Glossary of Terms and Acronyms Page 6 | 27 California Department of Transportation (Caltrans) Caltrans manages more than 50,000 miles of California's highway and freeway lanes, provides inter-city rail services, permits more than 400 public-use airports and special-use hospital heliports, and works with local agencies. Caltrans carries out its mission with six primary programs: Aeronautics, Highway Transportation, Mass Transportation, Transportation Planning, Administration and the Equipment Service Center. Carbon Black A material consisting essentially of elemental carbon in the form of near-spherical colloidal particles and coalesced particle aggregates of colloidal size, obtained by partial combustion or thermal decomposition of hydrocarbons. ASTM D1566 – 21 and D3053 - 20. It is used principally in rubber goods, pigments, and printers’ ink. It is not an inert filler but enhances and reinforces various properties of rubber. It is a primary ingredient in the compounding of tires. Casing A whole used tire generally in a worn state to which additional tread may be attached for the purpose of retreading. Cement, Rubber Adhesive that is either a liquid dispersion or solution of raw or compounded rubber, or both. Char Residue remaining after pyrolysis of a tire. ASTM D3053 - 20 defines char as an unprocessed material which is a low value and may contain steel and textile waste in addition to all the additives from rubber production. It is a fine particulate composed of carbon black, ash, and other inorganic materials such as zinc oxide, carbonates and silicates. Chemical Compounds, 6PPD and 6PPD-quinone (6PPD-q) 6PPD is an organic chemical widely used as a stabilizing additive in rubbers such as NR, SBR and BR, all of which are common in all layers of a vehicle tire but the inner layer. 6PPD, is an effective antioxidant used because of its antiozonant performance (e.g., prevents degradation and cracking of rubber compounds caused by oxygen, ozone and temperature fluctuation). 6PPD-q may form when 6PPD reacts with oxygen and ozone. 6PPD research and proposed alternatives. Chopped Tire A tire cut into randomly sized pieces which have no uniformity.
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