How to choose a glass

1. Whiteness: no obvious color is required for the exposed glass.

2. Bubbles: A certain number of bubbles of a certain width and length are allowed, while bubbles that can be punctured by a steel needle are not allowed.

3. Transparent pimple: refers to the glass body with uneven melting. For glass cups with a volume of less than 142mL, there shall be no more than one glass cup with a length of no more than 1.0mm; For glasses with a capacity of 142~284mL, there shall be no more than one glass with a length of no more than 1.5mm, and 1/3 of the transparency of the glass body shall not be allowed.

4. Miscellaneous particles: refers to opaque granular impurities, with a length of no more than 0.5mm and no more than one.

5. Cup mouth roundness: refers to that the cup mouth is not round, and the difference between the maximum diameter and the minimum diameter is not more than 0.7~1.0mm. 6. Streaks: visible from 300mm are not allowed.

7. Low deviation of cup height (low deviation of cup height): the height difference between the highest and lowest parts of a cup body is not more than 1.0~1.5mm.

8. Thickness difference of cup mouth: no more than 0.5~0.8mm

9. Shear marks: refer to stripes or centipede like shear marks, no more than 20~25mm in length and 2.0mm in width, no more than one, which exceed the bottom of the cup or are white and shiny, and no more than 3mm is allowed.

10. Mold print: The cup body is a hidden print of record grain, and it is not allowed to have obvious head up.

11. Shrinkage of the cup body: It refers to the uneven cup body, and it is not allowed to have the obvious flat view.

12. Rubbing and scratching: Rubbing refers to the friction between the glass and the diameter of the glass, leaving a tarnish mark on the glass body, which is not allowed if it is obvious. Scratch refers to the bruise left on the surface of the glass body due to collision between glasses. The shiny one is not allowed.

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