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Metal Fused Sight Glasses – METAGLAS
Metaglas sight glasses are available in a wide variety of options for viewing inside processes.
Metaglas
Metaglas – metal-fused sight glasses replace conventional sight glass discs as unexpected catastrophic failure and rupture are eliminated.
Metaglas is made of a series of sight-window products of unmatched strength and integrity. They are made by melting glass inside a metal ring. This results in the fusion of glass and metal. Upon cooling, the glass solidifies and the difference in the linear coefficient of thermal expansion between glass and metal then produces forces that create uniform compressive stress throughout the glass. Because the glass prevents the metal ring from shrinking to its theoretical size, it remains in tension.
This high degree of mechanically induced compressive stress makes METAGLAS the strongest and most secure glass for sight window or visual flow indicator applications.
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METAGLAS is a registered trade name of Herberts Industrieglas and has been exclusively distributed by CMC Technologies in Australia, New Zealand, and the Oceania region since 1999.
Selection of Sight Glasses
Sight glasses will be subjected to forces involving pressure, temperature, thermal shock, caustics, abrasion, or impact. When a sight glass fails catastrophically, it can cause severe operator injury and even death. Sight glass failure also has an impact on plant downtime, product contamination, and product loss. Metaglas was developed to overcome all these issues.
When choosing a sight glass, the following considerations should be made to evaluate the compatibility of the sight glass.
- Temperature
- Thermal Shock
- Corrosion
- Abrasion
- Pressure
- Impact
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Mataglas Materials
Metaglas can be manufactured to suit tri-clamp ferrules and clamps, ANSI Flanges as an insert or fully bolted designs, and is available in threaded NPT or BSB configurations. Metaglas complies with the manufacture of fused sight glasses according to DIN7079 “Pressure-resistant glass-to-metal fused panes for sight glasses for mounting between flanged frames”.
The majority of Metaglas sight glasses use borosilicate glass fused to either duplex stainless steel, Hast C, or Carbon Steel.
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CUSTOM SIZING AVAILABLE ON REQUEST
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Metaglas Type 73 Metal Fused Sight Glass Disc
- Sight glass fused to metal conforming to DIN 7079
- As a replacement for conventional glass discs in the following assemblies:
- Circular sight ports to DIN 28120 or DIN 28121 or similar
- Screwed sight glasses similar to DIN 11851
- Sight flow indicators
- Temperature: -60°C to +300°C depending on ring material
- Pressure: up to 64 bar (TÜV) – higher pressures possible
- Borosilicate glass to DIN 7080
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Metaglas Type 73.SW Metal Fused Sight Glass Disc with Wiper
- Type 73 is also available with wiper as Type 73.SW
- Wipers may be used to prevent the crystallisation of media onto the glass and to remove dust & dirt
- Centrally operated wipers are mounted through the sight glass disc on either DIN 28120 (DN50-200), DIN 11851 (DN65-125) or similar sight glasses
- Wiper blades can be silicon rubber, PTFE and others
- All product contact parts are stainless steel
- O-rings: Viton
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Metaglas Type 76/176 Metal Fused Sight Glass Disc for DIN Flanges/ANSI B16.5 Flanges
- Sight glass fused to metal conforming to DIN 7079
- As a replacement for conventional glass discs in the following assemblies:
- Circular sight ports to DIN 28121 or similar
- Any other assemblies where the glass is of the same dimensions, e.g. weld neck flanges with flat or raised face
- Temperature: -60°C to +300°C depending on ring material
- Pressure: up to 40 bar (TÜV) – higher pressures possible
- Borosilicate glass to DIN 7080 / DIN 7079
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Metaglas Type 11 Metal Fused Bolt-on Sight Glass Disc for DIN Flanges
- Sight glass fused to metal conforming to DIN 7079
- TÜV-Approval in accordance with the governing standards (for pressure vessels) (PN6 to PN40); with Carbon Steel (DIN 1.0570) or Duplex Stainless Steel (DIN 1.4462)
- ·Reliability against total failure. The possibility of unexpected rupture is excluded
- Long working life
- Smooth, easy clean surface
- Maximum viewing diameter coupled with minimum build height
- Temperature: –80°C to +300°C depending on ring material
- Pressure: up to PN100 for Type 11, up to PN50 for Type 13 – higher pressures possible
- Borosilicate glass to DIN 7080 / DIN 7079
- Important: Requires parallel flat face mounting flange and full gasket
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Alternative Options to Type 11
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Metaglas Type 80 Metal Fused Sight Glass Disc for Tri-clamp Fittings DIN32676
- Sight glass fused to metal conforming to DIN 7079
- Metaglas sanitary clamp fittings to DIN 32676 / ISO 2852
- Extremely compact construction
- Reliability against total failure. The possibility of unexpected rupture is excluded
- Fast & simple installation & maintenance
- Extreme resistance to impact and temperature
- Maximum viewing diameter coupled with minimum build height
- Temperature: -60°C to +300°C depending on ring material
- Pressure: -1 to +16 bar
- Borosilicate glass to DIN 7080 as standard, also available in Soda Lime (Type 80.SL – see options)
- Also available with Lumiglas Luminaires – see options below
Alternative Options to Type 80
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