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Viewports
Viewport Sealing Methods and Specifications
Glass
Glass is fused to a thin nickel-iron metal transition.

 

 

 

 
Quartz
Quartz is metalized and brazed directly to stainless steel using a lead-silver braze alloy.

 

 

 
Sapphire
Sapphire is metalized and vacuum brazed to a nickel-iron sleeve using a tapered seal interface.

 

 

 
Pyrex®
A Pyrex® substrate is sandwiched between two elastomer seals. The outer elastomer (top in drawing) is for cushioning and the inner elastomer (bottom in drawing) makes the vacuum seal.
 

For more information on VacOptix® and other Insulator Seal specialty viewports, please visit www.insulatorseal.com.

 

Specifications

Viewport Type

Properties

 Bakeout Max Maximum Thermal Gradient  Materials Comments
 Zero Length Magnetic (CF) (ISO) Window Sleeve Braze
Glass Yes Yes
400°C
200°C
10°C/min
Borosilicate
NiFe
Fused
Matched expansion seal
Glass No No
400°C
200°C
10°C/min
Borosilicate
304ss
Fused
Housekeeper Seal
Quartz Yes No
200°C
200°C
25°C/min
SiO2
304ss
PbAg
Braze alloy melts at 305°C
Sapphire Yes Yes
450°C
200°C
25°C/min
Al2O3
NiFe
AgCu
Braze alloy melts at 800°C
 
 Related Topics
 Glass Transmission Curve
 Quartz Transmission Curve
 Sapphire Transmission Curve
 Viewports Introduction
 Glass Components Introduction