The requirements of fingerprint resistance for household appliances are high, and the following properties should be tested:
(1) Corrosion resistance
The corrosion resistance of fingerprint plate should not only be tested directly, but also be tested after alkaline degreasing and 6 mm extrusion processing with cupping tester. Generally, the oxidation area of untreated
fingerprint plate should be less than 5% in 96 h salt spray test, and 72 h and 64 h after degreasing and extrusion.
In order to ensure that the electronic and electrical enclosures have good static resistance, 3C manufacturers
generally require that the surface resistance of fingerprint resistant products should be less than a certain range.
(3) Hygrothermal resistance
The hygrothermal resistance test is a laboratory simulation experiment designed to examine whether the product can keep its surface from blackening and white rust after being transported and stored at relatively
severe high temperature and humidity. The method is to apply constant pressure after overlapping the test samples, place them at 50 ℃ and 98% humidity, and check the change of color difference after 120 hours.
(4) High temperature resistance
Some users repeatedly enter the coating curing furnace due to the need of rework during the manufacturing process of the products. They hope that the surface of fingerprint resistant products will not turn yellow after several times of high-temperature
baking. The method is to bake the sample at 240 ℃ for 20 minutes, then cool it naturally and cycle it for 4 times, and then check the change of color difference.
(5) Fingerprint resistance
The method is to apply a small amount of Vaseline
on the surface of the sample, spread it evenly with absorbent cotton, and wipe off the excess part, and then check the change of color difference.
The technical requirements for the performance of chromium free fingerprint resistant board are shown
in the table below.