glass material

Guide to Glass Substrates: Composition, Properties, and Application

This guide details glass substrates by core material composition—from common soda-lime to advanced aluminosilicate and specialty types like quartz and sapphire. Each type's unique properties determine its ideal use in architectural, electronic, and optical applications.

Core Material Compositions: Comparison

1.Soda-Lime-Silica Glass (Standard Float Glass)

•Primary Advantages: Cost-effective, excellent optical quality, readily available in large sheet sizes, highly suitable for all standard processing (cutting, tempering, laminating, coating).

•Typical Applications: Windows, mirrors, furniture tops, home appliance, and as the base glass for tempered, laminated, and coated products.

Material Composition
~70-75% silica, 12-16% soda, and 10-15% lime
Key Characteristics
Good optical clarity, ease of fabrication, moderate thermal expansion, lower softening point.
Typical Thickness Range
2mm to 19mm
Leading Brands
AGC, Xinyi Glass, CSG

2.Borosilicate Glass (High-Borate Glass)

•Primary Advantages: Superior thermal shock resistance, high-temperature stability, excellent chemical resistance, and good mechanical strength.

•Typical Applications: Laboratory glassware, high-power lighting covers, industrial sight glasses, cookware, and certain high-performance optical components.

Material Composition
~70-80% silica and significant boric oxide (5-13%); often referred to as "hard glass."
Key Characteristics
Very low coefficient of thermal expansion (1/3 of soda-lime), exceptional thermal shock resistance, high chemical durability.
Typical Thickness Range
Commonly from 1mm upwards for panels, and various tubing thicknesses.
Leading Brands
Corning, Schott

3.Aluminosilicate Glass (High-Alumina Glass)

•Primary Advantages: Exceptional durability, high resistance to scratches and impacts (especially after chemical strengthening), excellent optical clarity, and good flexibility in thin forms.

•Typical Applications:Cover glass for smartphones, tablets, and displays; touch sensors; protective windows for industrial and military equipment.

Material Composition
High percentage of alumina (Al₂O₃, typically 15-25%) alongside silica and alkali oxides.
Key Characteristics
Significantly higher mechanical strength, surface hardness, and higher softening temperature. Ideal substrate for chemical strengthening.
Typical Thickness Range
Often used in thinner applications (0.3mm to 2.0mm), but also available in thicker sheets.
Leading Brands
Corning (Gorilla® Glass), AGC (Dragontrail™), Panda, Schott.

4.Other Specialty Glass

These highly specialized materials are engineered for extreme performance requirements, offering properties far beyond standard glass compositions.

Quartz Glass (Fused Silica)

• Key Properties: Exceptionally high-purity silica glass with outstanding thermal shock resistance and transmission from deep UV to near IR. It has an extremely high working temperature.

• Typical Applications: High-temperature lamps, optical fibers, and semiconductor manufacturing equipment.

Sapphire Glass

• Key Properties: A crystalline form of aluminum oxide, not technically a glass, but used as a glass substrate. It is one of the hardest and most scratch-resistant transparent materials available.

• Typical Applications: High-end watch faces, camera lens covers, and protective windows in harsh environments.