1. Glass quality: pure and uniform, without gravel, streaks, bubbles and other shortcomings. High transparency of colorless glass; color glass color uniformity and stability, can absorb a certain wavelength of light energy.
2. Physical and chemical properties: a certain degree of chemical stability, not with the role of the contents. With a certain degree of shock resistance and mechanical strength, can withstand washing, sterilization and other heating, cooling process and withstand filling, storage and transportation, encountering general internal and external stress, vibration, impact, can remain undamaged.
3. Molding quality: maintain a certain capacity, weight and shape, wall thickness uniformity, smooth, flat mouth to ensure that the filling convenience and good sealing. No distortion and deformation, the surface is not smooth, uneven and cracks and other shortcomings.