ASTM D3265 – Standard Test Method for Carbon Black—Tint Strength
Description:
Significance and Use
4.1 For the broad range of commercial rubber grade carbon blacks, tint strength is highly dependent upon particle size. Tint strength can be used as an indication of particle size; however, tint strength is also dependent on structure and aggregate size distribution. Therefore, differences in tint strength within grades of carbon black may reflect differences other than particle size.
Note 1: This test method was developed primarily for the characterization of N100, N200, and N300 series carbon blacks.
4.2 Tint strength values within the carbon black industry have been developed using an Automatic Muller apparatus which is used to prepare carbon black-zinc oxide pastes. An alternative mixing apparatus, Hauschild SpeedMixer3,4 (DAC 150 FVZ), and a corresponding procedure have been extensively studied within D24 and shown to provide equivalent tint strength for all carcass or soft blacks. However, tint values for tread and high surface area specialty carbon blacks are typically lower when the SpeedMixer is used to prepare the paste. Therefore, the SpeedMixer should not be used for tread and high surface area specialty carbon blacks, and it is the responsibility of the user of this alternate apparatus to ensure their products will adequately disperse. Disputes arising between a user and producer should be resolved using the Automatic Muller apparatus until ASTM develops adequate precision statements.
4.3 The term ITRB is used in the entire text for both, the original ITRB, used as the first reference material for tint testing, but which is now used up, and the successor reference material, ITRB2.
Scope
1.1 This test method covers the determination of the tint strength of carbon black relative to an industry tint reference black (ITRB).
1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
ASTM D3260