Meaning and Purpose
5.1 Many architectural coatings, especially white and light colors, exhibit significant changes in film opacity when drying. The increase in hiding power is sometimes associated with the porosity and poor film integrity of traditional formulated coatings. Reductions can lead to disappointing paint jobs. Thus, the change in covering power from wet to dry is a property of great practical importance.

5.2 This test method can be used for paint specifications and as a short procedure for evaluation and quality control.

ASTM D5007-99-2017 Standard Test Method for Changes in Wet to Dry Hiding Power

Scope of
1.1 This test method involves determining the change in the hiding power of architectural coatings during drying by visually evaluating wet and dry films.

1.2 This test method is not recommended for colors other than white and light colors.

1.3 Values expressed in SI units shall prevail. The values given in parentheses are for reference only.

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

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