ASTM D1146-00(2013)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: D1146 − 00 (Reapproved 2013)
Standard Test Method for
Blocking Point of Potentially Adhesive Layers
This standard is issued under the fixed designation D1146; 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 Department of Defense.
1. Scope 3.2.4 critical humidity, n—the lowest humidity at which
blocking of a given degree occurs.
1.1 This test method covers the determination of the block-
3.2.5 critical temperature, n—the lowest temperature at
ing point of a thermoplastic or a hygroscopic layer or coating
which blocking of a given degree occurs.
of potentially adhesive material. Potentially adhesive materials
comprise those materials in a substantially nonadhesive state
3.2.6 first degree blocking, n—an adherence between the
which may be activated to an adhesive state by application of
surfaces under test of such degree that when the upper
heat or solvents.
specimen is lifted the lower specimen will cling thereto, but
may be parted with no evidence of damage to either surface.
1.2 The values stated in SI units are to be regarded as the
standard. The values given in parentheses are for information
3.2.7 second degree blocking, n—an adherence of such
only.
degreethatwhenthesurfacesundertestsarepartedonesurface
or the other will be found to be damaged.
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
NOTE 1—It is permissible to designate such other degrees of blocking
responsibility of the user of this standard to establish appro-
as may be agreed upon between the manufacturer and the purchaser of the
adhesive.
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
4. Significance and Use
2. Referenced Documents 4.1 Since some potentially adhesive materials are both
thermoplastic and hygroscopic, this test method provides
2.1 ASTM Standards:
means for estimating, on the same material, both thermoplastic
D907 Terminology of Adhesives
and hygroscopic blocking. Because some requirements are
more strict than others, two varying degrees of blocking are
3. Terminology
recognized and defined: (1) First degree blocking, and (2)
3.1 Definitions—Many terms in this test method are defined
Second degree blocking. Two types of blocking are covered:
in Terminology D907.
(1) Cohesive blocking, and (2) Adhesive blocking.
3.2 Definitions of Terms Specific to This Standard:
5. Apparatus and Materials
3.2.1 adhesive blocking, n—the blocking of a potentially
adhesive face and a standard test paper.
5.1 Constant-Temperature Oven, capable of maintaining
3.2.2 blocking, n—the adhesion between touching layers of temperaturesupto85 61°C(185 62°F),andofsufficientsize
to hold one or more desiccators of the type described in 5.2.
similar or dissimilar material, such as occurs under moderate
pressures during storage or use.
5.2 Desiccators, for use as humidity chambers, with a
3.2.3 cohesive blocking, n—the blocking of two similar, minimum diameter of 150 mm (6 in.). The desiccators are
potentially adhesive faces.
made of glass, with ground flanges and fitting covers. Ground
edges are clean and well lubricated with stopcock grease.
5.3 Weights, of 0.45 kg (1 lb) each, having a flat base 645
This test method is under the jurisdiction of ASTM Committee D14 on
2 2
mm (1 in. ) in area.
Adhesives and is the direct responsibility of Subcommittee D14.10 on Working
Properties.
5.4 Glass Plates, of plate glass, measuring 38 by 38 mm
Current edition approved Oct. 1, 2013. Published October 2013. Originally
1 1
(1 ⁄2 by 1 ⁄2 in.).
approved in 1951. Last previous edition approved in 2007 as D1146 – 00 (2007).
DOI: 10.1520/D1146-00R13.
5.5 Standard Paper—General usage filter paper cut in by 38
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
1 1
by 38-mm (1 ⁄2 by 1 ⁄2-in.) squares.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
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D1146 − 00 (2013)
NOTE 2—In cases where standard paper is deemed inadequate, a
(1-lb) weight (5.3) on top of the aligned specimens, in the
different paper, or material other than paper, may be substituted by 1
center of the 38-mm (1 ⁄2-in.) square area.
agreement between the manufacturer and the purchaser of the adhesive.
9.2 Make triplicate assemblies for each of the following
types of test:
6. Materials
9.2.1 Cohesive Blocking: (1) Thermoplastic (2) Hygro-
6.1 Various Salts, for maintaining constant humidity condi-
scopic.
tions within the desiccators, as follows:
9.2.2 Adhesive Blocking: (1) Thermoplastic (2) Hygro-
6.1.1 Anhydrous calcium chloride (CaCl ), for low
scopic.
humidity, and
9.3 For thermoplastic blocking, place the above test assem-
6.1.2 The following salts, employed in
...