Kahulugan at Layunin
4.1 Ang tubig ay nagiging sanhi ng patong upang ibaba, 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. Kaya nga, 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. Gayunpaman, 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 “Determination of Water Resistance of Coatings by Controlled Condensation”

Saklaw ng
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.

Tala 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. Ang mga halaga na tinukoy sa bawat sistema ay maaaring hindi eksaktong katumbas; Kaya nga, bawat sistema ay dapat gamitin nang malaya sa isa't isa. Merging the values of the two systems may result in non-compliance with the criteria.

ASTM D 4585-2018 “Determination of Water Resistance of Coatings by Controlled Condensation”

1.4 Ang pamantayang ito ay hindi nilayon upang matugunan ang lahat ng mga isyu sa kaligtasan, kung meron man, na nauugnay sa paggamit nito. Responsibilidad ng gumagamit ng pamantayang ito na magtatag ng angkop na kaligtasan, mga kasanayan sa kalusugan at kapaligiran at upang matukoy ang pagiging angkop ng mga paghihigpit sa regulasyon bago gamitin.

1.5 Ang internasyonal na Pamantayang ito ay binuo alinsunod sa mga internasyonal na kinikilalang prinsipyo ng standardisasyon na itinatag sa Desisyon sa mga Prinsipyo para sa Pag unlad ng Internasyonal na Pamantayan, Mga Patnubay at Rekomendasyon na inilabas ng Komite sa mga Teknikal na Hadlang sa Kalakalan ng World Trade Organization.