ASTM-D7389 › Historical Revision Information
Standard Test Method for Acid Number (Empirical) of Maleic Anhydride (MAH) Grafted Waxes
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Scope
1.1 This test method covers the determination of the acid number of maleic anhydride (MAH) grafted waxes. The number is obtained by direct titration of the material and indicates the amount of free acid present.
1.2 This test method is applicable to MAH-grafted waxes because it uses a special sample preparation step (7.1) that is not required for other waxes. The special sample preparation reverses the hydrolysis of acid anhydride that can occur during storage of the wax.
1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.4 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.
Significance and Use
4.1 This test method is used to determine the free acid content of MAH-grafted waxes. The potential hydrolysis of the anhydride functionality of this wax in storage makes them unsuitable for determining free acid content by Test Method D1386. Free acid content is a significant quality control test, and is a determinant of the utility of the wax.
Keywords
acid anhydride function; acid number; free acid; MAH grafted waxes; polish; synthetic waxes; titration; waxes
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15.04 (Soaps and Other Detergents; Polishes; Leather; Resilient Floor Coverings)
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Document Number
ASTM-D7389-07(2012)
Revision Level
2007 R12 EDITION
Status
Superseded
Modification Type
Reapproval
Publication Date
Oct. 15, 2012
Document Type
Test Method
Page Count
2 pages
Committee Number
D21.02