ASTM D 6686-2019 “Evaluation of Tannin Coloring Resistance of Coatings”

Meaning and Purpose
5.1 Tannins and other hair color extracts are naturally occurring materials in wood and woody substrates. Tannin was found to be high in cedar, redwood, oak, and low in white and ponderosa pine. Tannins are also present in different amounts in wood component products. These extracts are dissolved by water-based paints and darkened, resulting in unsightly yellow or brown discoloration. This test method is designed to show the relative ability of the paint to prevent tannin leakage. Typically, cedar or rosewood panels are used for this test.

ASTM D 6686-2019 “Evaluation of Tannin Coloring Resistance of Coatings”

Scope of
1.1 This test method is an accelerated procedure used to determine the effectiveness of latex coatings in preventing tannin stains from migrating from wood substrates.

1.2 Values in SI units shall be considered standard. Values in parentheses are for reference only.

1.3 This standard is not intended to address all safety issues, 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 to determine the applicability of regulatory restrictions prior to use.

1.4 This international Standard has been developed in accordance with the internationally recognized standardization principles established in the Decision on Principles for the Development of International Standards, Guidelines and Recommendations issued by the Committee on Technical Barriers to Trade of the World Trade Organization.

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