METAGLAS® Type 275 — Circular Sight Glass for Glass-Lined Pressure Vessels
The METAGLAS® Type 275 is a circular metal-fused sight glass
engineered specifically for glass-lined pressure vessels.
Its advanced METAGLAS® construction places the borosilicate glass under permanent compressive stress,
delivering exceptional durability, pressure resistance, and failsafe performance in corrosive and
high-temperature environments.
Design & Construction
Application: Direct mounting on glass-lined pressure vessels and reactors
Glass Type: METAGLAS® metal-fused borosilicate with ultra-high mechanical strength
Body Material: Stainless steel (1.4404 / 316L) or alloy per application requirements
Sealing: Flat gasket or O-ring sealing depending on vessel design
Profile: Circular, compact design with maximum viewing area
Compatibility: Suitable for corrosive, solvent-based, and high-purity processes
Operating Envelope: Pressure and temperature ratings available on request
Applications
Glass-lined reactors and pressure vessels
Agitated vessels and mixing tanks
Chemical synthesis and speciality chemicals
Pharmaceutical and high-purity processing
Solvent handling and corrosive media environments
Key Advantages:
Designed expressly for glass-lined pressure vessels
Metal-fused glass prevents catastrophic failure and delamination
Outstanding chemical resistance and thermal shock capability
Optimised for cyclic pressure and temperature duties
Long service life with stable, distortion-free visibility
When ordering, specify vessel interface dimensions, pressure/temperature requirements, glass size, and gasket/seal material.
John Moncrieff Ltd will configure your METAGLAS® Type 275 sight glass to suit your glass-lined vessel
and process conditions, complete with PED/QA documentation.
