ASTM D1386-15
(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
SIGNIFICANCE AND USE
4.1 This test method is used to determine the property of acid functionality. Acid functionality determines the utility of the wax as well as being a significant Quality Control test.
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 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.
General Information
Buy Standard
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: D1386 − 15
Standard Test Method for
1
Acid Number (Empirical) of Synthetic and Natural Waxes
This standard is issued under the fixed designation D1386; 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 (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope 5. Apparatus
1.1 This test method covers the determination of the acid
5.1 Analytical Balance.
number of synthetic waxes and natural waxes. The number is
5.2 Buret, 50-mL, with 0.1-mL graduations.
obtained by direct titration of the material and indicates the
amount of free acid present. 5.3 Flasks, acid value, 250-mL.
1.2 This test method, using an ethanol-xylene mixture, is
6. Reagents and Materials
applicable to all natural waxes, including carnauba. The test
method is also applicable to oxidized microcrystalline waxes,
6.1 Purity of Reagents—Reagent-grade chemicals or
oxidized Fischer-Tropsch, oxidized polyethylene, and montan
equivalent, as specified in Practice E200, shall be used in all
esters.
tests.
1.3 The values stated in SI units are to be regarded as
6.2 Ethanolic Potassium Hydroxide, Standard Solution—
standard. No other units of measurement are included in this
Dissolve approximately 5.6 g of potassium hydroxide in 5.6 g
standard.
of distilled water. Dilute with USSD3A denatured ethanol or
1.4 This standard does not purport to address all of the
95 % ethanol to 1000 mL. Standardize with 0.1 N hydrochloric
safety concerns, if any, associated with its use. It is the acid.
responsibility of the user of this standard to establish appro-
6.3 Phenolphthalein Indicator Solution (10 g/litre)—
priate safety and health practices and determine the applica-
Dissolve1gof phenolphthalein in 100 mL of USSD3A,
bility of regulatory limitations prior to use.
denatured ethanol or 95 % ethanol.
2. Referenced Document
6.4 Xylene.
2
2.1 ASTM Standards:
E200 Practice for Preparation, Standardization, and Storage
7. Procedure
of Standard and Reagent Solutions for ChemicalAnalysis
7.1 Transfer 1 to2gofthe sample, weighed to the nearest
3. Terminology
0.001 g, to a 250-mL acid-value flask. Add 40 mL of xylene.
Heat on a hot plate or water bath to put the sample into
3.1 Definitions:
solution. Occasional swirling may be necessary.
3.1.1 acid number or acid value—the number of milligrams
of potassium hydroxide necessary to neutralize1gofthe
7.2 Add 3 to 5 drops of phenolphthalein indicator solution
sample.
and titrate the hot solution to the first persistent pink color.The
end point is taken when the pink color remains for at least 10 s.
4. Significance and Use
Swirl the flask vigorously during the titration. If precipitation
4.1 This test method is used to determine the property of
of waxes occurs during titration, reheat the sample. The
acid functionality. Acid functionality determines the utility of
titration should be carried out as quickly as possible. Record
the wax as well as being a significant Q
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: D1386 − 10 D1386 − 15
Standard Test Method for
1
Acid Number (Empirical) of Synthetic and Natural Waxes
This standard is issued under the fixed designation D1386; 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 (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. 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 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 Document
2
2.1 ASTM Standards:
E200 Practice for Preparation, Standardization, and Storage of Standard and Reagent Solutions for Chemical Analysis
3. Terminology
3.1 Definitions:
3.1.1 acid number or acid value—the number of milligrams of potassium hydroxide necessary to neutralize 1 g of the sample.
4. Significance and Use
4.1 This test method is used to determine the property of acid functionality. Acid functionality determines the utility of the wax
as well as being a significant Quality Control test.
5. Apparatus
5.1 Analytical Balance.
5.2 Buret, 50-mL, with 0.1-mL graduations.
5.3 Flasks, acid value, 250-mL.
6. Reagents and Materials
6.1 Purity of Reagents—Reagent-grade chemicals or equivalent, as specified in Practice E200, shall be used in all tests.
6.2 Ethanolic Potassium Hydroxide, Standard Solution (0.1 N)—Solution—Dissolve 6.6 approximately 5.6 g of potassium
hydroxide in 5.6 g of distilled water. Dilute with USSD3A denatured ethanol or 95 % ethanol to 1000 mL. Standardize with 0.1
N hydrochloric acid.
6.3 Phenolphthalein Indicator Solution (10 g/litre)—Dissolve 1 g of phenolphthalein in 100 mL of USSD3A, denatured ethanol
or 95 % ethanol.
6.4 Xylene.
1
This test method is under the jurisdiction of ASTM Committee D21 on Polishes and is the direct responsibility of Subcommittee D21.02 on Raw Materials.
Current edition approved May 1, 2010Oct. 1, 2015. Published June 2010October 2015. Originally approved in 1955 as D1386 – 55 T. Last previous edition approved in
20042010 as D1386 – 98D1386 – 10.(2004). DOI: 10.1520/D1386-10.10.1520/D1386-15.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM St
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.