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ASTM D1386-98

(Test Method)

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

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

SCOPE
1.1 This test method covers the determination of the acid number of synthetic waxes and natural waxes. The number is obtained by direct titration of the material and indicates the amount of free acid present.  
1.2 This test method, using an ethanol-xylene mixture, is applicable to all natural waxes, including carnauba. The test method is also applicable to oxidized microcrystalline waxes, oxidized Fischer-Tropsch, oxidized polyethylene, and montan esters.  
1.3 This standard does not purport to address all of the safety problems, 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. >

General Information

Status
Historical
Publication Date
09-Sep-1998
ICS
75.140 - Waxes, bituminous materials and other petroleum products
Technical Committee
D21 - Polishes
Drafting Committee
D21.02 - Raw Materials
Current Stage
Ref Project

Relations

Replaced By
ASTM D1386-98(2004) - Standard Test Method for Acid Number (Empirical) of Synthetic and Natural Waxes
Effective Date
01-Sep-2004
Referred By
ASTM D7389-07(2019) - Standard Test Method for Acid Number (Empirical) of Maleic Anhydride (MAH) Grafted Waxes
Effective Date
10-Sep-1998

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ASTM D1386-98 - Standard Test Method for Acid Number (Empirical) of Synthetic and Natural WaxesASTM D1386-98 - Standard Test Method for Acid Number (Empirical) of Synthetic and Natural Waxes
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ASTM D1386-98 - Standard Test Method for Acid Number (Empirical) of Synthetic and Natural Waxes
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Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: D 1386 – 98
Standard Test Method for
1
Acid Number (Empirical) of Synthetic and Natural Waxes
This standard is issued under the fixed designation D 1386; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of 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 6. Reagents and Materials
1.1 This test method covers the determination of the acid 6.1 Purity of Reagents—Reagent-grade chemicals or
number of synthetic waxes and natural waxes. The number is equivalent, as specified in Practice E 200, shall be used in all
obtained by direct titration of the material and indicates the tests.
amount of free acid present. 6.2 Ethanolic Potassium Hydroxide, Standard Solution (0.1
1.2 This test method, using an ethanol-xylene mixture, is N)—Dissolve 6.6 g of potassium hydroxide in 5.6 g of distilled
applicable to all natural waxes, including carnauba. The test water. Dilute with USSD3A denatured ethanol or 95 % ethanol
method is also applicable to oxidized microcrystalline waxes, to 1000 mL. Standardize with 0.1 N hydrochloric acid.
oxidized Fischer-Tropsch, oxidized polyethylene, and montan 6.3 Phenolphthalein Indicator Solution (10 g/litre)—
esters. Dissolve1gof phenolphthalein in 100 mL of USSD3A,
1.3 This standard does not purport to address all of the denatured ethanol or 95 % ethanol.
safety concerns, if any, associated with its use. It is the 6.4 Xylene.
responsibility of the user of this standard to establish appro-
7. Procedure
priate safety and health practices and determine the applica-
7.1 Transfer 1 to2gofthe sample, weighed to the nearest
bility of regulatory limitations prior to use.
0.001 g, to a 250-mL acid-value flask. Add 40 mL of xylene.
2. Referenced Document
Heat on a hot plate or water bath to put the sample into
2.1 ASTM Standards: solution. Occasional swirling may be necessary.
E 200 Practice for Preparation, Standardization, and Stor- 7.2 Add 3 to 5 drops of phenolphthalein indicator solution
age of Standard and Reagent Solutions for Chemical and titrate the hot solution to the first persistent pink color. The
2
Analysis end point is taken when the pink color remains for at least 10
s. Swirl the flask vigorously during the titration. If precipitation
3. Terminology
of waxes occurs during titration, reheat the sample. The
3.1 Definition: titration should be carried out as quickly as possible. Record
3.1.1 acid number or acid value—the number of milligrams
the number of millilitres of standard alkali solution used.
of potassium hydroxide necessary to neutralize1gofthe
NOTE 1—Caution: To
...

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