John Moncrieff – Sapphire Glass Supplier

Experience the unparalleled hardness, transparency, and thermal stability of sapphire glass. Made from pure aluminium oxide (Al₂O₃ – Corundum), sapphire is one of the hardest known substances after diamond. Technically classified as a ceramic, its exceptional transparency gives it the optical advantages of a glass. These unique properties make sapphire glass the material of choice for applications demanding maximum heat resistance and extreme surface hardness.

Renowned for its scratch resistance, sapphire glass can only be scored by diamond. It is non-porous, chemically inert, and virtually insoluble — even in aggressive environments. Its optical transmission performance makes it a preferred choice for high-precision lenses, optical systems, and instrumentation requiring exceptional clarity and durability.

As a leading supplier of sapphire glass, John Moncrieff Ltd offers a wide range of sapphire products tailored to meet the demanding requirements of optical, electronic, medical, and industrial sectors.

Key Applications

• Optical Components: Lenses, windows, and prisms featuring high optical clarity and extreme surface durability.
• Electronics: Substrates for LED lighting, display panels, and micro-electronics; benefits from high thermal conductivity and electrical insulation.
• Medical Devices: Biocompatible and ultra-durable for surgical tools, implants, and diagnostic equipment.
• Industrial Applications: Protective covers, wear-resistant components, and high-temperature viewports.
• Luxury Watchmaking: Used in high-end timepieces (e.g. Rolex) for scratch-proof crystal glass faces.

Key Features

• Extreme Temperature Resistance: Operates continuously up to 1800 °C with ultra-low thermal expansion.
• Exceptional Hardness: Mohs scale rating of 9 — second only to diamond.
• High Tensile Strength: Maintains mechanical stability under load and temperature stress.
• Superior Abrasion Resistance: Only diamond can scratch its surface.
• Broad Optical Transmission: Minimal absorption from 0.25 µm to 5.0 µm wavelength range.
• Chemical Resistance: Immune to nearly all corrosive agents and solvents.
• Non-Porous Structure: Impervious to fluids and contaminants.
• Electrical Insulator: Excellent dielectric properties at high frequencies.

John Moncrieff Ltd — your trusted partner for precision sapphire glass solutions, engineered to perform under the most demanding optical, mechanical, and environmental conditions.

The technical data sheet and light transmission chart for sapphire glass are provided below for reference and specification comparison.