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ASTM D4946-89(2025)

Standard Test Method for Blocking Resistance of Architectural Paints
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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 D3003, which is concerned with blocking of industrial coatings on metal substrates, nor with Test Method D2793 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

5.1 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.

SDO ASTM: ASTM International
Document Number D4946
Publication Date Aug. 1, 2025
Language en - English
Page Count 2
Revision Level 89(2025)
Supercedes
Committee D01.42
Publish Date Document Id Type View
Aug. 1, 2025 D4946-89R25 Revision
Feb. 1, 2017 D4946-89R17 Revision
July 1, 2012 D4946-89R12 Revision
Feb. 1, 2008 D4946-89R08E01 Revision
Oct. 1, 2003 D4946-89R03 Revision
June 10, 1999 D4946-89R99 Revision