Astm D 4817 – 88 (Reapproved 1999) pdf free download

Standard Classification for
Rubber Compounding Materials—Stearic Acid1

This standard is issued under the fixed designation D 4817; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of the last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.

1. Scope

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

2.1 ASTM Standards:
D 1466 Test Method for Sampling Liquid Oils and Fatty
Acids Commonly Used in Paints, Varnishes, and Related
D 1951 Test Method for Ash in Drying Oils and Fatty
D 1959 Test Method for Iodine Value of Drying Oils and
Fatty Acids2
D 1962 Test Method for Saponification Value of Drying
Oils, Fatty Acids, and Polymerized Fatty Acids2
D 1965 Test Method for Unsaponifiable Matter in Drying
Oils, Fatty Acids, and Polymerized Fatty Acids2
D 1980 Test Method for Acid Value of Fatty Acids and
Polymerized Fatty Acids2
D 1982 Test Method for Titer of Fatty Acids2
D 1983 Test Method for Fatty Acid Composition by GasLiquid Chromatography of Methyl Esters2
D 4075 Test Methods for Compounding Materials—Flame
Atomic Absorption Technique—Determination of Metals3

3. Significance and Use

3.1 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.

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