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Significance and Use
This test method is designed to assess the relative purity of production PPDs. These additives are primarily used as antiozonants for tires and other rubber or polymeric products.
Since the results of this test method are based on area normalization, it assumes that all components are eluted from the column and each component has the same detector response. Although this is not strictly true, the errors introduced are relatively small and much the same for all samples; thus, they can be ignored since the intent of the test method is to establish relative purity.
Although trace amounts of “low boilers” are present in production samples, they are disguised by the solvent peak when using packed columns (Procedure A).
1.1 This test method covers the determination of the purity of Class I, II, and III p-phenylenediamine (PPD) antidegradants as described in Classification D4676 by gas chromatography (GC) detection and area normalization for data reduction.
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 and health practices and determine the applicability of regulatory limitations prior to use.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
D3853 Terminology Relating to Rubber and Rubber Latices--Abbreviations for Chemicals Used in Compounding
D4483 Practice for Evaluating Precision for Test Method Standards in the Rubber and Carbon Black Manufacturing Industries
D4676 Classification for Rubber Compounding Materials--Antidegradants
E260 Practice for Packed Column Gas Chromatography
ISO StandardISO 6472 Rubber Compounding Ingredients--Abbreviations
ICS Number Code 71.040.30 (Chemical reagents)
ASTM D4937-96(2012), Standard Test Method for