Glossary of Terms and Acronyms Page 5 | 27 Buffing Rubber Particulate rubber produced as a byproduct of the buffing operation in the carcass preparation stage of tire retreading, characterized by a wide range of particle sizes that are predominately elongated or acicular in shape. See Particulate Rubber. (ASTM D1566-21). Butadiene Rubber (BR) BR is a synthetic rubber used in various parts of the tire. In the sidewall it helps to improve fatigue due to continuous flexing and in the tread area to improve wear abrasion. Butyl Rubber A general-purpose synthetic elastomer (rubber) produced by copolymerizing isobutylene with small amounts of isoprene. Butyl rubber has a high resistance to chemicals and low permeability to gases. Its permeability to air is 70 percent better than that of natural rubber and for this reason is superior for tire tubes and tubeless tire inner liners. C Calcium Carbonate A chemical compound with the formula CaCO3. It is a raw material found in rocks as the mineral calcite and aragonite, most notably as limestone, and is the main component of eggshells, snail shells and pearls. Calcium carbonate is a low oil absorption ingredient used for carpet backing. Calender Machine with two or more parallel, counter rotating rolls with a controllable, roll-to-roll spacing, rotating at selected surface speeds and controlled temperatures, used for sheeting, laminating, skim coating (topping) and friction coating, to a controlled thickness and/or surface condition. (ASTM D1566 - 21) Calendering A mechanical process used in the manufacturing industry by which either plastic or rubber is pressed into textiles (fabric, tire cord) forming composite sheets. In the calendaring process, fabric and rubber or plastic material is passed through a series of rollers to flatten, smooth and commingle the two or more materials. Calendered sheets can have multiple layers of both the elastomeric and polymer “sandwiched” together. Calibrate To measure against and adjust to a standard. California Air Resources Board (CARB) CARB is charged with protecting the public from the harmful effects of air pollution and developing programs and actions to fight climate change.
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