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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.
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
ICS Number Code 19.040 (Environmental testing); 25.220.01 (Surface treatment and coating in general)
UNSPSC Code 46181533(Protective coats)