What is glass?
Glass is made using three different minerals:
1. Sand (silica) - intense heat changes sand into a fragile form of glass.
2. Soda ash (sodium carbonate) - this is a powdery white material that is added to the mixture to lower the melting temperature of the sand.
3. Limestone (calcium carbonate) - this is added to make the glass stronger.
The raw materials are melted together in a furnace at a temperature of 1600 degrees.
What is the difference between glass and crystal?
Lead Oxide is added to the glass mixture to create crystal. Crystal will give you that ping on a glass or the rainbows in a room. 24% Lead Crystal, with its exceptionally high perceived value, has been sought after and treasured for generations, and remains a status symbol even today.
Are there different types of crystal?
To be considered crystal, material has to have at least 7% lead oxide in the mix.
To be considered Full Lead Crystal it needs to contain a minimum of 24% lead oxide. The lead adds the brilliance and the weight to the glass body. Our Asfour crystal is full 30% lead crystal.
What is Optic Crystal?
Optic Crystal is 100% Lead Free and extremely hard. It is this hardness that provides the basis for the brilliant cuts and bevels, as well as the ultra high polished surfaces. This is a newer material that is sometimes used in place of Full Lead Crystal due to the fact that it is a much less expensive material to produce.