[China Aluminum Network] If the same type of aluminum material has different color on the sand surface, it may be related to the following factors:
(1) The thickness of sand. But this is generally easier to identify.
(2) Sand shape.
(3) Sand varieties. The color of the new sand or silicon carbide that was used initially was dark gray; the color of the old sand or quartz sand that had been used for a long time was light grey.
(1) The thickness of sand. But this is generally easier to identify.
(2) Sand shape.
(3) Sand varieties. The color of the new sand or silicon carbide that was used initially was dark gray; the color of the old sand or quartz sand that had been used for a long time was light grey.