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  • ASTM
    D7389-07(2012) Standard Test Method for Acid Number (Empirical) of Maleic Anhydride (MAH) Grafted Waxes
    Edition: 2012
    $144.00
    Unlimited Users per year

Description of ASTM-D7389 2012

ASTM D7389 - 07(2012)

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

Active Standard ASTM D7389 | Developed by Subcommittee: D21.02

Book of Standards Volume: 15.04




ASTM D7389

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.

1. 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.


2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

ASTM Standards

D1386 Test Method for Acid Number (Empirical) of Synthetic and Natural Waxes

E200 Practice for Preparation, Standardization, and Storage of Standard and Reagent Solutions for Chemical Analysis


Keywords

acid anhydride function; acid number; free acid; MAH grafted waxes; polish; synthetic waxes; titration; waxes;


ICS Code

ICS Number Code 75.140 (Waxes, bituminous materials and other petroleum products)


DOI: 10.1520/D7389-07R12

ASTM International is a member of CrossRef.

ASTM D7389



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