Thickness

The manufacture make optical glass usually in a very big size more than 500mm*600mm. The secondary processor will re-size original glass into desired size. However, thickness is base on the original production status and usually will not process again. (Because processing thickness is very expensive and high risk). The product designer usually have to choice the exist thickness of glass in the market.

Property:

Each kind of optical glass have its own composition material. And this make the difference in physical and chemical properties. Some can stand acid-environment, some can stand for alkaline. Some can stand for hot. It have to be carefully selected by working environment of the applied product.

Surface Quality:

Surface quality is part of the property but will be consider as a special issue. Although the surface quality usually will not influence the optical spectrum function. But it is possible to be considered as a major acceptance criteria. Some glass easy to be scratched. Some may have lots of small digs. Some may easily generate mist on surface. If you did not care surface quality, you could choice cheap glass. If you care, the good surface quality glass usually much expensive than the bad one.
The process method to change surface quality is only by polishing. Use some grinding material to contact and polish the surface of glass. By this way, can remove top part surface of glass. But this work is very expensive. And will not suggest to use.

Glass Type and Manufacturer Information:

Thickness Table

Note: Borofloat is with 1.2,1.35, 1.5, 1.65, 1.85, 2.0, 2.5, 3.0, 3.5 ~ 17.0 mm