Mica Washers
Advanced Seals & Gaskets Ltd (ASG) supply a wide range of high-quality electrical insulation materials, including mica washers. Mica washers are precision components designed to provide electrical insulation, heat resistance, and mechanical strength in demanding applications.
Product Enquiry
For information on Mica Washers please complete the following quick enquiry or call us on +44(0)1384 252555.
Key Characteristics of Mica
- Colour: Muscovite (white) or Phlogopite (green)
- Sheet Size: 1000 x 1200 mm
- Thickness Range: 0.1mm – 50mm (depending on grade)
- Density: 2.6 – 3.2 g/cm³
- Temperature Range: 500°C – 1000°C (depending on grade)
- Flame Resistance: Flame retardant and non-flammable
- Chemical Resistance: Inert to water, most acids (except hydrofluoric and concentrated sulphuric acid), alkalis, conventional solvents, and oils
Full technical data can be supplied on request or downloaded from our online portal.
What Are Mica Washers?
Mica washers are flattened ring-shaped components used as insulating barriers between surfaces. They are designed to prevent electrical conduction, reduce friction, and support electrical conductors without permitting current flow.
Mica, the material used, is a naturally occurring mineral silicate available in two main types:
- Muscovite (white mica)
- Phlogopite (green mica)
Mica sheets can be rigid or flexible, bonded with resin, and come in thicknesses from 0.1mm to 50mm. They are supplied in sheet or roll form, making them suitable for conversion into washers in a wide range of sizes.
Why Use Mica Washers?
Mica washers are widely used in applications requiring thermal, electrical, and mechanical performance. They are ideal for:
- Protecting electrical conductors during installation, repairs, or use
- Heat shields in vehicles, aircraft, and industrial equipment
- Fire door fittings and other high-temperature environments
Their exceptional heat resistance, dielectric strength, and flame retardancy make mica washers a trusted choice for electrical insulation and high-performance thermal applications.
Benefits of Mica Washers
- Heat resistance up to 1200°C (rigid Phlogopite)
- Excellent flexural strength and easy to punch and machine
- High dielectric strength with low electrical conductivity
- Incombustible, asbestos-free, and halogen-free
- Chemical resistant to acids (excluding sulphuric acid), bases, oils, and solvents
These properties ensure mica washers maintain integrity under extreme conditions, providing reliable insulation and safety in critical electrical and thermal applications.
Other Electrical Insulation Materials
In addition to mica washers, ASG offers a wide range of electrical insulation materials, including:
- Epoxy Glass: Green sheets with mechanical strength, chemical resistance, radiation resistance, and temperatures up to 120°C.
- Valox: Excellent dielectric properties, chemical resistance, and operating temperatures from -40°C to 130°C.
- Leatheroid: Grey/blue paper gasket material for electrical insulation.
- MYLAR: Flexible polyester film with high dielectric strength and moisture resistance.
- Nomex: High-temperature resistant insulation with mechanical and dielectric strength.
- Presspahn: Brown kraft wood pulp-based material for mechanical and electrical applications.
- SRBF: Rigid resin-bonded fiber material, resistant to wear, impact, and chemicals, with low water absorption.
- SRBP (Synthetic Resin-Bonded Paper): Suitable for medium and high voltage applications, offering excellent electrical insulation.
- PTFE: Non-conductive plastic with excellent dielectric properties and high-temperature resistance.
- PVC: Tough, lightweight material resistant to abrasion, chemicals, moisture, and suitable for electrical insulation.
Applications of Mica Washers
Mica washers are commonly used in:
- Electrical and electronic devices for insulation and thermal management
- Industrial machinery for heat shields and protective layers
- Aerospace and automotive applications requiring high-temperature resistance
- Fire safety equipment such as fire doors and high-temperature barriers
Contact ASG for Mica Washers
For custom mica washers or further advice on electrical insulation materials, call 01384 252555 or submit an enquiry online. Our team can help you select the right material, grade, and finish to meet your exact application requirements.
Please contact us using the form below or by calling us on +44(0)1384 252555.