1. Glass quality: pure and uniform, without defects such as sand, stripes, bubbles, etc. High transparency of colorless glass; Color glass has a uniform and stable color and can absorb light energy at a certain wavelength.
2. Physical and chemical properties: It has certain chemical stability and does not interact with the contents. It has a certain degree of seismic resistance and mechanical strength, and can withstand heating and cooling processes such as washing and sterilization, as well as filling, storage, and transportation. When encountering general internal and external stress, vibration, and impact, it can remain undamaged.
3. Molding quality: Maintain a certain capacity, weight, and shape, with uniform wall thickness, and a smooth and flat mouth to ensure convenient filling and good sealing. No distortion, surface roughness, unevenness, cracks, and other defects.