Lead vs. Optical Crystal

Lead Crystal or Lead Glass, commonly called "crystal", is a variety of glass in which lead replaces the calcium content of a typical potash glass. Lead glass contains typically 18–40 weight% lead(II) oxide (PbO), while modern lead crystal, historically also known as flint glass due to the original silica source, contains a minimum of 24% PbO. Lead glass is desirable owing to its decorative properties.

Originally discovered by Englishman George Ravenscroft in 1674, the technique of adding lead oxide (in quantities of between 10 and 30%) improved the appearance of the glass and made it easier to melt using sea-coal as a furnace fuel. This technique also increased "working period" making the glass easier to manipulate.

Lead crystal glassware was formerly used to store and serve drinks, but due to the potential health risks of lead, this is rare nowadays.

Optical Crystal: Optical crystal is manufactured in large sheets then pressed under enormous pressure to ensure it has no bubbles or distortions. Unlike Lead Crystal, Optical crystal is lead free which is perfect for all kinds of engraving methods though we choose to sand blast, which provides the highest quality etch on the market. Each piece is hand polished and beveled to perfection to ensure the ultimate in corporate recognition products. Optical crystal are mostly commonly used in laser engraved crystal awards and crystal gifts industry.

* Source https://en.wikipedia.org