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Significance and Use
Stearic acid is important in the rubber vulcanization process. It is believed that the stearic acid reacts with zinc-oxide or other metallic oxides, during vulcanization, to form a rubber soluble salt or soap, that reacts with the accelerator enabling it to exert its full effect.
Stearic acid of commerce is generally a mixture of palmitic, stearic, and oleic acids usually derived from tallow base stock but can be derived from other fats and oils of animal or vegetable origins.
1.1 This classification covers the compounding materials commercially known as stearic acid.
1.2 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.
D1466 Test Method for Sampling Liquid Oils and Fatty Acids Commonly Used in Paints, Varnishes, and Related Materials
D1951 Test Method for Ash in Drying Oils and Fatty Acids
D1959 Test Method for Iodine Value of Drying Oils and Fatty Acids
D1962 Test Method for Saponification Value of Drying Oils, Fatty Acids, and Polymerized Fatty Acids
D1965 Test Method for Unsaponifiable Matter in Drying Oils, Fatty Acids, and Polymerized Fatty Acids
D1980 Test Method for Acid Value of Fatty Acids and Polymerized Fatty Acids
D1982 Test Method for Titer of Fatty Acids
D1983 Test Method for Fatty Acid Composition by Gas-Liquid Chromatography of Methyl Esters
D4075 Test Methods for Rubber Compounding Materials--Flame Atomic Absorption Analysis--Determination of Metals
ICS Number Code 83.040.20 (Rubber compounding ingredients)
UNSPSC Code 13101607(Rubber compound)
ASTM D4817-88(2012), Standard Classification for Rubber Compounding Materials—Stearic Acid, ASTM International, West Conshohocken, PA, 2012, www.astm.orgBack to Top