Standards of metal enclosure products: technics processing, surface treatment.
A side: refers to the front side, upper surface after assembly into the whole machine.
B surface: the side after being assembled into the whole machine.
C surface: refers to the back and bottom surfaces assembled into the whole machine.
E (DELTA-E) in the uniform color perception space, the test unit of human eye color difference.
Edge: Metal burrs on the edge or parting surface of the workpiece due to improper treatment after mechanical stamping or cutting.