How to determine the wet heat resistance of the film? Welded Gabions,Welded Gabion Mesh,Welded Gabion Wall,Welded Wire Gabion ANPING HONGYU WIREMESH CO.,LTD , https://www.hongyu-wiremesh.com
The moisture and heat resistance of the coating film can be measured according to the method in the national standard GB/T174o-89 color wheel, paint film moisture resistance test method. This standard is applicable to the determination of the wet heat resistance of paint films. The temperature and humidity control box is used to control a certain temperature, humidity and time to test, and the grade is evaluated according to the degree of appearance damage of the sample.
(1) Materials and equipment
Temperature control and humidity box
Transparent plexiglass plate 70mm>
Distilled water
(2) Measuring method
According to the product standard, the bottom bar coating equipment and the supporting substrate are selected, and the paint film preparation method (GB/T1765) for measuring humidity resistance, salt spray resistance and weather resistance (human 1: acceleration) is determined.
Record the original state of the template before testing. Then, the template is vertically suspended on the sample rack, and the front side of the template is not in contact with each other. It was placed in a temperature-controlled humidity-conditioning box which was previously adjusted to a temperature of 47 ° C ± 1 ° C and a relative humidity of 96% soil 2%. When the tank is raised back to the specified temperature and humidity, the same calculation is started. Condensed electronic balances should not appear on the surface of the sample during the test. The test was carried out 48 hours in a continuous test. After two inspections, check every 72 hours. The template should change position after each inspection. The last inspection is carried out according to the number of times specified by the product standard; if there is no product standard, the inspection time can be determined according to the specific conditions.
(3) When the sample inspection and rating inspection, the surface of the sample plate must be selected to be free of fingerprints. When the light is sufficient or the light is directly irradiated, the results are compared with the standard. The result is based on two plates with the same level roughness meter in the three plates. The heat and humidity resistance of the paint film was evaluated according to Table 6-4.
For product information of high and low temperature test chambers, please refer to: http://
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