ASTM D1639-90(1996)e1

Standard Test Method for Acid Value of Organic Coating Materials (Withdrawn 2005)

SCOPE
1.1 This test method covers the measurement of the free acidity present in the nonvolatile portion of varnishes, oils, certain resins, and paint vehicles, by the reaction with standard alkali solution.  
1.2 If carboxylic anhydrides are present, only one half of the reactive groups will be titrated and indicated by this test method.  
1.3 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.
WITHDRAWN RATIONALE
This test method covers the measurement of the free acidity present in the nonvolatile portion of varnishes, oils, certain resins, and paint vehicles, by the reaction with standard alkali solution.
Formerly under the jurisdiction of Committee D01 on Paint and Related Coatings, Materials, and Applications, this test method was withdrawn in June 2005 in accordance with section 10.5.3.1 of the Regulations Governing ASTM Technical Committees, which requires that standards shall be updated by the end of the eighth year since the last approval date.

General Information

• Status: Withdrawn
• Publication Date: 31-Dec-1995
• Withdrawal Date: 30-Jun-2005
• ICS: 25.220.60 - Organic coatings
• Technical Committee: D01 - Paint and Related Coatings, Materials, and Applications
• Drafting Committee: D01.33 - Polymers and Resins

Relations

• Referred By: ASTM D4142-89(2022) - Standard Guide for Testing Epoxy Resins
• Effective Date: 01-Jan-1996

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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
e1
Designation:D1639–90(Reapproved 1996)
Standard Test Method for
Acid Value of Organic Coating Materials
This standard is issued under the fixed designation D 1639; 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.
This standard has been approved for use by agencies of the Department of Defense.
e NOTE—Keywords were added editorially in October 1996.
1. Scope resins, and paint vehicles by the reaction with a standard alkali
solution. Use of this test method provides a means whereby the
1.1 This test method covers the measurement of the free
relative applicability of the varnish, oil, resin, or paint vehicle
acidity present in the nonvolatile portion of varnishes, oils,
to the particular end use may be estimated by the buyer and the
certain resins, and paint vehicles, by the reaction with standard
seller.
alkali solution.
4.2 This test method also provides a convenient method of
1.2 Ifcarboxylicanhydridesarepresent,onlyonehalfofthe
process control for the manufacture of certain resins and paint
reactive groups will be titrated and indicated by this test
vehicles designed to meet particular requirements of the buyer
method.
and the seller.
1.3 This standard does not purport to address the safety
concerns, if any, associated with its use. It is the responsibility
5. Reagents and Solvents
of the user of this standard to establish appropriate safety and
5.1 Purity of Reagents—Reagent grade chemicals shall be
health practices and determine the applicability of regulatory
used in all tests. Unless otherwise indicated, it is intended that
limitations prior to use.
all reagents shall conform to the specifications of the Commit-
2. Referenced Documents tee onAnalytical Reagents of theAmerican Chemical Society,
where such specifications are available. Other grades may be
2.1 ASTM Standards:
used, provided it is first ascertained that the reagent is of
D 362 Specification for Industrial Grade Toluene
sufficiently high purity to permit its use without lessening the
D 770 Specification for Isopropyl Alcohol
accuracy of the determination.
D 1259 Test Methods for Nonvolatile Content of Resin
5.2 Phenolphthalein Indicator Solution (10 g/L)—Dissolve
Solutions
1 g of phenolphthalein in 100 mL of methanol, ethanol, or
D 1644 Test Methods for Nonvolatile Content ofVarnishes
5 isopropranol.
D 1960 Test Method for Loss on Heating of Drying Oils
5.3 Potassium Hydroxide, Methyl Alcohol (Methanol) Solu-
3. Terminology tion (1 mL 5 5.6 mg KOH)—Dissolve 6.6 g of potassium
hydroxide(KOH)in1Lofmethylalcohol.Standardizeagainst
3.1 Definitions:
National Institute of Standards and Technology standard po-
3.1.1 acid value—the number of milligrams of potassium
tassium hydrogen phthalate Standard Reference No. 84, using
hydroxide (KOH) required to neutralize the alkali-reactive
phenolphthalein as the indicator (5.2). Do not adjust the
groups in1gof material under the conditions of test (see 6.4).
concentration of the solution, but calculate the milligrams of
4. Significance and Use
KOH per litre of solution, K. (See Note.)
4.1 This test method is used to determine the free acidity
NOTE 1—At the discretion of the purchaser and the seller, an aqueous
present in the nonvolatile portion of varnishes, oils, certain
solution of potassium hydroxide of 0.1 N or 0.5 N may be used.
NOTE 2—Potassium hydroxide, methyl alcohol (methanol) solution
may be purchased from most major laboratory chemical supplier houses.
This material should be standardized as just indicated.
This test method is under the jurisdiction of ASTM Committee D-1 on Paint
and Related Coatings, Materials, andApplications, and is the direct responsibility of
Subcommittee D01.33 on Polymers and Resins.
Current edition approved Oct. 26, 1990. Published
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