ASTM D7389-07
Standard Test Method for Acid Number (Empirical) of Maleic Anhydride (MAH) Grafted Waxes

Standard No.

ASTM D7389-07

Release Date

2007

Published By

American Society for Testing and Materials (ASTM)

Status

Be replaced

Replace By

ASTM D7389-07(2012)

Latest

ASTM D7389-07(2019)

Scope

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.

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.

ASTM D7389-07 Referenced Document

• ASTM D1386 Standard Test Method for Acid Number (Empirical) of Synthetic and Natural Waxes
• ASTM E200 Standard Practice for Preparation, Standardization, and Storage of Standard and Reagent Solutions for Chemical Analysis

ASTM D7389-07 history

• 2019 ASTM D7389-07(2019) Standard Test Method for Acid Number (Empirical) of Maleic Anhydride (MAH) Grafted Waxes
• 2007 ASTM D7389-07(2012) Standard Test Method for Acid Number (Empirical) of Maleic Anhydride (MAH) Grafted Waxes
• 2007 ASTM D7389-07 Standard Test Method for Acid Number (Empirical) of Maleic Anhydride (MAH) Grafted Waxes