ASTM D5402, Practică standard pentru evaluarea rezistenței la solvenți a acoperirilor organice utilizând frecarea cu solvent, describes a solvent friction technique for evaluating the solvent resistance of organic coatings that undergo chemical changes during curing.
Semnificație și utilizare

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. in orice caz, 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.

Practică standard ASTM D5402-2019 pentru evaluarea rezistenței la solvenți a acoperirilor organice utilizând frecarea cu solvent

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.

Etapa 1: Domeniul de aplicare

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.

Practică standard ASTM D5402-2019 pentru evaluarea rezistenței la solvenți a acoperirilor organice utilizând frecarea cu solvent

1.3 Valorile exprimate în unități SI vor fi considerate standard. Valorile date în paranteze sunt doar pentru referință.

1.4 This standard is not intended to address all safety concerns associated with its use. Este responsabilitatea utilizatorilor acestui standard să stabilească siguranța corespunzătoare, 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 Acest standard internațional se bazează pe principiile de standardizare recunoscute la nivel internațional stabilite în Decizia privind principiile pentru elaborarea standardelor internaționale., Guidelines and Recommendations issued by the WTO Technical Barriers to Trade (TBT) Committee.