Mica Gaskets — High-Temperature Insulation & Sealing
sealing gasket

Mica Gaskets — High-Temperature Insulation & Sealing

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

Mica gaskets are manufactured from natural mica (muscovite/phlogopite) sheets or mica paper bonded with high-temperature inorganic/organic binders and — where required — reinforced or clad with thin stainless steel foil. The result is a thin, dimensionally stable gasket material that combines outstanding thermal resistance, electrical insulating properties and low cold-flow behavior under compression. Mica gaskets are widely used where reliable sealing and electrical insulation are needed at elevated temperatures or in close proximity to heating elements.

They are supplied as flat sheets, adhesive-backed pieces or precision die-cut gaskets to match customer flange shapes, heating plate holes or lamp assemblies. Standard formats are supplied for quick replacement; bespoke gaskets are available for OEM applications.

Key benefits

  • High temperature resistance — suitable for many applications close to heating elements and kilns.

  • Excellent electrical insulation — low dielectric loss and high breakdown voltage for electrical / heater applications.

  • Low creep & dimensional stability — maintains sealing force under thermal cycling.

  • Thin, compact profile — ideal where space is limited around elements or fittings.

  • Multiple construction options — pure mica sheets, reinforced mica (metal-backed), adhesive backed or metal-clad for enhanced mechanical strength and ease of installation.

  • Customisable — cut-to-size, die-cut or slotted to customer drawings for direct replacement of OEM parts.

Typical applications

  • Electric heating elements, cartridge heaters, band heaters and heater plates.

  • Lamp fixtures, light housings and high-temperature lamp insulators.

  • Kilns, furnaces and thermal processing equipment.

  • Electrical panels, terminal blocks and high-temperature cable pass-throughs.

  • Glass, ceramics and foundry equipment where thermal stability and insulation are required.

  • HVAC, burners and industrial ovens.

  • OEM appliance manufacture and maintenance spare parts.

Why choose our Mica Gaskets?

Our mica gaskets combine proven natural mica insulation with flexible, customer-focused manufacturing: we offer pure mica sheets for maximum dielectric performance, plus reinforced and metal-clad options where handling, grounding or mechanical protection is needed. Each gasket is cut or finished to your drawing tolerances and inspected for dimensional accuracy — giving you reliable high-temperature sealing, consistent electrical insulation and long service life in heater, lamp and thermal equipment applications. For critical installations we provide grade recommendations and datasheets to ensure the correct mica type and construction for your temperature, atmosphere and electrical safety requirements.

Typical technical specifications

 

Base material Natural mica (muscovite / phlogopite) sheets or mica paper with binder.
Available thicknesses Typically 0.2 mm – 3.0 mm (other thicknesses on request).
Sheet sizes Common sheet sizes and custom cut pieces; typical sheet face sizes supplied on request.
Maximum service temperature 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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