ASTM D5402, Standard Practice para sa Pagsusuri ng Solvent Resistance ng Organic Coatings Gamit ang Solvent Friction, describes a solvent friction technique for evaluating the solvent resistance of organic coatings that undergo chemical changes during curing.
Kahulugan at paggamit

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. Gayunpaman, 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 para sa Pagsusuri ng Solvent Resistance ng Organic Coatings Gamit ang 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.

Hakbang 1: Saklaw

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 para sa Pagsusuri ng Solvent Resistance ng Organic Coatings Gamit ang Solvent Friction

1.3 Values expressed in SI units shall be considered standard. Ang mga halaga na ibinigay sa mga panaklong ay para sa sanggunian lamang.

1.4 This standard is not intended to address all safety concerns associated with its use. Responsibilidad ng mga gumagamit ng pamantayang ito na magtatag ng angkop na kaligtasan, kalusugan at kapaligiran pagtutukoy at upang matukoy ang pagiging angkop ng mga paghihigpit sa regulasyon bago gamitin. Consult the supplier’s Safety Data Sheet for hazard specific information about the solvents used.

1.5 Ang internasyonal na pamantayang ito ay batay sa mga prinsipyo ng standardisasyon na kinikilala ng internasyonal na itinatag sa Desisyon sa mga Prinsipyo para sa Pag unlad ng mga Internasyonal na Pamantayan, Mga Patnubay at Rekomendasyon na inisyu ng WTO Technical Barriers sa Trade (TBT) Komite.