Crown glass is a type of optical glass. It is made without lead or iron and is used in the manufacture of lenses and other tools and equipment concerned with the visible part of the electromagnetic spectrum.
- Crown glass is produced from alkali-lime silicates containing approximately 10% potassium oxide.
- Crown glass is favoured for its optical qualities including its relatively low refractive index and low dispersion.
- As well as the specific material called crown glass, there are other optical glasses with similar properties that are often referred to by the same name.
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