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A borosilicate sight glass fused to a metal ring. A unique combination of glass and metal places the glass in compression, creating an amazingly strong and reliable sight glass. METAGLAS® is the No. 1 selling sight glass, installed in more locations around the world. Clamp-style, bolt-on, weld-on, and threaded models available. L.J. Star is your borosilicate sight glass supplier!

If products below do not suit your needs please click here for METAGLAS® products overview.

MetaClamp® Sanitary Sight Glass Window
The strongest, safest, most reliable sight glass.
  • Mounting: Sanitary clamp connection
  • Glass: Borosilicate to DIN7080
  • Metal: Duplex or Hastelloy
  • Up to 572° F.
  • FV to 230 psi
  • Approvals: USP Class VI, BPE Compliant, USP Type I borosilicate glass
  • Sizes: 1/2 to 12 inches
Sanitary Hinged Sight Glass Assembly
  • Mounting: Sanitary ferrule
  • Glass: Borosilicate to DIN7080
  • Metal: Stainless steel or Hastelloy
  • Up to 572° F.
  • Up to 150 psi
  • Ratings and approvals: USP Class VI, BPE Compliant, USP Type I borosilicate glass
  • Sizes: 4 to 12 inches
Heated Sight Glass MetaClamp® For Fog-free Viewing
  • Mounting: Sanitary clamp connection
  • Glass: Borosilicate to DIN7080
  • Metal: Duplex or Hastelloy
  • Up to 572° F
  • FV to 230 psi
  • Approvals: USP Class VI, BPE Compliant, USP Type I borosilicate glass
  • Sizes: 1 to 12 inches
  • Power: 24V
Fused Sight Glass Assembly for Glass Lined Reactors
  • Mounting: Flanges for glass lined reactors
  • Glass: Soda lime
  • Metal: Glass lined
  • -60 to 250° F.
  • Designed for flange pressure class
  • Approval: TÜV
  • Sizes: 2 to 8 inches
Hinged Sight Glass Assembly with METAGLAS®, Weld-On or Bolt-On
  • Mounting: Weld-on or bolt-on (ANSI Class 150#)
  • Glass: Borosilicate to DIN7080
  • Metal: Carbon or stainless steel
  • Up to 572° F.
  • Up to 150 psi
  • Ratings and approvals: PED, DIN7079, TÜV
  • Sizes: 3 to 8 inches
Industrial Threaded Sight Glass Window, METAGLAS®
  • Mounting: Male NPT Connection
  • Glass: Borosilicate to DIN7080
  • Metal: Stainless steel or Hastelloy
  • Up to 572° F.
  • 1/4 – 2 inches 100 bar, 1450 psi
  • 3 inches – 50 bar, 725 psi
  • Sizes: 1/4 – 3 inches
Aseptic Sight Glass Window
Design eliminates ferrule dead lag.
  • Mounting: NA ConnectTM or TCI BoltConnect®
  • Glass: Borosilicate to DIN7080
  • Metal: Stainless Steel or Hastelloy
  • Up to 572° F.
  • Up to 100 psi
  • Ratings and approvals: USP Class VI, BPE Compliant, USP Type I borosilicate glass
  • Sizes: ½ to 6 inches
METAGLAS®, Bolt-on Sight Glasses to ANSI B16.5 Type 13
Sight glass window designed for full-face connection to an ANSI flange.
  • Mounting: ANSI or DIN Flange
  • Glass: Borosilicate
  • Metal: Carbon, stainless steel or Hastelloy
  • Up to 572° F
  • Pressure per flange class
  • Ratings and approvals: PED, DIN7079, TÜV
  • Sizes: 1-1/2 to 8 inches
METAGLAS® Sight Glass Disc, Type 73
Sight glass disc for DIN28120 and other weld-type sight glass assemblies.
  • Mounting: Weld-on DIN28120 or similar assembly
  • Glass: Borosilicate to DIN7080
  • Metal: Carbon, stainless steel or Hastelloy
  • Up to 572° F.
  • Up to 900 psi
  • Ratings and approvals: PED, DIN7079, TÜV
  • Sizes: 1 to 5 inches (view)
METAGLAS® Sight Glass Disc with Wiper, Type 73 SW
  • Mounting: Any sight glass assembly
  • Glass: Borosilicate to DIN7080
  • Metal: Carbon, stainless steel and Hastelloy
  • Up to 302° F.
  • Up to 230 psi
  • Ratings and approvals: PED, DIN7079, TÜV
  • Sizes: 3 to 8 inches (view)
Why METAGLAS Windows from L.J. Star
Webcast: How to Ensure Sight Glass Safety - Tutorial