ASTM D 1512 - 15b Standard Test Methods for Carbon Black - pH Value

Current edition approved Dec. 1, 2015. Published February 2016. Originally approved in 1975. Last previous edition approved in 2015 as D1512 – 15a. — 4 p.
These test methods, Test Method A—Boiling Slurry and Test Method B—Sonic Slurry, are used to indicate the pH of the carbon black surface by measuring the pH of water in contact with the carbon black.
The pH of the carbon black is often used in this industry to indicate the relative acidity or alkalinity of carbon black and will be used in the remainder of these test methods to describe this property.
Test Method A and Test Method B do not always give the same results.