ASTM D5795-16
Standard Test Method for Determination of Liquid Water Absorption of Coated Wood and Wood Based Products Via &x201c;Cobb Ring&x201d; Apparatus

Standard No.

ASTM D5795-16

Release Date

2016

Published By

American Society for Testing and Materials (ASTM)

Status

Be replaced

Replace By

ASTM D5795-16(2024)

Latest

ASTM D5795-16(2024)

Scope

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 to 25 mm (¹/₄ 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.

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 and health practices and determine the applicability of regulatory limitations prior to use.

ASTM D5795-16 Referenced Document

• ASTM D1193 Standard Specification for Reagent Water
• ASTM D16 Standard Terminology for Paint, Related Coatings, Materials, and Applications
• ASTM D5235 Standard Test Method for Microscopical Measurement of Dry Film Thickness of Coatings on Wood Products
• ASTM D6132 Standard Test Method for Nondestructive Measurement of Dry Film Thickness of Applied Organic Coatings Over Concrete Using an Ultrasonic Gage
• ASTM D9 Standard Terminology Relating to Wood
• ASTM E177 Standard Practice for Use of the Terms Precision and Bias in ASTM Test Methods
• ASTM E691 Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method

ASTM D5795-16 history

• 2024 ASTM D5795-16(2024) Standard Test Method for Determination of Liquid Water Absorption of Coated Wood and Wood Based Products Via “Cobb Ring” Apparatus
• 2016 ASTM D5795-16 Standard Test Method for Determination of Liquid Water Absorption of Coated Wood and Wood Based Products Via &x201c;Cobb Ring&x201d; Apparatus
• 1995 ASTM D5795-95(2008) Standard Test Method for Determination of Liquid Water Absorption of Coated Hardboard and Other Composite Wood Products Via
  x201C;Cobb Ringx201D; Apparatus
• 1995 ASTM D5795-95(2000) Standard Test Method for Determination of Liquid Water Absorption of Coated Hardboard and Other Composite Wood Products Via "Cobb Ring" Apparatus