MARKETS
Gage Glass Shields
Mica Shields
Mica Shields are used with process media that will corrode glass. The most common is steam above 2069 KPaG (300 PSIG) Working Steam Pressure (WSP). Transparent glass must be used to provide a flat surface to back the shield. Mica is a laminate type, naturally occurring material resistant to alkaline and can be used in high temperatures. As a layer of mica degrades in service, a new layer is exposed.
PCTFE (Formerly Kel-F) Shield
PCTFE shields are a common alternative to mica shields and extremely resistant to chemical corrosion but ineffective in steam service. These shields are most commonly used in hydrofluoric acid service. It should be noted that PCTFE is available in varying degrees of optical quality. While a PCTFE shield is not completely transparent, Jerguson shields are extremely clear and contain a minimal milky-white appearance. This milky-white appearance is prevalent with third-party product and can make it extremely difficult to read the level in the gage.
Mica Shields are used with process media that will corrode glass. The most common is steam above 2069 KPaG (300 PSIG) Working Steam Pressure (WSP). Transparent glass must be used to provide a flat surface to back the shield. Mica is a laminate type, naturally occurring material resistant to alkaline and can be used in high temperatures. As a layer of mica degrades in service, a new layer is exposed.
PCTFE (Formerly Kel-F) Shield
PCTFE shields are a common alternative to mica shields and extremely resistant to chemical corrosion but ineffective in steam service. These shields are most commonly used in hydrofluoric acid service. It should be noted that PCTFE is available in varying degrees of optical quality. While a PCTFE shield is not completely transparent, Jerguson shields are extremely clear and contain a minimal milky-white appearance. This milky-white appearance is prevalent with third-party product and can make it extremely difficult to read the level in the gage.
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