ASTM-D7389 Standard Test Method for Acid Number (Empirical) of Maleic Anhydride (MAH) Grafted Waxes

ASTM-D7389 - 2007 R19 EDITION - CURRENT
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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.

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

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 D 1386. 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; ICS Number Code 75.140 (Waxes, bituminous materials and other petroleum products)

To find similar documents by ASTM Volume:

15.04 (Soaps and Other Detergents; Polishes; Leather; Resilient Floor Coverings)

To find similar documents by classification:

75.140 (Waxes, bituminous materials and other petroleum products Asphalts for building, see 91.100.50 Asphalts for road construction, see 93.080.20)

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Document Number

ASTM-D7389-07R19

Revision Level

2007 R19 EDITION

Status

Current

Modification Type

New

Publication Date

July 1, 2019

Document Type

Test Method

Page Count

2 pages

Committee Number

D21.02