- Opal glass refers to glass that has been added or naf caf2 to achieve crystallization in glass. The glass is opaque, transparent, resistant, acid - base and moderate strength.
-Glass opal glass refers to NaF or CaF2 is filled to achieve crystallization in glass, glass is the transparent turbidity. Is resistant to acid-base and moderate strength.
- a glass, a glass of hot spots, means that there is a filling CaF NaF or 2 for the crystallization of glass, transparent glass, with the discontent with the acid-resistant - bass and mid-strength