Význam a účel
4.1 Voda způsobuje degradaci povlaku, so understanding how the coating is waterproof helps to predict its service life. Condensation test failures can be caused by a variety of factors, including defects in the coating itself, contamination of the substrate, or inadequate surface treatment. Proto, the test can be used to evaluate individual coatings or complete coating systems.

4.2 Condensation tests of coatings are used for specification acceptance, quality control, and research and development of coating and substrate treatments. These tests typically lead to a determination of pass or failure, but can also measure the extent of failure. If there is no evidence of water-related failure after a specified time period, the coating system is considered to have passed.

4.3 Until the quantitative relevance of the coating or coating system is determined, the results obtained using condensation tests in accordance with this practice should not be expressed as equivalent to a period of exposure to water in the natural environment.

4.4 The test is usually performed on metal, plastic or wood specimens with the coating facing the interior of the chamber. nicméně, the foaming resistance of house coatings on wood specimens can be tested by mounting an uncoated wood surface facing the interior part of the chamber.

4.5 This practice can be used for corrosion testing, especially if the specimen is regularly dried. Although the corrosion products are discharged into the water bath, they are not carried into the steam condensing on the specimen.

ASTM D 4585-2018 “Stanovení voděodolnosti nátěrů řízenou kondenzací”

Pohled do
1.1 This practice covers the fundamentals and operating procedures for testing the water resistance of coatings using controlled condensation. Condensation was generated by exposing one surface of the coated specimen to a heated saturated air and water vapor mixture, while the opposite side of the specimen was exposed to the cooling effect of room temperature air. The practice stems from research by the Cleveland Paint Technology Association. Arabic numerals

1.2 This practice is limited to methods of obtaining, measuring and controlling conditions and procedures for controlled condensation tests. It does not specify sample preparation, specific test conditions, or evaluation of results.

Poznámka 1: Alternative methods for testing water resistance of coatings include practices D870, D1735 and D2247.

1.3 Values expressed in SI units or inch-pound units should be treated separately as standard values. The values specified in each system may not be exactly equivalent; Proto, každý systém by měl být používán nezávisle na sobě. Merging the values of the two systems may result in non-compliance with the criteria.

ASTM D 4585-2018 “Stanovení voděodolnosti nátěrů řízenou kondenzací”

1.4 Tato norma není určena k řešení všech bezpečnostních problémů, jestli nějaký, spojené s jeho užíváním. Je odpovědností uživatele této normy zajistit odpovídající bezpečnost, zdravotní a environmentální postupy a určit použitelnost regulačních omezení před použitím.

1.5 Tato mezinárodní norma byla vyvinuta v souladu s mezinárodně uznávanými normalizačními zásadami stanovenými v Rozhodnutí o zásadách pro vývoj mezinárodních norem., Směrnice a doporučení vydané Výborem pro technické překážky obchodu Světové obchodní organizace.