ASTM D 1765 - 17 Standard Classification System for Carbon Blacks Used in Rubber Products

Current edition approved May 1, 2017. Published May 2017. Originally approved in 1965. Last previous edition approved in 2016 as D1765 – 16. — 4 p.
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.