sealing gasket
Water Level Gauge — Mica Sealing Assembly - Image 2

Water Level Gauge — Mica Sealing Assembly

Mica gaskets are flexible high-temperature sealing and insulating components made from natural mica sheets or mica paper assemblies. They provide excellent thermal stability, electrical insulation and low creep for heater elements, lamp fittings, thermal equipment and electrical enclosures. Custom sizes and reinforced versions available.

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Description

The Water Level Gauge Mica Sealing Assembly is a purpose-designed gasket and mounting set for liquid level indicators and sight-glass fittings used in boilers, steam heaters, pressure vessels and industrial tanks. The assembly typically comprises a precision-cut mica gasket (pure or reinforced), an insulating washer or spacer, and a stainless-steel clamping/retaining ring to ensure even compression and reliable sealing under thermal cycling. Mica’s high temperature resistance and excellent dielectric properties make these assemblies ideal where seal integrity and electrical isolation close to heaters or live elements is required.

Key benefits

  • High-temperature performance: mica withstands elevated temperatures where polymer gaskets would fail.

  • Electrical insulation: excellent dielectric strength for safe use near live heating elements.

  • Low creep & dimensional stability: preserves flange compression during thermal cycling.

  • Compact, precision fit: die-cut parts and metal clamping rings ensure uniform sealing pressure and easy installation.

  • Optional reinforcement: foil- or metal-backed variants improve handling and mechanical protection in harsh environments.

  • Customisable kits: supplied as complete assemblies (gasket + washer + clamping ring) or as individual components for retrofits.

Applications & industries

  • Boiler water level gauges and sight-glass assemblies

  • Steam and hot-water heaters, heat exchangers and pressure vessels

  • Industrial ovens, kilns and thermal process equipment

  • Power plants, HVAC and boiler houses

  • Chemical and petrochemical plants where insulated sealing is needed near heating elements

  • OEM appliance manufacturing (industrial heaters, industrial lamps)

Why choose Water Level Gauge Mica Sealing Assembly?

Mica sealing assemblies are purpose-built for the unique demands of water level gauges and sight-glass fittings: proximity to heat sources, need for electrical isolation, and frequent thermal cycles. Our assemblies combine precision-cut mica gaskets with engineered metal clamping rings to deliver leak-resistant sealing, long-term dimensional stability and safe dielectric performance — reducing maintenance and downtime in boilers, heaters and industrial process equipment. Choose our kits when you need a tested, easy-to-install sealing solution that protects fragile gauge components while maintaining reliable sealing under the toughest thermal and electrical conditions.

Typical technical specifications

 

Base material Natural mica (muscovite or phlogopite) sheet, mica paper assemblies.
Available thicknesses Typically 0.2 mm – 3.0 mm (other thicknesses on request).
Service temperature commonly up to 400–800 °C depending on grade and atmosphere
Dielectric strength Depends on construction — typical mica sheets withstand several hundred °C; reinforced/treated grades often used up to ~500–800 °C in non-oxidising or limited-exposure conditions
Dielectric strength High — suitable for electrical insulation duties (refer to grade datasheet for kV/mm values).
Compressibility / recovery Low creep and good recovery compared with soft polymer gaskets.
Chemical resistance Good resistance to many oils and non-oxidising chemicals; avoid prolonged exposure to strong acids/alkalis unless using a confirmed compatible grade.
Mechanical reinforcement Available with thin stainless steel backing (1–0.2 mm) for improved tensile strength and handling.

Materials & construction options

  • Pure mica sheet: unbacked natural mica layers, thin and highly insulating.

  • Reinforced mica: mica bonded to a thin stainless steel foil for strength and ease of handling.

  • Adhesive-backed mica: for quick assembly to heater plates or fixtures.

  • Metal-clad / foil-faced: stainless foil on one or both sides for EMI/grounding or mechanical protection.

  • Composite assemblies: mica + gasket cushion layers or mica + silicone/ceramic coatings for special wear or sealing needs.

  • Custom die-cut gaskets: to match OEM profiles, bolt patterns and cutouts.

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