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ASTM D1994-95(2000)

(Test Method)

Standard Test Method for Determination of Acid Numbers of Hot-Melt Adhesives

Standard Test Method for Determination of Acid Numbers of Hot-Melt Adhesives

SCOPE
1.1 This test method covers the determination of acid numbers of hot-melt adhesives.
1.2 This test method is applicable for hot-melt and hot-melt/acid systems that are soluble under the conditions described. The hot melt must also give light- or medium-colored solutions when dissolved. If this is not the case another method must be used.
1.3 The values stated in SI units are to be regarded as the standard. The values in parentheses are for information only.
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. Specific caution statements are given in Note 1 and Note 2.

General Information

Status
Historical
Publication Date
31-Dec-1999
ICS
83.180 - Adhesives
Technical Committee
D10 - Packaging
Drafting Committee
D10.14 - Tape and Labels
Current Stage
Ref Project

Relations

Replaced By
ASTM D1994-07 - Standard Test Method for Determination of Acid Numbers of Hot-Melt Adhesives
Effective Date
01-May-2007
Referred By
ASTM D6465-99(2016) - Standard Guide for Selecting Aerospace and General Purpose Adhesives and Sealants
Effective Date
01-Jan-2000

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ASTM D1994-95(2000) - Standard Test Method for Determination of Acid Numbers of Hot-Melt AdhesivesASTM D1994-95(2000) - Standard Test Method for Determination of Acid Numbers of Hot-Melt Adhesives
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ASTM D1994-95(2000) - Standard Test Method for Determination of Acid Numbers of Hot-Melt Adhesives
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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 1994 – 95 (Reapproved 2000)
Standard Test Method for
Determination of Acid Numbers of Hot-Melt Adhesives
This standard is issued under the fixed designation D 1994; 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 4.2 Acidic hot-melt adhesives are also quite corrosive to
conventional iron and steel adhesive application equipment.
1.1 This test method covers the determination of acid
The acid number determination will tell an equipment manu-
numbers of hot-melt adhesives.
facturer if corrosion-resistant equipment for an application
1.2 This test method is applicable for hot-melt and hot-melt/
should be recommended. The need for corrosion-resistant
acid systems that are soluble under the conditions described.
equipment will vary depending on the acid number of the
Thehotmeltmustalsogivelight-ormedium-coloredsolutions
hot-melt adhesive and type of metal that will be bonded.
when dissolved. If this is not the case another method must be
used.
5. Reagents
1.3 The values stated in SI units are to be regarded as the
5.1 Potassium Hydrogen Phthalate—pHstandard,driedand
standard. The values in parentheses are for information only.
purified (suitable as an acidimetric standard).
1.4 This standard does not purport to address all of the
5.2 Potassium Hydroxide/Methanol Titrant (0.1 N)—
safety concerns, if any, associated with its use. It is the
Dissolve 6 to7gof potassium hydroxide (KOH) in methanol,
responsibility of the user of this standard to establish appro-
industrial grade, and dilute to 1 Lwith methanol. This solution
priate safety and health practices and determine the applica-
should be standardized before use (see Section 6).
bility of regulatory limitations prior to use. Specific caution
5.3 Phenolphthalein Indicating Solution (2.5 g/L)—
statements are given in Note 1 and Note 2.
Dissolve 0.5 g of phenolphthalein in 200 mL of methanol.
2. Referenced Documents 5.4 Toluene—Reagent grade.
5.5 Deionized Water.
2.1 ASTM Standards:
D 907 Terminology Relating to Adhesives
6. Calibration and Standardization
3. Terminology 6.1 Preparation of Standard Acid Solution—Dissolve 0.25
to 0.35 g of potassium hydrogen phthalate in 100 mL of
3.1 Definitions:
deionized water.
3.1.1 acid number, n—a value describing the total acidity of
6.2 Titration of Standard Acid Solution—Add 2 mL of the
a hot-melt adhesive.
phenolphthalein indicating solution and titrate the entire stan-
3.1.2 hot-melt adhesive, n—an adhesive that is rendered
dardacidsolutionusingthemethanolicKOHsolutionprepared
fluid by heat and forms a bond upon cooling.
in 5.2.
3.1.2.1 Discussion—Ahot-melt adhesive may be applied in
6.3 To calculate the normality of the methanolic KOH, use
any of the following states: molten, powder, or dry film.
the following formula:
3.1.3 Fordefinitionsofotherterms,seeTerminologyD 907.
~g of phthalate! 3 1000
N KOH 5
4. Significance and Use
204.23 ~mL of KOH solution!
4.1 Acidic hot-melt adhesives are useful in many applica-
g of phthalate
tions,astheacidfunctionalitycancontributetobettersubstrate
5 3 4.90
mL of KOH solution
wetting and better adhesion to polar, nonporous surfaces.
7. Procedure
7.1 Dissolve 1.80 to 2.10 g of adhesive in 200 mL of
This test method is under the jurisdiction of ASTM Committee D14 on
Adhesives and is the direct responsibil
...

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This specification covers pressure-sensitive tapes of film, paper, and cloth types, with applications in packaging, box closure, and sealing. Covered in this specification are five types of tape: waterproof, weather-resistant, polyester-backed tape (Type I), water-resistant polyester-backed tape (Type II), water-resistant polypropylene-backed tape (Type III), water-resistant woven-cloth-backed tape (Type IV), and weather-resistant paper-backed tape. The tape shall be manufactured with film, paper, or cloth backing, coated with a smooth and uniformly distributed layer of pressure-sensitive water-insoluble adhesive. The tape shall be in wound into rolls on cores of paper fiber or plastic and shall be free from defects, with the edges clean, straight, and unbroken. Tests for adhesion, break strength, tear resistance, thickness, water-penetration rate, water solubility, water-vapor transmission rate, and weathering shall be performed and shall conform to the requirements specified.
SCOPE
1.1 This specification covers film, paper, and cloth pressure-sensitive tapes used for box closure and sealing.  
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