4.1 The carbon black content of an unvulcanized black or oil-black SBR masterbatch may be determined by this test method if an inert (CO₂) atmosphere and a determinate (see Note 2) of known carbon black content are available.

Note 2: Determinate black masterbatch may be prepared by careful addition of exact amounts of rubber and carbon black on a mill. An alternative would be a thorough blending of a quantity of black masterbatch and determination of the carbon black by use of a previously established determinate.

1.1 These test methods cover the determination of the amount of carbon black in a masterbatch and cover emulsion SBR-carbon black mixtures, but may be applicable to other polymers. Three test methods are included:

Sections

Inert Atmosphere Pyrolysis

 3 – 10

Vacuum Pyrolysis

11 – 17

Thermogravimetric Analyzer

18 – 24

Note 1: The nomenclature used in these test methods is in accordance with Practice D1418.

1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.

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

1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.