aluminium composite sign board Aluminium sheet thickness
Peel off the aluminium sheets from the specimens aluminium composite sign board properly. Use the measuring gauge with minimum hatching of 0.01 mm to measure the thickness (excluding the thickness of coating etc.). The meas-urement shall be made on at least five positions. including four corners and the geometrical center.Take a minimum and the mean value of all measurements as the test result.
aluminium composite sign board Appearance
Under the natural light condition without direct sunshine. the aluminium composite sign board are set side by side with the ori-entation same as production and the included angle between the panel and the horizontal surface is70° 10°. The visual inspection shall be conducted 3 m away from the panels. Use the straight rulerwith minimum hatching of 1 mm to measure the maximum size of the defects found. The inspectorsshall not be those who have sampled or set the panels.
If there is any disagreement on color difference. the arbitration test shall be then conducted accordingto GB/T 11942. The production direction of the panels shall be kept consistent in the test.
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