How to measure moisture and heat resistance?

The moisture and heat resistance determination method of the paint film is as follows:

(1) Prepare the paint film model first, and prepare according to the relevant requirements of "Paint Film Preparation Method". Make the surface of the paint film smooth and smooth, without pitting, pinholes and other defects, and minimize fingerprints, etc.

(2) Test equipment: use temperature and humidity control box.

(3) Test conditions:

Test temperature: 47±1℃

Relative humidity: 95%~1oo%

Test cycle: Every 24 hours is a cycle, and it is checked once, and the test is continued until the sample is damaged.

Test water: distilled or deionized water.

Hanging position of the sample: the sample is hung vertically, the samples are not in contact with each other, and the positions should be exchanged during the inspection.

During the test, special attention should be paid to the control of temperature and humidity, the most important influencing factors.