SAF Viewports can supply custom lens’ and specialty cut glass to order in many sizes, thicknesses and types of glass.

We also offer a wide variety of replacement lenses for viewing ports and peesites. Replacement gaskets are included with each lens purchase, except for the lenses in our rectangular view port products (gaskets for rectangular view ports must be ordered separately). In addition to our standard product lenses, SAF Viewports stocks glass of different sizes, materials, and coatings. Please contact us with your request.

Glass Options

Type Thickness Max. Intermittent Temperature Max. Continuous Temperature Code Letter
Quartz Clear 1/4″ 2048 °F / 1120 °C 1600°F / 871 °C Q
Borosilicate Clear 1/4″ 554°F / 290 °C 446°F / 230 °C B

Glass Types & Operating Standards

The different lens materials and their operating standards are explained below.

Quartz Clear – Designated by a “Q” in the model number. Maximum intermittent operating temperature is 2048°F. Maximum continuous operating temperature is 1600°F (Glass Only)*.

Borosilicate Clear – (borosilicate glass) Designated by a “B” in the model number. Maximum intermittent operating temperature is 554°F. Maximum continuous operating temperature is 446°F (Glass Only)*. Glass is heat strengthened for safety and is coated with a heat reflecting shield.