ASTM D1512 Standard Test Methods for Carbon Black - pH Value

ASTM D1512 test, Test Method A-Boiling Slurry and Test Method B-Sonic Slurry is used to indicate the pH of the carbon black surface by measuring the pH of water in contact with carbon black.

The pH of carbon black is often used in this industry to indicate the relative acidity or alkalinity of carbon black and will be used in the rest of these test methods to describe this property. Note 2-Test Method A and Test Method B do not always give the same results.

Key properties of carbon black: the original particle size, structure and surface groups of carbon black will have a great influence on the dispersion. Normally, carbon black has small original particle size, low structure and low volatile content.

The darker the carbon black, the higher its acidity, with a pH between 2.5 and 4.5, and the higher its adsorption capacity. The pH of ordinary carbon black is almost neutral, so its adsorption capacity is not obvious. Since the adsorption capacity of carbon black has a special effect on the drying properties of the coating, the drying rate of the coating film is generally reduced due to the adsorption of the dryer in the paint.

When the PH value of carbon black is below 4, the higher the acidity, the greater the adsorption capacity of the desiccant, and the more pronounced the effect on the anti-drying performance.

Values ​​stated in SI units should be accepted as standard. Values ​​in parentheses are for informational purposes only.

This standard does not purport to address all, if any, safety concerns associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and to determine the applicability of regulatory restrictions prior to use.

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