Mica Gaskets

Mica Gaskets

Advanced Seals & Gaskets Ltd stocks and processes a wide range of electrical insulation materials—including papers, resins, laminates, and plastics—through well-established supplier networks. One standout among these is mica. We supply mica in both rigid and flexible forms, then manufacture it into custom gaskets that match your exact specifications.

Mica sheets are created by bonding mica paper layers with resin and curing them into boards of various thicknesses (from 0.10 mm up to 50 mm). Available in sheet or roll format, we can convert these into gaskets to your drawing or sample. Whether you need a simple rectangle or a complex multi-hole gasket in batches of one or thousands, we rely on our presses and CNC machinery to deliver a precise, high-quality result.

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For information on Mica Gaskets please complete the following quick enquiry or call us on +44(0)1384 252555.






    Key Key Characteristics of Mica

    • Colour: Available in muscovite (white) and phlogopite (green) variants

    • Sheet Size: 1000 × 1200 mm

    • Thickness Range: 0.10 mm to 50 mm (depending on grade)

    • Density: 2.6 – 3.2 g/cm³

    • Temperature Tolerance: Typically 500 °C up to ~1000 °C depending on grade

    • Flame Resistance: Inherently flame-retardant and non-flammable

    • Chemical Stability: Resistant to water and many acids (excluding hydrofluoric and concentrated sulphuric), alkalis, standard solvents and oils

    Complete technical data is available for download or on request.

    Download Product Specification Sheet

    What are Mica Gaskets?

    Mica gaskets are used in electrical insulation applications to prevent unintended current flow. They act as spacers, gap fillers, or insulating barriers, cut into shapes like strips, pads, washers or intricate forms.

    Mica, a group of silicate minerals including muscovite and phlogopite, can be manufactured in rigid or flexible forms depending on application constraints. These gaskets help maintain electrical isolation while providing structural support where required.

    Why use Mica Electrical Insulation Gaskets?

    Mica gaskets are ideal when you need to isolate electrical conductors safely without compromising mechanical integrity. Their benefits include:

    • Electrical insulation (high dielectric strength)

    • Thermal performance (good heat transfer and stability)

    • Flame resistance, making them safer in high-heat environments

    • Mechanical strength helps prevent gasket failure under stress.

    Typical applications include fire doors, heat shields in vehicles, industrial equipment, and aerospace components.

    Benefits of Mica

    • Can withstand temperatures up to 1200 °C (especially with rigid phlogopite mica)

    • Strong flexural properties and easy to punch, machine or cut

    • Excellent dielectric properties with minimal electrical conductivity

    • Asbestos- and halogen-free

    • Durable in the presence of oils, solvents, acids (except robust sulphuric) and bases

    Other Types of Electrical Insulation Materials Available

    We offer a wide selection of insulating materials to complement or substitute mica, depending on your design needs:

    • Epoxy Glass – mechanically strong; chemical, electrical, and radiation resistant

    • Kapton – flexible, high-temperature polyamide for demanding applications

    • Leatheroid (Elephantide) – grey-blue paper used in insulation for heating elements

    • Mylar – high-dielectric polyester film with excellent moisture and electrical resistance

    • Nomex – high-temperature, mechanically harsh, dielectric insulation

    • Presspahn – Kraft-pulp-based brown sheets used in electrical insulation

    • SRBF / SRBP – synthetic resin-bonded fibre/paper materials for medium/high voltage

    • Valox – flame-retardant thermoplastic

    • PTFE – non-conductive plastic for extreme-temperature and chemical applications

    • PVC – cost-effective, durable dielectric option

    Advantages of Using Mica Gaskets

    • High temperature resistance, making them ideal for furnace, thermal, and exhaust applications

    • Chemical resilience and durability help ensure a long service life.

    • Rigid and flexible variants allow custom use in many assemblies.

    • Muscovite mica is prized for its dielectric strength and is commonly used in electrical applications.

    • Phlogopite mica provides superior heat resistance and low thermal conductivity—perfect for harsh environments.

    • As both are dielectric, they prevent electrical conduction while supporting structural integrity in devices like circuit boards, niche industrial machines, and medical equipment.

     

    Have a Question About Mica Gaskets?

    Please contact us using the form below or by calling us on +44(0)1384 252555.