recycled rubber produced from automotive and truck scrap tires.
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