ASTM D 1765 - 06 Standard Classification System for Carbon Blacks Used in Rubber Products

American Society for Testing and Materials (ASTM). Current edition approved Aug. 1, 2006. Published August 2006. Originally
approved in 1965. Last previous edition approved in 2005 as D 1765 – 05ae1. This classification system covers the classification of
rubber-grade carbon blacks by the use of a four-character nomenclature system. The first character gives some indication of the influence of the carbon black on the rate of cure of a typical rubber compound containing the black. The second character gives information on the average surface area of the carbon black. The last two characters are assigned arbitrarily.