ASTM D5402, Standard Practice for Evaluating the Solvent Resistance of Organic Coatings Using Solvent Friction, describes a solvent friction technique for evaluating the solvent resistance of organic coatings that undergo chemical changes during curing.
Meaning and use

4.1 Coatings that undergo chemical changes during curing, such as epoxies, vinyl esters, polyesters, alkyd resins and carbamates, become more resistant to solvents when curing. These coatings should reach a specific level of solvent resistance before being applied and put into use; The level of solvent resistance required varies with the type of paint and the intended use. Rubbing with a cloth impregnated with the appropriate solvent is one way to determine when a particular level of solvent resistance has been reached. However, its own level of solvent resistance does not indicate complete cure, and some coatings are already solvent resistant before they are cured sufficiently for service.

ASTM D5402-2019 Standard Practice for Evaluating Solvent Resistance of Organic Coatings Using Solvent Friction

4.2 The time required to achieve specific solvent resistance may be affected by temperature, film thickness, air flow, and humidity for water-based or water-reactive coatings.

4.3 The effect of the test solvent on the coating varies with the type of coating and the solvent used. The paint manufacturer can specify the solvent, the number of two wipes, and the specific test results required.

Step 1: Scope

1.1 This practice describes a solvent friction technique for evaluating the solvent resistance of organic coatings that undergo chemical changes during curing. The technology can be used in the laboratory, in the field or on the manufacturing floor. Test method D4752 is an optional method for ethyl silicate zinc-rich primer.

1.2 This convention does not specify the solvent, the number of wipes or the expected test results.

ASTM D5402-2019 Standard Practice for Evaluating Solvent Resistance of Organic Coatings Using Solvent Friction

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

1.4 This standard is not intended to address all safety concerns associated with its use. It is the responsibility of users of this standard to establish appropriate safety, health and environmental specifications and to determine the applicability of regulatory restrictions prior to use. Consult the supplier’s Safety Data Sheet for hazard specific information about the solvents used.

1.5 This international standard is based on internationally recognized standardization principles established in the Decision on Principles for the Development of International Standards, Guidelines and Recommendations issued by the WTO Technical Barriers to Trade (TBT) Committee.