ASTM D4946-89(2003)
(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 describes 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.
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Designation:D4946–89(Reapproved2003)
Standard Test Method for
Blocking Resistance of Architectural Paints
This standard is issued under the fixed designation D 4946; 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 put into an oven for 30 min to make the test more stringent.
After cooling, the blocked panels are peeled apart. The degree
1.1 This test method describes an accelerated procedure for
of blocking is rated subjectively for tack or seal using a series
evaluating the face-to-face blocking resistance of trades sales
of standard descriptive terms corresponding to numerical
paints. This is not to be confused with blocking resistance Test
ASTM values of 10 to 0.
MethodD 3003,whichisconcernedwithblockingofindustrial
coatings on metal substrates, nor with Test Method D 2793
5. Significance and Use
which is concerned specifically with wood product finishes and
5.1 Dry paint often comes in contact with itself especially in
reports results on a satisfactory or not satisfactory basis, rather
window and door areas and, depending on its hardness, the
than by the degree of blocking tendency as in this test method.
pressure, temperature, humidity, and duration of time the
1.2 The values stated in the SI units of measurement are to
surfaces are in contact, sometimes sticks to itself (blocks).This
be regarded as the standard. The values given in parentheses
stringent test method can be used to compare and rate
are for information only.
subjectively the resistance of paints to blocking.
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
6. Apparatus
responsibility of the user of this standard to establish appro-
6.1 Conditioned Room, at 18 to 29.5°C (65 to 85°F ) and 40
priate safety and health practices and determine the applica-
to 60 % relative humidity.
bility of regulatory limitations prior to use.
6.2 Sealed Paper Test Charts, approximately 190 by 280
2. Referenced Documents mm (7.5 by 11 in.).
6.3 Applicator Blade, 13 to 15 cm (5 to 6 in.) wide,
2.1 ASTM Standards:
0.15–mm (6–mil) clearance.
D 16 Terminology for Paint, Related Coatings, Materials,
2 6.4 Oven, 48 to 52°C (115 to 125°F ).
and Applications
6.5 Rubber Stoppers, No. 8, 3.2 cm (1.25 in.) smaller
D 2793 Test Method for Block Resistance of Organic Coat-
3 diameter.
ings on Wood Panel Substrates
6.6 Weights, 1000 g.
D 3003 Test Method for Pressure Mottling and Blocking
3 6.7 Scissors.
Resistance of Organic Coatings on Metal Substrates
6.8 Aluminum Tray or Pan, flat.
3. Terminology
7. Procedure
3.1 Definition:
7.1 Castthepainttobetestedonasealedtestchartusingthe
3.1.1 blocking—The undesirable sticking together of two
applicator blade. Condition coated panels in the conditioned
painted surfaces when pressed together or placed in contact
room for seven days.All painted panels should be kept free of
with each other for an extended period of time, as referenced in
grease, oil, or fingerprints since these will affect block resis-
Terminology D 16.
tance.
4. Summary of Test Method 7.2 After the panels have been conditioned, cut out six 3.8
1 1
by 3.8-cm (1 ⁄2 by 1 ⁄2-in. ) sections from the painted chart.
4.1 Dried paint films are placed face-to-face and a pressure
Start the cut at least 1.3 cm ( ⁄2 in.) away from the edge of the
of about 127 g/cm (1.8 psi ) is applied. These paint films are
drawdown.
7.3 Place the cut sections with the paint surfaces face-to-
This test method is under the jurisdiction of ASTM Committee D01 on Paint
face for each paint to be tested.
and Related Coatings, Materials, andApplications and is the direct responsibility of
7.4 The weights, stoppers, and tray should be temperature
Subcommittee D01.42 on Architectural Coatings.
Current edition approved Oct. 1, 2003. Published
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