Surface quality of алюмінієва проступь
(1) Ordinary accuracy: the surface of the aluminum plate is allowed to have a thin layer of iron oxide scale, and the surface roughness and height or depth of the surface formed by the iron oxide scale falling off exceed the allowable deviation and other local defects. Insignificant burrs and individual marks whose height does not exceed the height of the pattern are allowed on the pattern. The maximum area of a single defect does not exceed the square of the grain length.
(2) Higher accuracy: The surface of the aluminum plate is allowed to have a thin layer of iron oxide scale and other local defects whose height or depth does not exceed half of the thickness tolerance.