Indispensable testing items for mobile phone surface coating:
1. Adhesion, common mesh or cross type. Note that ASTM and national standard ratings are just the opposite. Generally ASTM 3B or above, national standard 1 or above
2, hardness test (pencil hardness tester): ASTM uses Mitsubishi pencil, the national standard for China, this according to different manufacturers, substrates, paint categories, site requirements vary from 6B to 9H (on the screen).
3, Taber friction test (Taber wear test machine) : load 500g, friction wheel model CS-10, CS-17 three evaluation methods: quality loss, wear level, whether the bottom is exposed, how many circles are currently based on the standard More. For example, N manufacturers coating surface 3500, button 8000, laser spraying 1000.
4, RCA paper belt friction test (paper belt friction test machine) : refer to the standard ASTMF2357-2004, optional parameters, paper strip width, load, number of revolutions, the current 175g load is more, the difference is relatively large, 50,250, 300 have.
5, friction decolorization
6. Low temperature test (high and low temperature test chamber: according to IEC60068-2-1 typical experimental conditions minus 40, 20, 15 time 24 hours or multiple times after evaluation of appearance, adhesion, hardness
7. High temperature test (high temperature aging test chamber) IEC60068-2-2 temperature 85, 70, 55 time is the same as above, the evaluation is the same as above.
8, temperature change test (high and low temperature alternating test chamber): IEC60068-2-14, low temperature 2 hours, high temperature 2 hours, the temperature change rate is sometimes required. There is also a constant damp heat test (40 degrees, 93% RH), alternating wet heat condition test
9. Xenon lamp aging test (Xenon lamp aging test chamber) : Simulated solar radiation. For example, M manufacturers require conditions, 730W/m2, color after 21 days, gloss, RCA, hardness
10. Fluorescent UV aging test (UV-UV aging test chamber) : UVA-340 simulates outdoor natural aging, UVA-351 simulates solar aging through window glass, UVB-313 automotive weathering material. Example N manufacturers' experimental conditions: 12 cycles, 8 hours per cycle.
11. Halogen lamp aging test (halogen lamp aging tester) : The spectral distribution is similar to the surface of the earth, especially in the infrared region. S manufacturer standard refers to IEC68-2-5 B
12, salt spray test (salt fog corrosion test chamber) : NSS neutral salt spray temperature 33-37, NaCl solution 45-55g / l, with hydrochloric acid or sodium hydroxide to adjust PH 6.5-7.2
AASS acetate mist is the same as above, adjusting pH 3.1-3.3 with glacial acetic acid or sodium hydroxide
CASS copper accelerated acetate mist temperature 48-52 Same as above, 0.2g / L CuCL2.2H2O solution was added.
Also : alcohol resistant, resistant to artificial sweat, chemical resistant, chemical resistant.
Button fatigue test, drop test machine, coating the antibacterial test.
These are the current common mobile phone coating test projects.
Hydrolyzed Sponge White Powder
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Chengdu Sino Tech company , https://www.cnherbfun.cn