GLASS AND TUBING FOR LEVEL GAUGES

Annealed Borosilicate - Clear

Good for normal service where one surface is heated to a maximum temperature of 446°F (230°C), using 1/4" or thicker glass. The temperature difference between ambient and process should not exceed 150°F.

Tempered Borosilicate - Clear

Recommended for use where higher pressures are required than can be obtained with Annealed Borosilicate. Maximum service temperature is 500°F (260°C). No corrosion to surface, nor severe chill can be tolerated.

Cobalt Blue Furnace - Blue

Used to reduce glare when observing flame, smoke, and ash intensity in power plants and marine boilers. Thickness up to 1/4".

Vycor - Clear

Can be used continuously at 1652°F (900°C). The temperature difference between ambient and process surfaces should not exceed 600°F. Thickness up to 1/2". Excellent optical properties.

Fused Quartz - Clear

For industrial and laboratory applications. Can be used continuously at 1742°F (950°C). Commercial Grade is standard. Optical Grade is available.

Pyroceram - Amber Tint

This transparent glass-ceramic material will not delaminate at elevated temperatures. Available in 5 mm thickness only. Mainly used in furnaces.

Glass For:

• Furnaces, Ovens
• Observation Equipment
• Flow Indicators
• Pressure Vessels/Tanks

Tempering

Tempering greatly increases the strength of glass and helps it overcome the damaging effect of scratches and other surface defects. Glass is heated to a specified point above its annealing temperature, then quickly quenched causing the surface to shrink and harden. While the interior cools more slowly it tries to shrink, putting itself in tension and creating a compressive stress on the surface. When completed, the surface compression must be overcome and a tensile stress introduced before the glass can be harmed. Thus, the mechanical and impact strength as well as the thermal shock resistance are improved greatly.