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Aluminosilicate Glass, Crystal Clear, High Light Transmittance

Aluminosilicate Glass refers to glass that has aluminum oxide in its composition. It is crystal clear and has good chemical stability, electrical insulation, mechanical strength and low thermal expansion coefficient. It is widely used for manufacturing gauge glass and sight glass. Moreover, aluminosilicate glass is also an integral part of mica-gasket-assembly. And mica gasket assembly is an accessory of liquid level gauge sight glass.

  • No surface defects
  • Great chemical resistance
  • Allowing for high operating temperature of up to 600 °C
  • Hydrolytic resistance
  • Acid & alkali resistance
  • A full range of sizes
  • Special discounts for large orders and various promotion campaigns
A piece of clear reflex gauge glass with four grooves is on the ground.

Reflex gauge glass is used to read the liquid level of the boiler or instruments and the grooves can make the liquid level clearer.

Specification

  • Color: colorless or slightly yellow
  • Shape: circular, rectangular
  • Density: 2.62–2.67 g/cm3
  • Transmissivity: 91.8%
  • Refractive index: 1.5325 (yellow)
  • Shock temperature: ≤ 370 °C
  • Softening temperature: ≥ 920 °C
  • Bending strength: 180–220 MPa
  • Working temperature: 600 °C
  • Working pressure: 200 MPa
Four pieces of circular aluminosilicate glass on the dark blue background.

Circular aluminosilicate glass for sight glass

Two pieces of rectangular aluminosilicate glass on the dark blue background.

Rectangular aluminosilicate glass for gauge glass

Aluminosilicate glass and borosilicate glass have similar properties. However, the former has greater chemical durability and can withstand higher operating temperatures. We may see these differences from the table below.

Comparison Table: Aluminosilicate Glass vs. Borosilicate Glass
Material Properties Aluminosilicate Glass Borosilicate Glass
Density (@ 18 °C) 2.630 kg/m3 2.230 kg/m3
Modulus of elasticity (Young’s) 81 GPa 64 GPa
Coefficient of linear expansion 4.60 × 10-6 °C 3.25 × 10-6 °C
Softening point 910 °C 821 °C
Thermal shock resistance 300 °C 160 °C
Index of refraction (@ 380–780 nm) 1.500 1.474
Working temperature (maximum) 660 °C 230 °C

Specification

  • Circular endoscopic: φ 10 mm – φ 800 mm; specifically, as follows: φ 28 × 16, φ 31.6 × 12.7, φ 33.16 × 16, φ 34 × 17 (unit: mm)
  • Rectangular glass: generally processed into glass level gauge, up to 1600 mm; specifically, as follows: 80 × 24 × 17 , 80 × 24 × 21 , 95 × 34 × 17 , 108 × 24 × 21 ,108 × 24 × 17, 115 × 34 × 17, 118 × 24 × 17, 118 × 24 × 21, 130 × 24 × 17, 130 × 24 × 21, 130 × 26 × 19, 140 × 34 × 17, 190 × 34 × 17, 218 × 34 × 17, 220 × 34 × 17, 250 × 34 × 17, 265 × 26 × 19, 280 × 34 × 17, 320 × 34 × 17, 340 × 34 × 17, 370 × 34 × 17, 400 × 34 × 17 (unit: mm)
  • Thickness: 12.7 mm 16 mm 17 mm 19 mm 21 mm

Technical Notes:

  • The thickness of the various non-standard aluminosilicate glass can be customized.
  • Other sizes can be customized.

Application

Rectangular aluminosilicate glass is generally processed into glass level gauge of all sizes while round aluminosilicate glass is generally processed into all types of sight glass.

A piece of gauge glass made of aluminosilicate glass.

Rectangular aluminosilicate glass is processed into gauge glass.

A piece of flange sight glass made of aluminosilicate glass.

Round aluminosilicate glass is commonly used for sight glass.

An array of tubular gauge glass is vertically placed on the desk.

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