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Brilliant clarity

Spiegelau glasses are extremely transparent, clear and brilliant. But how can these benefits be achieved?

To start with, it depends to a great extent on the type of glass used and the characteristics of the ingredients.

Glass consists of sand, lime (an alkaline earth oxide), Sodium or Potassium oxides (Alkali oxide) and a certain amount of cullet of the same composition. These ingredients will be melted at approx. 1500°C and in later steps formed to the desired product.

Depending on the composition, there are four major categories of glass: Borosilicate, Glass, Crystal glass, and Lead crystal.

Four major categories of glass


Use: tempered glass, lab equipment


Use: window glass and cheap, simple drinking glasses

Crystal glass

Use: premium table ware and premium stemware and tumblers

Lead crystal

Use: high end tableware, gifts, premium stemware and tumblers

Spiegelau glasses are made of Crystal glass

The high quality of the Crystal ingredients make the Spiegelau products more durable, dishwasher safe, break resistant and also more brilliant than other glasses made with cheaper glass compositions.


  • Crystal glass contains at least 10% Metal oxides.
  • Elements like Potassium enhance light refraction and transparency and make the glass more brilliant.
  • Zinc stands for chemical durability and finally dishwasher safety
  • High quality sand lets glasses shine transparently and clear.
  • Pure sand that contains only very little iron avoids greenish or other colored effects in the glass.