Standard for Ceramic Mug's Quality

OEM ceramic mug, you need to know whether the requirements are reached, then you need to determine whether the ceramic mug meet the standard classification.

The first grade: A grade product, the surface without obvious defects, no deformation, no cave, no drop miscellaneous, white porcelain requirements no spots, color glaze requirements uniform flow glaze. No glazed heap.
The second grade: B grade product, the surface without obvious defects, deformation + -0.1CM, no cave, can make a pinhole, no drop miscellaneous, white porcelain requirements 0.1CM above spots, color glaze requirements uniform color No flow glaze. Glaze pile is not obvious.
The third grade product: C grade product, the surface has no obvious flaw, the deformation quantity + -0.2CM, does not have the cave, may make three pinholes, but not on the same side, does not fall the miscellaneous, the white porcelain requests no 0.1 CM above spot, Color glaze requirements uniform flow without glaze. Glaze pile is not obvious.
Four products: D grade, the surface of a cave, deformation: + - 0.3CM, 3 pinhole above, but not a film exists. A drop-off, but not stabbing, white porcelain requirements of more than 0.2 CM spots, color glaze requirements uniform color.

Other, usually inventory mug for the four to five, please note that the purchase of grade requirements.