Electrical & Thermal Insulation

Our electrical and thermal insulation range covers fibre-reinforced laminates, high-temperature insulation films, thermal interface materials, and EMI/RFI shielding products. We supply sheet, pad, and film forms for machining and die-cutting into insulators, barriers, thermal pads, and shielding gaskets for electronics and power equipment.

Electrical insulation laminates and thermal interface material pads used in electronics and power equipment.

Overview

We stock electrical isolation, thermal transfer, and EMI/RFI shielding materials for switchgear, transformers, motor windings, PCB assemblies, power modules, and electronic enclosures. Thermosetting laminates and electrical pressboard handle structural dielectric duty. High-temperature insulation papers and films extend service ratings from 220°C through to 1400°C for demanding thermal environments. The Class H thermal rating is where most insulation upgrades land — a Class B insulation that has been running hot for years eventually fails, and Nomex or polyimide is the next step. Thermal interface materials (gap pads, phase-change compounds, graphite-enhanced sheets) move heat off PCBs, power modules, and LEDs. EMI/RFI shielding elastomers and foams seal and shield in one part.

Thermosetting Laminates

Fibre-reinforced resin laminates offering high mechanical strength combined with excellent dielectric properties. Available in sheet, rod, and tube forms for machining into structural electrical components.

Epoxy/Glass Fibre Laminate (NEMA/IEC)

The default for structural electrical insulation that has to bolt up under load. Woven glass fabric in epoxy resin matrix. Grades: G10, G10 FR4, G11. Low moisture absorption, high mechanical strength, dielectric performance from cryogenic to 180 °C continuous.

Phenolic/Cotton Fabric Laminate

Woven cotton fabric in phenolic or epoxy resin matrix. NEMA grades CE, LE, G5, G9. Superior impact resistance and machinability for gears, bearings, and structural electrical components.

Phenolic Paper Laminate

Paper-reinforced phenolic laminate with good machinability and electrical properties. Used for terminal boards, insulators, and general-purpose electrical components.

Electrical Pressboard

Cellulose-based sheet and board materials for transformer insulation, winding separation, and general electrical barriers. Cost-effective dielectric solutions with good formability.

Electrical Pressboard (Transformer Grade)

Compressed cellulose pressboard (Presspahn-type) for transformer and motor winding insulation. Good dielectric strength with consistent thickness tolerance for automated winding processes.

Anti-Static Electrical Pressboard

Resistivity-controlled pressboard (Statite-type) that prevents electrostatic charge accumulation. Used in environments where static discharge could damage sensitive components or create ignition risk.

Vulcanised Fibre

Dense cellulose-based laminate with high arc resistance and mechanical strength. Machinable and formable when moistened, suited to washers, slot liners, and fuse components.

High-Temperature Insulation

Films, papers, and fabrics rated for continuous service from 220°C through to 1400°C. These materials provide electrical isolation and thermal barriers in motors, generators, furnaces, and high-temperature process equipment.

Meta-Aramid Paper (Nomex)

When a Class B winding insulation finally cooks, Nomex is what replaces it. Non-woven meta-aramid paper with continuous 220 °C service rating. The standard Class H insulation for motors, generators, and transformers requiring long-term thermal endurance.

Polyimide Film (Kapton)

Amber-coloured polyimide film rated to 400°C+ continuous. Very high dielectric strength in ultra-thin sections for flex circuits, wire wrapping, and high-temperature slot insulation.

Polyester Film

Thin, flexible films with excellent dielectric strength and thermal stability. Used for slot insulation, phase barriers, and flexible circuit insulation in Class B and F applications.

Mica Resin Laminates (Silicone or Phenolic)

Muscovite or phlogopite mica flakes in silicone or phenolic resin matrix. Silicone-bonded grades operate to ~500°C; phenolic-bonded grades cap at ~180°C (Class B per IEC 60085). Excellent arc and track resistance for high-voltage applications.

Ceramic Alumino-Silicate Fibre Paper

Refractory ceramic fibre paper classified to 1260°C (standard) or 1425°C (high-purity); continuous-service ceiling ~1000°C standard / ~1300°C high-purity. Carc. 1B classification under EU CLP — specify AES grades where temperature allows. Lightweight, flexible thermal and electrical insulation for furnace linings, kiln furniture, and exhaust systems.

AES Low-Biopersistent Mineral Wool

Alkaline earth silicate mineral wool board/sheet. Continuous service to 1000°C+ with improved health and safety profile over traditional ceramic fibre products.

Silicone-Coated Glass Fibre Cloth

Woven glass fibre cloth coated with silicone elastomer for flexible high-temperature thermal barrier. Combines electrical insulation with heat shielding in cable wrapping and expansion joint applications.

Calcium Silicate Board

Rigid calcium silicate insulation board for high-temperature thermal barriers. Continuous service to 1000 °C+ with good compressive strength for load-bearing insulation in furnaces, kilns, and industrial ovens.

Thermal Interface Materials

Thermally conductive pads, films, and compounds designed to minimise thermal resistance between heat-generating components and heatsinks. Used extensively in power electronics, LED assemblies, and PCB thermal management.

Silicone Thermal Gap Pad

When a power component needs to dump heat to a chassis that does not sit perfectly flat, the gap pad fills the space. Conformable silicone elastomer pads with 1.0–6.0 W/mK thermal conductivity. Bergquist Gap Pad, Laird T-Flex, and equivalent products available.

Phase-Change TIM

Solid at room temperature, transitions to low-viscosity liquid at operating temperature. 3.0+ W/mK conductivity with minimal bond-line thickness for high-performance processor and power module cooling.

Electrically Isolating Thermal Pad

Thermally conductive pad providing simultaneous electrical isolation (>10 kV). Bergquist Silpad series and equivalents for TO-220, TO-247, and power module mounting where dielectric withstand is critical.

Graphite-Enhanced TIM Pad

Graphite-filled silicone pads providing 3.0–6.5 W/mK thermal conductivity. Parker Chomerics T-Flex series and equivalents for high-power applications requiring superior thermal performance.

Speciality TIM Compound Sheets

Wide range of thermal interface sheets using silicone, non-silicone, or speciality chemistries. Includes low-outgassing, high-temperature, and reworkable formulations for application-specific thermal management.

EMI / RFI Shielding

Electrically conductive elastomers, foams, and absorber sheets that provide electromagnetic interference shielding combined with environmental sealing. Essential for electronic enclosures requiring regulatory EMC compliance.

Electrically Conductive Elastomer Sheet

Silicone or fluorosilicone filled with conductive particles for combined sealing and EMI/RFI shielding. Die-cut into gaskets for enclosure flanges, access panels, and connector interfaces.

Electrically Conductive Foam Sheet

Open-cell foam impregnated with conductive particles for EMI shielding gasket applications. Lightweight, low closure force, and suited to internal compartment shielding and board-level isolation.

Ferrite Sheet (Noise Absorber)

Flexible ferrimagnetic sheet that absorbs RF noise energy. Used as NFC/RFID antenna backing, cable noise suppression, and resonance damping in high-frequency electronic assemblies.

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Disclaimer

This resource is provided for general engineering reference only and does not constitute professional advice, specification, or guarantee of performance. Actual results depend on specific application conditions. Universal Gaskets Pty Ltd accepts no responsibility or liability for decisions made based on this information. For full terms, see our Terms & Conditions.