Significance and Use
5.1 Tannins and other chromophoric extractives are naturally occurring materials in wood and wood-based substrates. Tannins are prevalent to a high degree in cedar, redwood, oak and to a lesser degree in white and yellow pine. Tannins are also present in varying amounts in wood composition products. These extractives are solubilized and darkened in color by aqueous coatings, resulting in unsightly yellow or brown discolorations. This test method is designed to show the relative ability of paints to prevent tannin bleed-through. Typically cedar or redwood panels are used for this test.
1.1 This test method is an accelerated procedure to determine the effectiveness of latex coatings at preventing the migration of tannin stains from wood substrates.
1.2 The values in SI units are to be regarded as the standard. The values in parenthesis 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.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
D1475 Test Method For Density of Liquid Coatings, Inks, and Related Products
D4585 Practice for Testing Water Resistance of Coatings Using Controlled Condensation
D5068 Practice for Preparation of Paint Brushes for Evaluation
stain blocking; tannin stain; wood extractives; wood stain;
ICS Number Code 19.040 (Environmental testing); 25.220.01 (Surface treatment and coating in general)
ASTM International is a member of CrossRef.
Citing ASTM Standards
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