ISO-QF (KF) UV Grade Fused Silica Viewport


  • Vacuum rating of 1×10-8 torr
  • Temperature maximum of 200°C
  • ISO-QF (KF, NW) flange
  • Body is manufactured from 304 stainless steel
  • Viewing window is manufactured from UV grade fused silica
  • Transition material is Kovar
  • Avoid thermal changes in excess of 10°C/minute
  • Do not expose to pressure above 1 atmosphere


  • Window material: Corning HPFS 7980 Fused Silica or equivalent
  • TWD < 10λ @ 632nm (peak to valley)
  • Parallelism < 30 arc minutes
  • Surface finish: 40/20 scratch-dig
  • Thermal range: -100°C to 200°C
  • Homogeneity grade: F
  • Inclusion class: 2
  • Leak rate < 1 X 10-9 atm-cc/sec He

Available Options: Call for price and delivery

  • All Titanium Viewports
  • Weld Adapters
  • Re-entrant Design
  • ISO Flanges
  • AR Coating for 1550nmAR Coating for 808nm
  • Dual AR Coatings
  • EUV Grade (Excimer) Viewports
  • IR Grade (Low OH) Viewports
  • Geochronological Viewports
  • Custom viewports and coatings

*Dimensions are in inches unless otherwise specified

Part IDReference NumberDescription Flange Size View Diameter 3D CADDrawingUnit PriceIn StockQty, Add To Cart
Part ID9110012Reference NumberQF25-ZLVP-Q-UV-0.63Description QF25 UV Grade Fused Silica ViewportFlange Size 1.57View Diameter 0.633D CADLoginDrawingLoginUnit Price$248.00Contact
Part ID9110013Reference NumberQF40-ZLVP-Q-UV-1.40Description QF40 UV Grade Fused Silica ViewportFlange Size 2.16View Diameter 1.43D CADLoginDrawingLoginUnit Price$250.00Contact
Part ID9110014Reference NumberQF50-ZLVP-Q-UV-1.40Description QF50 UV Grade Fused Silica ViewportFlange Size 2.95View Diameter 1.43D CADLoginDrawingLoginUnit Price$305.00Contact