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ASTM D5795-16(2024)

Current Reaffirmation

Standard Test Method for Determination of Liquid Water Absorption of Coated Wood and Wood Based Products Via “Cobb Ring” Apparatus

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1.1 This test method is intended to serve as a means for measurement of liquid water that passes through a wetted paint film, and which is subsequently absorbed and retained by the underlying wood or wood-based substrate. Alternative techniques for the use of the “Cobb Ring” apparatus are described.

1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.


5.1 This test method provides a simple quantitative measure of water absorption by coated wood or wood based products.

5.2 This test method has demonstrated utility for wood or wood based products ranging in thickness from approximately 6 mm to 25 mm (1/4 in. to 1 in.).

5.3 Conditioning of substrate, coated sample preparation, application method, dry film thickness, cure conditions, and number of replicate specimens should be agreed upon between the purchaser and the supplier of the coating material.

5.4 Such measurements are used as indicators or predictors of the anticipated performance of coated wood or wood based products during exterior exposure. They may be used for developmental evaluation of coatings, substrates, or both. They may also be useful for quality control or monitoring of the production of coated wood and wood based products.

SDO ASTM: ASTM International
Document Number D5795
Publication Date Feb. 1, 2024
Language en - English
Page Count 4
Revision Level 16(2024)
Supercedes
Committee D01.52
Publish Date Document Id Type View
July 15, 2016 D5795-16 Revision
May 10, 2000 D5795-95R00 Revision
Feb. 1, 2024 D5795-16R24 Reaffirmation
June 1, 2008 D5795-95R08 Reaffirmation