FURNACE OBSERVATION GLASS

Our Furnace Observation glass and/or observation ports are manufactured by Corning® and is a dark cobalt blue glass. Furnace Observation glass is a low expansion glass for added heat resistance in furnace site glass applications. The cobalt blue color is designed to view flame for accurate settings or readings and still protect the viewer from harmful IR and UV rays. We carry 12" square blanks that can be ground and polished to the desired size and thickness.

Corning 5331®: Furnace Observation Glass
Glass Code: Corning®
5331
Type
Borosilicate
Color
Cobalt Blue
Principal Use
Furnace Observation
Thermal Expansion (Multiply by 10-7 cm/cm/°C)
0 -300°C
50.0
Thermal Stress Resistance °C
16

Viscosity Data

(Data is Subject to Normal Manufacturing Variations.)

Strain Point °C
16
Annealing Point °C
474
Softening Point °C
720
Density g/cm3
2.28
Dielectric Properties
Dielectric Constant
7.2
Loss Factor %
6.5
Refactive Index
1.490

 

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