What is Silicone Mica Muscovite?

It is a high-temperature electrical insulation material made from muscovite mica paper bonded with silicone resin. It offers excellent dielectric strength, arc resistance and heat stability.

What temperature can it withstand?

Muscovite grades typically withstand 500–550°C continuous service. Short-term peaks can be higher depending on the specific grade.

How does Muscovite differ from Phlogopite mica?

• Muscovite: Higher dielectric strength, stiffer, better electrical insulation. • Phlogopite: Higher thermal stability (up to ~700–800°C), more flexible. Muscovite is preferred for electrical insulation, Phlogopite for extreme heat.

Is Silicone Mica Muscovite flame resistant?

Yes. It exhibits excellent flame resistance and typically meets UL 94 V-0 (grade dependent).

Yes. All silicone mica materials supplied by MISCO Australia are asbestos-free and compliant with modern WHS and environmental requirements.

Does it absorb moisture?

Muscovite mica has very low moisture absorption, ensuring stable dielectric performance in humid conditions.

What compliance and certifications does it meet?

Typical compliance includes: IEC 60371, IEC 60085, IEC 60243, UL 94, UL 1446, RoHS, REACH, and halogen-free/asbestos-free requirements (grade dependent).

Is it available in custom-cut parts?

Yes. MISCO can supply cut-to-size panels, machined components, strips, washers, and formed parts to exact customer specifications.

Is it suitable for switchboards and electrical distribution?

Yes. It is widely used for arc barriers, phase insulation, busbar supports and high-heat electrical shielding.

Can it be bonded to other insulation materials?

Yes. It bonds well with many electrical insulation materials using appropriate high-temperature adhesives or mechanical fastening.

SILICONE MICA MUSCOVITE

Silicone Mica Muscovite is a high-performance electrical and thermal insulation material produced from muscovite mica paper impregnated and bonded with premium silicone resin. This combination provides exceptional stability under continuous high-temperature service, maintaining dielectric strength, mechanical rigidity, and structural integrity where conventional materials fail.

Engineered for demanding industrial environments, the muscovite grade offers superior heat resistance, excellent arc and tracking performance, and reliable dimensional stability under load. It remains non-brittle at elevated temperatures, shows minimal moisture absorption, and withstands rapid thermal cycling without degradation.

SPECIFICATIONS

Product Form

Sheets
Rolls (flexible grades)
Cut-to-size machined parts
Strips and formed pieces
Custom laminated assemblies (on request)

Standard Colours

Natural light grey
Off-white / natural muscovite tone

Sheet Sizes

Standard: 1000 × 600 mm
Optional formats: 1000 × 1200 mm and 1200 × 2400 mm (grade-dependent)
Custom cut sizes available on request

Thickness Range

Typically available from 0.10 mm to 50 mm
Common stocked range: 0.3 mm – 5 mm (flexible) and 5 mm – 50 mm (rigid)
Special thicknesses supplied on request

Compliance

IEC 60371 – Mica-based electrical insulating materials
IEC 60085 – Thermal endurance classification (Class H and higher depending on grade)
IEC 60243 – Electric strength of insulating materials
IEC 60216 – Thermal endurance properties
IEC 60641 / IEC 60893 – Composite electrical insulation requirements (as applicable)
IEC 60695 – Fire hazard testing
EN 45545 (Rail) – Fire protection requirements (grade-specific; available on request)
UL 94 – Flammability rating (typically V-0 for rigid silicone-bonded grades)
UL 1446 – Electrical insulation systems (EIS) compatibility
UL 746E – Polymeric materials – electrical insulating systems components
ASTM D1675 – Mica splitting and reconstituted mica sheets
ASTM D2794 / D229 / D150 – Dielectric and physical property test methods
RoHS – Fully compliant
REACH – SVHC-free
Halogen-Free (grade dependent)
Asbestos-Free – Meets all occupational health and safety requirements
Low Smoke & Toxicity – Suitable for controlled environments (grade-dependent)
ISO 9001 – Manufactured under certified quality systems
ISO 14001 – Environmental management (manufacturer dependent)
ISO 45001 – Occupational health & safety management (manufacturer dependent)
Australian WHS Compliance – Non-hazardous under GHS / Safe Work Australia (finished product)

MECHANICAL PROPERTIES

ELECTRICAL PROPERTIES

THERMAL PROPERTIES

Continuous high-temperature resistance (up to 500–550°C depending on grade)
Excellent dielectric strength and insulation reliability
High arc-resistance and tracking resistance for switchgear environments
Outstanding flame resistance; self-extinguishing behaviour
Strong mechanical integrity at elevated temperatures
Low thermal shrinkage and excellent dimensional stability
Minimal moisture absorption and stable electrical properties in humid conditions
High resistance to oils, greases, solvents, and most industrial chemicals
Superior thermal shock resistance and non-brittle performance under rapid temperature change
Halogen-free, asbestos-free, and compliant with modern environmental standards
Good machinability—suitable for CNC routing, drilling, punching, and forming
Stable performance under mechanical load and vibration
Long service life in continuous high-heat applications
Non-conductive, low thermal conductivity barrier
Good compressive strength at high temperature
Excellent bonding and lamination compatibility with other insulating materials
Consistent thickness accuracy and surface uniformity
Low smoke, low toxicity characteristics (grade dependent)
Resistant to ageing and oxidation

Switch gear & Bus bar Systems – arc chutes, barriers, partitions, phase separators, bus bar supports, thermal shields.
Induction Furnaces & Foundry – coil insulation, interturn barriers, mould and crucible insulation, thermal protection plates.
Motor & Generator Insulation – slot liners, wedges, phase insulation, support plates, and high-temperature end-winding barriers.
Power & Distribution Transformers – spacers, supports, insulation blocks, thermal barriers, and high-heat mechanical components.
Heaters, Ovens & Furnaces – structural insulation boards, heater backing plates, support brackets, and fire-resistant linings.
Rail, Rolling Stock & Tunnels – fire-safe insulating barriers, cable support insulation, and high-temperature enclosures.
Aerospace & Defence – electrical isolation plates, arc shields, thermal barriers for avionics, and high-reliability insulation parts.
Power Generation (Coal, Gas, Hydro, Solar, Wind) – insulators, high-temperature spacers, and support components.
Automotive, EV & Battery Systems – electrical heat shields, high-temperature insulation plates, thermal runaway barriers.
Oil, Gas, Petrochemical & Refining – high temperature gaskets, isolation components, heater insulation panels.
Industrial Machinery & Equipment – CNC machined wear-resistant insulation parts for high thermal loads.
Resistive Heating & Kiln Equipment – insulation blocks, structural panels, thermal backers, coil protection.
Lighting, UV & High-Intensity Equipment – heat-resistant backers, supports, and reflective insulation bases.
Electronics & Semiconductor Equipment – thermal isolation plates, insulating fixtures, high-temperature supports.
Mining & Heavy Industry – electrical isolation plates and high-heat wear-resistant components.
Laboratory & Scientific Instruments – thermal shields and electrical isolation components.
HVAC & Thermal Systems – high-temperature insulation panels in heaters, ducts, and thermal control units.
Marine & Offshore – electrical insulation parts for high-heat machinery and switchboards exposed to harsh environments.

Switchboard Manufacturing & Electrical Distribution - Arc barriers, phase separators, heat shields, mounting plates, and high-temperature insulating components for LV/MV switchboards.
Transformer, Motor & Generator Manufacturing / Rewinds - Slot liners, wedges, coil insulation, spacers, support plates, and high-heat dielectric components for rotating machinery and transformer assemblies.
Induction Furnace, Foundry & Heat-Treatment Equipment - Coil insulation, interturn barriers, furnace shields, support plates, and structural insulation in extreme-temperature environments.
Power Generation – Coal, Gas, Hydro, Solar, Wind & Battery Storage - Thermal barriers, arc-resistant plates, electrical isolation components, and high-heat insulation for turbines, generators, switchyards, and energy-storage systems.
Aerospace, Defence & Military Systems - High-temperature insulation plates, arc shields, electrical isolators, and flame-resistant components for mission-critical equipment.
Rail, Rolling Stock & Tunnel Infrastructure - Fire-safe insulating barriers, cable-route insulation, heat shields, and vibration-resistant components for rail power systems.
Automotive, EV & Heavy Vehicle Manufacturing - Battery insulation plates, high-temperature shields, electrical barriers, and components requiring heat and vibration stability.
Oil, Gas, Petrochemical & Refining - High-temperature gaskets, electrical isolation plates, thermal shields, and arc-resistant components for hazardous industrial environments
Mining, Metals & Heavy Industrial Processing - Electrical isolation plates, thermal shields, and high-heat wear-resistant insulation for harsh, abrasive, and high-load environments.
Electronics, Semiconductor & High-Tech Manufacturing
Thermal isolation plates, dielectric components, insulation for heaters, process chambers, and precision semiconductor equipment.
Industrial Machinery & Automation - CNC machined spacers, shields, control-cabinet insulation, and high-temperature structural insulating components.
Heating, Oven, Kiln & Thermal Processing Equipment - Thermal backers, heater supports, insulating plates, and high-temperature structural components.
HVAC, Heating Elements & Thermal Control Systems - Heat-resistant backing plates, electrical isolation pieces, and insulation components for thermal management equipment.
Marine, Shipbuilding & Offshore Energy - Heat- and corrosion-resistant electrical insulation for switchboards, propulsion systems, and marine power infrastructure.
Construction, Infrastructure & Building Services - High temperature electrical insulation components for commercial and industrial building systems.
Renewable Energy Systems & Inverters - Thermal and electrical insulation for solar inverters, wind turbine control units, battery systems, and power-conversion assemblies.
Data Centres & Critical Infrastructure - Arc resistant insulation for UPS systems, bus bar assemblies, battery banks, and backup-power switchboards.
Laboratories, Scientific Equipment & Test Rigs - High temperature insulation plates, electrical barriers, and thermal isolation components for precision test and research equipment.

Exceptional high-temperature reliability – stable insulation and mechanical strength up to 500–550°C.
Superior dielectric performance – maintains electrical isolation under heat, load and vibration.
Outstanding arc, flame and tracking resistance – ideal for switchgear, busbar, and high-energy electrical systems.
Dimensional stability under heat – very low thermal shrinkage and deformation.
High mechanical strength – resists compression, bending and impact even at elevated temperatures.
Minimal moisture absorption – consistent insulation performance even in humid or variable environmental conditions.
Chemical and contaminant resistance – unaffected by oils, greases, coolants, and most industrial solvents.
Long service life – excellent ageing resistance with minimal degradation over time.
Thermal shock resistance – withstands rapid temperature changes without cracking or delamination.
Low smoke and toxicity characteristics (grade dependent) – suitable for controlled or enclosed environments.
Halogen-free and asbestos-free – safer, modern material compliant with regulatory requirements.
Precision machinability – clean CNC routing, drilling, profiling and punching for complex geometries.
Consistent thickness and density – reliable performance across multiple cut parts or assemblies.
Stable mechanical performance under vibration – suitable for heavy industry, transport and machinery.
Improved safety in electrical faults – non-melting, non-softening behaviour reduces failure risk during thermal events.
Lightweight for its performance class – reduces weight in aerospace, defence, and transport systems.
Compatible with multi-layer insulation systems – bonds well with other electrical insulation materials.
Low thermal conductivity – effective heat barrier in furnace, heater, and power-generation applications.
Versatility across industries – one material suitable for high-heat electrical, mechanical, and structural insulation.

Downloads

All supporting documents for this material are available for download, including the latest technical data sheet, safety data sheet, machining and processing guidance, compliance information, and relevant product brochures.

These controlled documents provide specifications, performance data, handling requirements, and application notes to assist with design, material selection, and fabrication.

Each file is maintained by MISCO Australia to ensure current, reliable information for switchboard, transformer, industrial, and defence grade applications.

Frequently asked questions

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