ASTM D4946-89(2008)e1
(Test Method)Standard Test Method for Blocking Resistance of Architectural Paints
Standard Test Method for Blocking Resistance of Architectural Paints
SIGNIFICANCE AND USE
Dry paint often comes in contact with itself especially in window and door areas and, depending on its hardness, the pressure, temperature, humidity, and duration of time the surfaces are in contact, sometimes sticks to itself (blocks). This stringent test method can be used to compare and rate subjectively the resistance of paints to blocking.
SCOPE
1.1 This test method covers an accelerated procedure for evaluating the face-to-face blocking resistance of trades sales paints. This is not to be confused with blocking resistance Test Method D 3003, which is concerned with blocking of industrial coatings on metal substrates, nor with Test Method D 2793 which is concerned specifically with wood product finishes and reports results on a satisfactory or not satisfactory basis, rather than by the degree of blocking tendency as in this test method.
1.2 The values stated in the SI units of measurement are to be regarded as the standard. The values given in parentheses are for information only.
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.
General Information
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Standards Content (Sample)
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´1
Designation: D4946 − 89 (Reapproved2008)
Standard Test Method for
Blocking Resistance of Architectural Paints
This standard is issued under the fixed designation D4946; 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.
´ NOTE—An editorial correction was made in the Terminology section in February 2008.
1. Scope 4. Summary of Test Method
1.1 This test method covers an accelerated procedure for
4.1 Dried paint films are placed face-to-face and a pressure
evaluating the face-to-face blocking resistance of trades sales
of about 127 g/cm (1.8 psi) is applied. These paint films are
paints. This is not to be confused with blocking resistance Test
put into an oven for 30 min to make the test more stringent.
Method D3003, which is concerned with blocking of industrial
After cooling, the blocked panels are peeled apart. The degree
coatings on metal substrates, nor with Test Method D2793
of blocking is rated subjectively for tack or seal using a series
which is concerned specifically with wood product finishes and
of standard descriptive terms corresponding to numerical
reports results on a satisfactory or not satisfactory basis, rather
ASTM values of 10 to 0.
than by the degree of blocking tendency as in this test method.
5. Significance and Use
1.2 The values stated in the SI units of measurement are to
be regarded as the standard. The values given in parentheses
5.1 Dry paint often comes in contact with itself especially in
are for information only.
window and door areas and, depending on its hardness, the
1.3 This standard does not purport to address all of the
pressure, temperature, humidity, and duration of time the
safety concerns, if any, associated with its use. It is the
surfaces are in contact, sometimes sticks to itself (blocks).This
responsibility of the user of this standard to establish appro-
stringent test method can be used to compare and rate
priate safety and health practices and determine the applica-
subjectively the resistance of paints to blocking.
bility of regulatory limitations prior to use.
6. Apparatus
2. Referenced Documents
6.1 Conditioned Room, at 18 to 29.5°C (65 to 85°F) and 40
2.1 ASTM Standards:
to 60 % relative humidity.
D16 TerminologyforPaint,RelatedCoatings,Materials,and
Applications
6.2 Sealed Paper Test Charts, approximately 190 by 280
D2793 Test Method for Block Resistance of Organic Coat-
mm (7.5 by 11 in.).
ings on Wood Panel Substrates
6.3 Applicator Blade, 13 to 15 cm (5 to 6 in.) wide,
D3003 Test Method for Pressure Mottling and Blocking
0.15-mm (6-mil) clearance.
Resistance of Organic Coatings on Metal Substrates
6.4 Oven, 48 to 52°C (115 to 125°F).
3. Terminology
3.1 Definitions: 6.5 Rubber Stoppers, No. 8, 3.2 cm (1.25 in.) smaller
3.1.1 blocking, n—the undesirable sticking together of two diameter.
painted surfaces when pressed together or placed in contact
6.6 Weights, 1000 g.
with each other for an extended period of time, as referenced in
Terminology D16. 6.7 Scissors.
6.8 Aluminum Tray or Pan, flat.
This test method is under the jurisdiction of ASTM Committee D01 on Paint
and Related Coatings, Materials, andApplications and is the direct responsibility of
Subcommittee D01.42 on Architectural Coatings. 7. Procedure
Current edition approved Feb. 1, 2008. Published February 2008. Originally
7.1 Castthepainttobetestedonasealedtestchartusingthe
approved in 1989. Last previous edition approved in 2003 as D4946 – 89 (2003).
DOI: 10.1520/D4946-89R08E01.
applicator blade. Condition coated panels in the conditioned
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
room for seven days.All painted panels should be kept free of
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
grease, oil, or fingerprints since these will affect block resis-
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. tance.
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