Technical standard for aluminum veneerRefer to GB / t23443-2009 (aluminum veneer for building decoration)
1、 Dimension deviation of length and width:
① Under 2000mm, the allowable deviation is ± 1.0mm
② More than 2000mm, the allowable deviation is ± 1.5mm
2、 Diagonal deviation;
① Within 2000mm, the allowable deviation of diagonal angle is ± 2.0mm
② Over 2000mm, the diagonal tolerance is ± 3.0mm
3、 Flatness of plate surface;
4、 Paint coating standard;
① Coating thickness: the second coating is more than 30um, the third coating is more than 40um, and the fourth coating is more than 55um
② Color deviation: there is no obvious color difference in visual inspection, or the color difference of computer color difference meter for monochromatic coating △ e ≤ 2nbs
③ Gloss: ± 5 error of limit value.
④ Mohs hardness: pencil hardness ± 1H.
⑤ Dry attachment: grid drawing method, 100 / 100, grade 0.
⑥ Impact resistance: front impact, 50kg f.cm (490N. Cm), no crack, no paint peeling.
5、 Chemical resistance;
① Hydrochloric acid resistance: 15 minutes drip, no bubble.
② Nitric acid resistance: color change △ e ≤ 4nbs
③ Mortar resistance: 24 hours without any change.
④ Anti detergent: no bubble and falling off after 72 hours.
6、 Corrosion resistance;
① Moisture resistance: 4000 hours, up to grade II of gb1740.
② Salt spray resistance: 4000 hours, reaching the second level of gb1740.
7、 Weather resistance;
① Fading: after 10 years, △ e ≤ 5nbs
② Pulverization: after 10 years, it will reach grade II of GB 1766
③ Gloss retention: after 10 years, the gloss will be maintained at or above% 50
④ Coating loss: after 10 years, the paint loss rate is less than or equal to% 10