ASTM D1146-00
(Test Method)Standard Test Method for Blocking Point of Potentially Adhesive Layers
Standard Test Method for Blocking Point of Potentially Adhesive Layers
SCOPE
1.1 This test method covers the determination of the blocking point of a thermoplastic or a hygroscopic layer or coating of potentially adhesive material. Potentially adhesive materials comprise those materials in a substantially nonadhesive state which may be activated to an adhesive state by application of heat or solvents.
1.2 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.
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Designation:D1146–00
Standard Test Method for
Blocking Point of Potentially Adhesive Layers
This standard is issued under the fixed designation D 1146; 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.
1. Scope is lifted the lower specimen will cling thereto, but may be
parted with no evidence of damage to either surface.
1.1 This test method covers the determination of the block-
3.2.7 second degree blocking—an adherence of such degree
ing point of a thermoplastic or a hygroscopic layer or coating
that when the surfaces under tests are parted one surface or the
of potentially adhesive material. Potentially adhesive materials
other will be found to be damaged.
comprise those materials in a substantially nonadhesive state
which may be activated to an adhesive state by application of
NOTE 1—It is permissible to designate such other degrees of blocking
heat or solvents. as may be agreed upon between the manufacturer and the purchaser of the
adhesive.
1.2 The values stated in SI units are to be regarded as the
standard. The values given in parentheses are for information
4. Significance and Use
only.
4.1 Since some potentially adhesive materials are both
1.3 This standard does not purport to address all of the
thermoplastic and hygroscopic, this test method provides
safety concerns, if any, associated with its use. It is the
means for estimating, on the same material, both thermoplastic
responsibility of the user of this standard to establish appro-
and hygroscopic blocking. Because some requirements are
priate safety and health practices and determine the applica-
more strict than others, two varying degrees of blocking are
bility of regulatory limitations prior to use.
recognized and defined: (1) First degree blocking, and (2)
2. Referenced Documents
Second degree blocking. Two types of blocking are covered:
(1) Cohesive blocking, and (2) Adhesive blocking.
2.1 ASTM Standards:
D 907 Terminology of Adhesives
5. Apparatus and Materials
3. Terminology
5.1 Constant-Temperature Oven, capable of maintaining
temperatures up to 85 61°C (185 6 2°F), and of sufficient size
3.1 Definitions—Many terms in this test method are defined
to hold one or more desiccators of the type described in 5.2.
in Terminology D 907.
5.2 Desiccators, for use as humidity chambers, with a
3.2 Definitions of Terms Specific to This Standard:
minimum diameter of 150 mm (6 in.). The desiccators are
3.2.1 adhesive blocking—the blocking of a potentially ad-
made of glass, with ground flanges and fitting covers. Ground
hesive face and a standard test paper.
edges are clean and well lubricated with stopcock grease.
3.2.2 blocking—the adhesion between touching layers of
5.3 Weights, of 0.45 kg (1 lb) each, having a flat base 645
similar or dissimilar material, such as occurs under moderate
2 2
mm (1 in. ) in area.
pressures during storage or use.
5.4 Glass Plates, of plate glass, measuring 38 by 38 mm
3.2.3 cohesive blocking—the blocking of two similar, po-
1 1
(1 ⁄2 by 1 ⁄2 in.).
tentially adhesive faces.
5.5 Standard Paper—General usage filter paper cut in 1 ⁄2
3.2.4 critical humidity—the lowest humidity at which
1 1
by 38 by 38-mm (1 ⁄2 by 1 ⁄2-in.) squares.
blocking of a given degree occurs.
3.2.5 critical temperature—the lowest temperature at which
NOTE 2—In cases where standard paper is deemed inadequate, a
blocking of a given degree occurs.
different paper, or material other than paper, may be substituted by
3.2.6 first degree blocking—an adherence between the sur- agreement between the manufacturer and the purchaser of the adhesive.
faces under test of such degree that when the upper specimen
6. Materials
6.1 Various Salts, for maintaining constant humidity condi-
This test method is under the jurisdiction of ASTM Committee D-14 on
tions within the desiccators, as follows:
Adhesives and is the direct responsibility of Subcommittee D14.10 on Working
6.1.1 Anhydrous calcium chloride (CaCl ), for low humid-
Properties.
Current edition approved March 10, 2000. Published May 2000. Originally
ity, and
e1
published as D 1146 – 51 T. Last previous edition D 1146 – 88 (1994) .
6.1.2 The following salts, employed in saturated solution:
Annual Book of ASTM Standards, Vol 15.06.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D1146
(1) Thermoplastic (2) Hygroscopic.
Approximate Relative Humidity over
Salt Saturated Solution at 38°C
9.2.2 Adhesive Blocking:
(100°F), %
(1) Thermoplastic (2) Hygroscopic.
A
Sodium dichromate (Na Cr O ·2H O) 50
2 2 7 2
A
Sodium bromide (NaBr) 54 9.3 For thermoplastic blocking, place the above test assem-
A
Sodium nitrite (NaNO)62
blies immediately in a desicc
...
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