Crystal cup is also a kind of glass, and its main component is silicon dioxide, but lead, barium, zinc, titanium and other substances are introduced. This kind of glass is called crystal glass because of its high transparency and refractive index and smooth appearance. If lead is introduced, it is a lead crystal. Barium, zinc and titanium are introduced into lead-free crystals.

2. Double glazing

The raw materials of double-layer glass are high borosilicate glass and food-grade dining glass, which are fired at more than 600 degrees. Usually, it is made of high borosilicate glass tubes baked by technicians under a sealing machine, and large and small internal and external tubes. It is a new type of environmental protection teacup, which is favored by people more and more.

3, ordinary glass office cup

Refers to a cup made of glass, usually made of high borosilicate glass and fired at a high temperature of more than 600 degrees. It is a new type of environmental protection teacup, which is favored by people more and more.

Selection method of extended information glass

1, whiteness: the exposed glass should have no obvious color.

2. Bubbles: bubbles with a certain number, width and length are allowed, but bubbles that can be punctured by steel needles are not allowed.

3. Transparent pimple: refers to glass with uneven melting. Glass with capacity less than 1.42 L, and no more than one glass with length less than 1.0mm; Glass with a capacity of 142~284mL, and no more than one glass with a length of 1.5mm, and no transparent protrusions are allowed on the glass body of 1/3.

References:

Baidu encyclopedia-glass