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Significance and Use
5.1 Silica sand produces a slower rate of abrasion for organic coatings than that provided by silicon carbide. For some types of coatings, it may also provide greater differentiation.
5.2 The abrasion resistance scales produced by the two methods differ, but the methods provide approximately the same rankings of coatings for abrasion resistance.
5.3 Each of the methods has been found useful for rating the abrasion resistance of specific types of coatings. For example Method A (falling sand) has been used for rating floor coatings while Method B (falling silicon carbide) has been used for rating coatings for ship decks.
Note 1: All dimensions are given in inches. 1 in. = 25.4 mm.
1.1 These test methods cover the determination of the resistance of organic coatings to abrasion produced by abrasive falling onto coatings applied to a plane rigid surface, such as a metal or glass panel.
1.2 Two test methods based on different abrasives are covered as follows:
Method A—Falling Sand Abrasion Test
Method B—Falling Silicon Carbide Abrasion Test
1.3 These methods should be restricted to testing in only one laboratory when numerical values are used because of the poor reproducibility of the methods (see and ). Interlaboratory agreement is improved significantly when ranking is used in place of numerical values.
1.4 The values stated in SI units are to be regarded as the standard with the exception of mils when determining coating thickness. The values given in parentheses are for information only.
1.5 This standard does not purport to address 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.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
D823 Practices for Producing Films of Uniform Thickness of Paint, Varnish, and Related Products on Test Panels
D1005 Test Method for Measurement of Dry-Film Thickness of Organic Coatings Using Micrometers
D7091 Practice for Nondestructive Measurement of Dry Film Thickness of Nonmagnetic Coatings Applied to Ferrous Metals and Nonmagnetic, Nonconductive Coatings Applied to Non-Ferrous Metals
E11 Specification for Woven Wire Test Sieve Cloth and Test Sieves
Other StandardsANSI B74.12 Specifications for the Size of Abrasive Grain -- Grinding Wheels, Polishing and General Industrial Uses Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036, http://www.ansi.org. FEPA Standard 42-2:2006 Grains of Fused Aluminum Oxide, Silicon Carbide and other Abrasive Materials for Bonded Abrasives and for General Applications -- Microgrits F230 to F2000 Available from Federation of European Producers of Abrasives (FEPA), 20, av. Reille, Paris, F-75014, www.fepa-abrasives.org.
ICS Number Code 25.220.60 (Organic coatings)
UNSPSC Code 31211504(Coating paints)
|Link to Active (This link will always route to the current Active version of the standard.)|
ASTM D968-16, Standard Test Methods for Abrasion Resistance of Organic Coatings by Falling Abrasive, ASTM International, West Conshohocken, PA, 2016, www.astm.orgBack to Top