| Test Item | Coating | ||
| PVDF | PE | ||
| Double layers | Three layers | ||
| Coating thickness | ≥ 25 | ≥ 30 | ≥ 18 |
|
Gloss Tolerance |
While 60 ° gloss value ≥ 80 unit, tolerance ± 10 unit | ||
| While 60 ° gloss value ≥ 20 - 80 unit, tolerance ± 7 unit | |||
| While 60 ° gloss value < 20 unit, tolerance ± 5 unit | |||
| Pencil Hardness | ≥ 1H | ≥ 2H | |
| Flexibility of coating | While ≤ 2T, coating no crack or peel off | ||
| Adhesive property | 0 or 1 grade | ||
| Impact Resistance | coating no crack or peel off | ||
| Acid Resistance | Surface immersed with 5% HCL (V/V) for 48 H without change | Surface immersed with 2% HCL (V/V)for 48 H w | |
| Solvent Resistance | Brushing 200 times with butanone no appearance to bottom | Brushing 100 times with butanone no appearance to bottom | |
| Chromatism | The coating color is almost the same as confirmed by buyer and seller, the color difference tested by colorimeter between coating sample is less than 1. | ||
| Saly Fog Resistance | Outside 3mm the line which is scrached, no corrosion and coating peel off | ||
| Moisture Resistance | Coating change is less than 1 grade after 1000 hrs humidity test | ||
| Weather Resistance | After 2000 hrs xenon lamp shining test, no powder come into being, glossy retention rate ≥ 85%, color change degree at least reaching to 1 grade. | ||
| Note: The test is as per China National Standard and Nonferrous Metals Industry Standard for color coated aluminum coil and ACP | |||
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