ISO 80 Vacuum Viewport — ISO 80 Sight Glass for High Vacuum
ISO 80 Vacuum Viewport — ISO 80 Sight Glass for High Vacuum - Image 2
ISO 80 Vacuum Viewport — ISO 80 Sight Glass for High Vacuum - Image 3

ISO 80 Vacuum Viewport — ISO 80 Sight Glass for High Vacuum

ISO vacuum sight glass for compact high-vacuum systems. Borosilicate, fused silica & sapphire options. Quick-fit KF/DN flange with optional AR coatings.

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Description

A ISO-80 vacuum sight glass (ISO80 viewport) is a compact, clamp-style flanged optical window engineered for vacuum process observation, alignment and in-chamber inspection. The window is sealed to a stainless-steel KF flange using vacuum-compatible methods (Viton O-rings or metal gaskets), delivering reliable vacuum integrity and repeatable sealing performance. Typical window materials include borosilicate glass, fused silica (quartz) and sapphire — selected according to transmission requirements, thermal resistance and process conditions.

Key Benefits

  • ISO 80 flange — compatible with standard KF hardware (clamps, centering rings, and O-rings) for quick installation and removal.
  • High-vacuum compatible sealing — O-ring or metal-sealed construction ensures low leak rate and repeatable performance.
  • Material options — optical borosilicate, fused silica (quartz) for UV, or sapphire for the highest mechanical/thermal robustness.
  • Compact and easy to use — ideal for small systems or quick-access optical ports.
  • Custom sizes and materials — ISO63 / ISO80 / ISO100 versions also available; CAD drawings and small-batch manufacturing supported.

Why choose the ISO 80 viewport？

ISO  sight glasses are widely used where compact, reliable optical access is required in vacuum systems. The clamp-style KF connection enables rapid assembly and maintenance without specialized tools. Quartz and sapphire options support elevated bakeout temperatures and superior transmission for lasers, spectroscopy and plasma monitoring. Provide your operating pressure, maximum temperature and optical wavelength and our engineering team will recommend the optimal window material, surface quality and sealing configuration.

Typical Technical Specifications

Product model ISO80
Product vacuum degree 1E*10-12 pa·m³/s
Flange material 304
Glass material Borosilicate / Quartz (Fused Silica) / Sapphire / Barium Fluoride / Calcium Fluoride / Zinc Selenide
Surface quality 60/40, 50/20, 20/10
Optical surface type 1/2 – 1/10
Visible diameter (mm) 53
Heat resistance range -50 ～ 230℃
Surface treatment Electrolytic polishing
Transmittance 1.45 ～ 1.57
Center distance(mm) 87
Inner diameter (mm) 95
Product Height(mm) 68
Thickness 27
Glass thickness 10

Applications & industries

  • Semiconductor equipment (process monitoring, plasma observation).

  • Vacuum coating & thin-film deposition systems.

  • Laboratory and R&D vacuum chambers.

  • Laser alignment & spectroscopy setups.

  • Analytical and measurement instruments.

  • Optical diagnostics in high-vacuum environments.

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