Glass quality: pure and uniform, no sand, stripes, bubbles and other defects. The colorless glass has high transparency, and the color glass is uniform and stable, which can absorb the light energy of a certain wavelength.
Physical and chemical properties: have certain chemical stability, do not act with the contents. It can withstand washing, sterilization and other heating, cooling, filling, storage and transportation, general internal and external stress, vibration, impact, can remain undamaged.
Molding quality: maintain a certain capacity, weight and shape, uniform wall thickness, smooth mouth, smooth to ensure filling convenience and good sealing. No distortion, surface is not smooth, uneven and crack defects.