M00001387
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ISO 4656 2nd Edition, July 15, 2012 Rubber compounding ingredients - Carbon black - Determination of oil absorption number (OAN) and oil absorption number of compressed sample (COAN)
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Availability date: 07/13/2021
Description / Abstract:
Oil absorption number (OAN) is a measure of the ability of a
carbon black to absorb liquids. This property is a function of the
structure of the carbon black. Either dibutyl phthalate (DBP) or
paraffin oil is acceptable for use with standard pelleted grades,
including N-series carbon blacks found in ASTM D1765, although OAN
testing using paraffin oil on some speciality blacks and powder
blacks might result in unacceptable differences as compared to OAN
testing using DBP oil. While studies have shown the two oils to
give comparable precision, paraffin oil offers the advantage of
being non-hazardous.
This International Standard specifies a method using an
absorptometer for the determination of the oil absorption number of
carbon black for use in the rubber industry.
The same method is used for the determination of the oil
absorption number of compressed samples of carbon black. The
procedure for the preparation of the compressed samples is
described in Annex A.