ASTM D6252/D6252M-98

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Designation: D 6252/D 6252M – 98
Standard Test Method for
Peel Adhesion of Pressure-Sensitive Label Stocks at a 90°
Angle
This standard is issued under the fixed designation D 6252/D 6252M; 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 D 996 Terminology of Packaging and Distribution Environ-
ments
1.1 This test method covers the measurement of the peel
D 3715/D 3715M Practice for Quality Assurance of
adhesion of pressure-sensitive label stocks. This test method
Pressure-Sensitive Tapes
gives a measure of the adherence to a standard steel substrate
D 4332 Practice for Conditioning Containers, Packages, or
or to other surfaces of interest for a pressure-sensitive label
Packaging Components for Testing
stock.
E 122 Practice for Choice of Sample Size to Estimate a
1.2 This test method provides a means of assessing the
Measure of Quality for a Lot or Process
uniformity of the adhesion of a given type of pressure-sensitive
label stock. The assessment may be within a sheet or roll,
3. Terminology
between sheets or rolls, or between production lots.
3.1 Definitions—Definitions of terms used in this test
1.3 Variations in the label stock facestock and adhesive can
method are in accordance with Terminology D 996.
affect the response; therefore, this test method cannot be used
3.2 Definitions of Terms Specific to This Standard:
to pinpoint the specific cause(s) of nonuniformity.
3.2.1 pressure-sensitive label stock, n—the combination of
1.4 This test method may not be appropriate to test label
facestock (face material), pressure-sensitive adhesive, and
stocks having either stiff backings or backings showing a high
release liner.
stretch at low forces. These characteristics could result in a
high variability of the test response, which is not a true
4. Summary of Test Method
indication of the real nature of the adhesive bond.
4.1 A strip of label stock is applied to a standard test panel,
1.5 The values stated in either SI or inch-pound units are to
or other surface of interest, with controlled pressure. The label
be regarded separately as the standard. The values stated in
stock is peeled from the panel at 90° angle at a specified rate,
each system may not be exact equivalents; therefore, each
during which time the force required to effect peeling is
system must be used independently, without combining values
measured.
in any way.
1.6 This standard does not purport to address all of the
NOTE 1—The pressure-sensitive adhesive (psa) is permanently tacky
safety concerns, if any, associated with its use. It is the and instantly adheres to the surface for which the label stock is designed.
A psa label stock also can be defined as a self-adhering label stock.
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
5. Significance and Use
bility of regulatory limitations prior to use.
5.1 This test method is a tool for quality assurance use.
2. Referenced Documents
Given a pressure-sensitive label stock and a requirement in
terms of the minimum or maximum peel adhesion value
2.1 ASTM Standards:
expected for this label stock, the data from the test can be used
A 666 Specification for Austenitic Stainless Steel, Sheet,
in conjunction with acceptance criteria.
Strip, Plate, and Flat Bar
5.2 This test method can show the relative bond strength of
a given label stock to one or more surfaces of varied material
and texture as compared to the standard stainless steel panel.
This test method is under the jurisdiction of ASTM Committee D-10 on
Packaging and is the direct responsibility of Subcommittee D10.14 on Tape and
Labels.
Current edition approved April 10, 1998. Published September 1998. Annual Book of ASTM Standards, Vol 15.09.
2 4
Annual Book of ASTM Standards, Vol 01.03. Annual Book of ASTM Standards, Vol 14.02.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D 6252/D 6252M
Substitution of panels representative of the proposed substrates within 20 % of the scale maximum. An autographic device for
for the standard stainless steel panel would be acceptable for recording peel force shall be provided. Capability of intergrat-
this procedure. ing areas under the peel force recordings shall be optional.
6. Apparatus
7. Reagents and Materials
6.1 Specimen Cutter —The specimen cutter shall hold two 7.1 Purity of Reagents—Reagent grade chemicals shall be
single-edged razor blades in parallel planes, a precise distance
used in all tests. Unless otherwise indicated, it is intended that
apart, to form a cutter of exact specimen width. all reagents conform to the specifications of the Committee on
Analytical Reagents of the American Chemical Society, where
NOTE 2—A 25.4-mm or 1-in. cutter shall consist of a 25.4-mm or 1-in.
such specifications are available. Other grades may be used,
thick by 200-mm or 8-in. length of aluminum bar stock 25.4 mm or 1 in.
provided it is first ascertained that the reagent is of sufficiently
wide. The edges for about 125 mm or 5 in. from one end shall be slightly
rounded to form a handle. The width of the bar for 75 mm or 3 in. from high purity to permit its use without lessening the accuracy of
the opposite end shall be narrowed to exactly 25.4 mm or 1 in. minus the
the determination.
thickness of a single-edged razor blade (one of two used as cutting edges).
7.2 Solvents:
The razor blades shall be held in position using side plates. The end of the
7.2.1 Diacetone Alcohol, non-residual, technical grade or
cutter shall be cut away at 0.74 Rad or 45° angle to expose the cutting
better.
edge at one end of the blades.
7.2.2 One of the following:
6.2 Dispensing System for Solvents—Use plastic wash
7.2.2.1 Acetone.
bottles.
7.2.2.2 Ethyl Acetate.
6.3 Panel —A 50 by 125-mm no less than 1.1-mm thick-
7.2.2.3 Isopropyl Alcohol (IPA).
ness ora2by 5-in. panel no less than 0.043-in. thickness
7.2.2.4 Methyl Alcohol, (95 %).
stainless steel 302 or 304 in accordance with Specification
7.2.2.5 Methyl Ethyl Ketone (MEK).
A 666 having a bright-annealed finish. The surface roughness
7.2.2.6 Methyl Isobutyl Ketone (MIBK).
height shall be 50 6 5-nm or 2.0 6 0.2-uin. arithmetical
7.2.2.7 n-Heptane.
average deviation from the mean line. Panels showing stains,
7.2.3 Where toxicity and flammability requirements are
discoloration, or numerous scratches are not acceptable.
paramount, a mixture of n-heptane and a fluorinated hydrocar-
6.4 Roller , mechanically-operated.
bon, such as refrigerant, may meet the requirements. Normally,
6.4.1 A steel roller 85 6 2.5 mm or 3.25 6 0.1 in. in
cleaning procedures, including use of the solvents in 7.2,
diameter and 45 6 1.5 mm or 1.75 6 0.05 in. in width, covered
cannot be used on porous or solvent-sensitive materials.
by rubber approximately 6.5 mm or 0.25 in. in thickness,
7.3 Cleaning Material, absorbent, either surgical gauze or
having a Shore Scale A durometer hardness of 80 6 5. The
tissue. To be suitable, materials must be lint-free during use,
surface shall be a true cylinder void of any convex or concave
absorbent, contain no additives that are soluble in the solvents
deviations. The mass of the roller shall be 2040 6 45gor4.5
listed in 7.2, and be made without contaminants.
6 0.1 lb.
6.4.2 No part of the apparatus shall increase the mass
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