Active Standard ASTM D4946 | Developed by Subcommittee: D01.42
Book of Standards Volume: 06.02
Historical (view previous versions of standard)
Significance and Use
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.
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.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
D16 Terminology for Paint, Related Coatings, Materials, and Applications
D2793 Test Method for Block Resistance of Organic Coatings on Wood Panel Substrates
D3003 Test Method for Pressure Mottling and Blocking Resistance of Organic Coatings on Metal Substrates
ICS Number Code 87.040 (Paints and varnishes)