MDC Weldable Pyrex® Viewports deliver a cost-effective and practical solution for high vacuum systems requiring intermittent glass replacement due to material buildup or coating deposition. Constructed with Corning type 7740 Pyrex® glass, these viewports offer excellent thermal stability and optical clarity, making them ideal for vacuum coating systems or environments with high particulate exposure.

The replaceable Pyrex® disc is sealed using a Viton® O-ring and secured with an aluminum retaining flange, ensuring a leak-tight seal while preventing metal-to-glass contact through a built-in cushion gasket. This eliminates point-stress damage, preserving the integrity of the glass during service.

The viewport features a 4 in (101.6 mm) outer diameter weld neck and is designed for operating conditions down to 1x10⁻⁸ Torr.

Industry Applications

Weldable Pyrex® Viewports are ideal for vacuum coating systems, thermal evaporation, sputtering chambers, optical inspection ports, and process monitoring environments where frequent glass replacement is necessary. Their design supports easy maintenance while maintaining vacuum integrity and long-term durability, making them essential for applications with optical degradation over time.