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ASTM D4620-02(2012)

Historical Reaffirmation

Standard Test Method for Evaluating the Effective Surface Area of Zinc Oxide in Rubber

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1.1 This test method specifies the standard materials, mixing procedure, and test method for ranking zinc-oxide samples according to their specific surface area in a standard test formula based on chloroprene rubber (CR).

1.2 The ranking is based on the cure time of the standard CR formulation.

1.3 The accurate surface area cannot be determined by this test method, since factors other than surface area may influence the cure times to some extent (for example acidity, heavy metal traces, etc.).

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

1.5 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 and health practices and determine the applicability of regulatory limitations prior to use.

The surface area of zinc-oxide in rubber can significantly affect cure activation and vulcanizate properties.

The specific surface area of zinc-oxide is usually measured by nitrogen absorption which requires the use of equipment not normally found in rubber laboratories. This test method allows a ranking of zinc-oxide samples according to their surface areas with respect to a known standard using a simplified procedure involving mixing of rubber compounds and measuring cure times with oscillating disk or rotorless cure meters.

This test method may be used for quality control, research and development work, and comparison of different zinc-oxide samples.

SDO ASTM: ASTM International
Document Number D4620
Publication Date May 1, 2012
Language en - English
Page Count 2
Revision Level 02(2012)
Supercedes
Committee D11.20
Publish Date Document Id Type View
Dec. 10, 2002 D4620-02 Revision
May 10, 1998 D4620-98 Revision
Nov. 1, 2021 D4620-02R21 Reaffirmation
Feb. 1, 2017 D4620-02R17 Reaffirmation
May 1, 2012 D4620-02R12 Reaffirmation
Nov. 1, 2007 D4620-02R07 Reaffirmation