Mica Gaskets and Seals
High-Thermal Resistance
PRODUCTS > MICA GASKETS AND SEALS
WHAT IS A MICA GASKET?
A mica gasket is a high-temperature and chemically resistant sealant made from mica sheets, used in industrial applications to prevent leaks and provide insulation between stationary components.
Axim Mica’s AX-GASKET line is lightweight and provides high thermal resistance for demanding industrial environments where conventional sealing materials may not meet application requirements. It combines flexibility with durability and is suitable for high-pressure environments and complex gasket shapes.
Available in muscovite and phlogopite mica, AX-GASKET can be specified for applications requiring thermal resistance, electrical insulation, and resistance to solvents, acids, and mineral oils.
MICA: A HIGH-TEMPERATURE GASKET MATERIAL FOR EXTREME SERVICE
A high temperature gasket material must maintain the thermal, mechanical, and sealing properties required by the application as operating temperatures increase. Material selection also depends on pressure, chemical exposure, electrical insulation requirements, gasket thickness, and the surfaces being sealed. For applications exposed to sustained or extreme heat, these requirements can limit the suitability of conventional gasket materials.
Rubber, elastomer, and fibre-based gasket materials can lose mechanical or sealing performance when operating temperatures exceed their specified limits. The exact temperature capability depends on the material and construction, so gasket selection should be based on the requirements of the specific system rather than temperature alone. This becomes especially important when the gasket must provide electrical insulation in addition to sealing under heat and pressure.
Mica provides another option for these demanding applications. Axim Mica’s AX-GASKET is manufactured from mica with a silicone binder and offers thermal resistance up to 1800°F, along with electrical insulation, flexibility, and suitability for high-pressure environments. It also resists solvents, acids, and mineral oils. These properties make mica gasket material useful where sealing performance must be combined with thermal and electrical insulation.
AX-GASKET is available as high-temperature gasket sheet material that can be fabricated into application-specific seals, strips, and punched parts. For engineers and procurement teams evaluating a high-temperature gasket material, mica is particularly relevant when the application requires a combination of heat resistance, dielectric performance, chemical resistance, and dimensional flexibility.
APPLICATIONS
Our Ax-Gaskets can be used in a variety of applications, including:
High-Voltage Cabins
Acts as a mechanical support and electrical insulator.
Forging Machines & Hydraulic Presses
Replacement for asbestos panels.
Automotive
Used in exhaust manifolds.
Mica gaskets and seals are also used across several industry groups:
POWER AND ENERGY
Filler for spiral wound gaskets, fuel cells, gas turbines, and turbo generators.
AUTOMOTIVE
Exhaust manifolds and cam profile gaskets.
HEAVY INDUSTRY
Iron and steel works, chemical processing, glass manufacturing, and petrochemical processing.
ELECTRONICS
Support for heating resistors, thermal insulation in circuit breakers, and insulation between electronic components.
AX-GASKET can also serve as a thermal insulator in high-mechanical-stress environments, including iron and steel works, chemical processing, glass manufacturing, and petrochemical processing.
PROPERTIES & COMPOSITION
The table below summarizes AX-GASKET material specifications for sheet and roll stock.
Sheets
| Property | Specification |
|---|---|
| Thickness | 0.1mm – 3.0mm (custom thicknesses available) |
| Width | 1000mm |
| Maximum length | 2400mm |
| Thermal resistance | Up to 1800°F (982°C) |
| Chemical resistance | Resists solvents, acids, and mineral oils |
| Composition | Muscovite or phlogopite mica paper impregnated with a silicone binder |
Rolls
| Property | Specification |
|---|---|
| Thickness | 0.1mm – 0.25mm |
| Width | 500mm or 1000mm |
| Maximum length | 300mm |
| Thermal resistance | Up to 1800°F (982°C) |
| Chemical resistance | Resists solvents, acids, and mineral oils |
| Composition | Muscovite or phlogopite mica paper impregnated with a silicone binder |
ASBESTOS PANEL REPLACEMENT
Mica gaskets and panels can be used as a replacement for asbestos-based sealing and insulating materials in forging machines, hydraulic presses, and other industrial equipment where the required thermal, electrical, chemical, and mechanical properties are compatible with mica. Material selection should be based on the specific operating requirements of the application rather than treated as a universal one-for-one substitution.
Axim Mica’s AX-GASKET provides thermal resistance up to 1800°F (982°C), electrical insulation, and resistance to solvents, acids, and mineral oils. These properties make mica suitable for applications where asbestos-based panels or gaskets were historically used for high-temperature insulation and sealing. The required thickness, dimensions, pressure conditions, and installation configuration should be evaluated before replacing an existing material.
HOW AX-GASKETS ARE MADE
- Mica Paper Creation: Axim sources high grade Phlogopite mica, which gives the gaskets its thermal characteristics and resistance to harsh chemicals.
- Impregnation: The mica paper is then impregnated with a silicone binder to enhance durability and flexibility.
- Cutting & Shaping: After impregnation, the material is cut and shaped into seals and gaskets, designed to withstand extreme conditions.
CUSTOM SHAPES, PUNCHED PARTS AND STRIPS
Beyond standard sheets and rolls, Axim Mica produces custom gasket shapes, punched parts, and cut strips to match specific equipment and design requirements. Components can be sized and profiled for existing assemblies or new designs using available AX-GASKET material formats.
Axim Mica accepts PDF and CAD files as well as hand-sketched drawings for custom fabrication. Contact Axim Mica with your dimensions, material requirements, and drawings to discuss a custom part.
ENGINEERING EXCELLENCE WITH AXIM MICA
Ready to move forward? Our engineering team collaborates with clients to develop application-specific solutions, helping align each component with the required specifications and performance requirements.
FAQs
The following answers cover mica gasket composition, high-temperature performance, common applications, and what to consider when ordering custom parts.
Mica gaskets are sealing and insulating components made from mica material for applications involving high temperatures, electrical insulation, chemical exposure, or pressure. Axim Mica’s AX-GASKET is available in muscovite and phlogopite mica with a silicone binder and provides thermal resistance up to 1,800°F (982°C).
Unlike graphite, mica provides electrical insulation, while its temperature capability can also exceed that of many conventional rubber, elastomer, and compressed fibre gasket materials. AX-GASKET also resists solvents, acids, and mineral oils and can be fabricated into custom shapes, strips, and punched parts.
Axim Mica’s AX-GASKET provides thermal resistance up to 1,800°F (982°C). In addition to high-temperature capability, it provides electrical insulation, resistance to solvents, acids, and mineral oils, and flexibility for complex shapes. AX-GASKET is also suitable for high-pressure environments, supporting applications where thermal, electrical, chemical, and mechanical requirements overlap.
Mica gaskets are used in high-voltage cabins as mechanical supports and electrical insulators, in forging machines and hydraulic presses as asbestos panel replacements, and in automotive exhaust manifolds. They are also used in power and energy, heavy industry, and electronics applications where thermal resistance, electrical insulation, or chemical resistance is required.
Finished AX-GASKET components are available in thicknesses from 1mm to 3.0mm, with custom thicknesses available based on application requirements. AX-GASKET sheet stock is available from 0.1mm to 3.0mm, while roll stock is available from 0.1mm to 0.25mm.
Yes. Axim Mica produces custom gasket shapes, punched parts, and cut strips based on your specifications. PDF and CAD files, as well as hand-sketched drawings, can be used to quote and produce custom parts.
Lead time depends on the gasket shape, thickness, quantity, and fabrication requirements. Contact our engineering team with your specifications for a project-specific lead time.
Mica and graphite gaskets differ most clearly in their electrical properties and temperature behavior. Axim Mica’s AX-GASKET provides electrical insulation and thermal resistance up to 1,800°F (982°C), while graphite is electrically conductive and has a continuous temperature capability up to 850°F (454°C) in oxidizing air. Graphite can withstand much higher temperatures in inert environments, so the right material depends on the operating atmosphere, temperature, pressure, chemical exposure, and electrical insulation requirements.
Yes, mica gaskets and panels can be used as a replacement for asbestos-based materials in forging machines, hydraulic presses, and similar equipment where mica’s thermal, electrical, chemical, and mechanical properties meet the application requirements. The replacement should be evaluated for the specific thickness, dimensions, pressure conditions, and installation configuration rather than treated as a universal one-for-one substitution.
To quote a custom gasket, Axim Mica needs the part dimensions, thickness, quantity, and applicable material or performance requirements. A PDF, CAD file, or hand-sketched drawing can also be provided to help define the required shape and dimensions.
Mica Gaskets FAQ
In the unforgiving world of extreme industrial environments, where heat scorches and electricity hums with dangerous energy, conventional sealing solutions simply falter. Imagine a furnace operating at a blistering 1,500°F, or an induction heater where precise electrical insulation is not just a preference but also a critical safety mandate. This is where Mica gaskets emerge as the unsung heroes of high-performance sealing. Often overlooked, these resilient components are far more than just simple seals—they are engineered barriers that protect vital machinery, ensure operational efficiency, and, most importantly, safeguard personnel. Their unique properties allow them to thrive where other materials crumble, offering exceptional thermal stability, electrical insulation, and chemical inertness. From power generation to petrochemical processing, Mica gaskets are the silent guardians maintaining system integrity under duress. But what exactly makes them so special, and how do you harness their power effectively? This comprehensive guide will demystify Mica gaskets, exploring their science, applications, and how to select, install, and maintain them for optimal performance. Dive in to uncover why these remarkable materials are indispensable in your most demanding operations.
Mica gaskets are seals made from natural mineral sheets, specifically chosen for their unparalleled resistance to extreme heat, high dielectric strength, and chemical inertness, which sets them apart from conventional elastomers or fibrous gaskets. Unlike rubber or soft materials, Mica maintains structural integrity and sealing properties at temperatures up to 1,800°F (982°C) without significant degradation or compression set. They are composed of phlogopite or muscovite Mica, often bonded with a small amount of inorganic binder or reinforced with metal. This makes them specifically suited for applications where other materials would melt, burn, or become electrically conductive.
Takeaway: Choose Mica gaskets for applications that demand robust sealing under extreme thermal and electrical stress.
Mica’s primary unique properties for extreme environments include exceptional thermal stability, which allows it to withstand temperatures up to 1,800°F, and superior electrical insulating capabilities. It also boasts remarkable chemical inertness, resisting most acids, alkalis, and oils, which ensures performance in corrosive settings. Furthermore, Mica exhibits excellent compressive strength and low compression set, which means that it retains its thickness and sealing force even under high loads and thermal cycling. These combined characteristics prevent material degradation and system failure in conditions where other materials would quickly break down.
Takeaway: Leverage Mica’s triple threat—heat, electrical, and chemical resistance—for reliable extreme environment sealing.
Mica gaskets are most commonly applied in industrial settings that require high-temperature sealing or electrical insulation, such as in industrial furnaces, ovens, and kilns, where operating temperatures can exceed 1,000°F. They are vital in induction heaters, power generation equipment, and electrical insulation components due to their high dielectric strength. Additionally, their chemical resistance makes them suitable for sealing in some petrochemical and chemical processing equipment where aggressive substances are present. Their versatility extends to boiler applications, exhaust systems, and specialized aerospace components.
Takeaway: Deploy mica gaskets in any industrial application that presents a combination of high heat, electrical insulation needs, or chemical exposure.
Yes, the two primary types of Mica used in gaskets are Muscovite and Phlogopite Mica, which are differentiated mainly by their maximum operating temperature and electrical properties. Muscovite Mica, derived from potassium aluminum silicate, offers superior dielectric strength and is suitable for temperatures up to 1,200°F (650°C), which makes it ideal for electrical insulation. Phlogopite Mica, a potassium magnesium aluminum silicate, can withstand even higher temperatures, up to 1,800°F (982°C), but has slightly lower electrical resistivity. Additionally, reinforced Mica gaskets combine Mica with other materials like stainless steel or fiberglass for enhanced mechanical strength and sealing integrity in specific high-pressure applications.
Takeaway: Match the Mica type (Muscovite for electrical; Phlogopite for extreme heat) to your application’s specific thermal and electrical needs.
Mica gaskets contribute to energy efficiency by maintaining tight seals in high-temperature systems, preventing heat loss, and ensuring that process energy is contained and utilized effectively rather than escaping. From an operational safety perspective, their robust electrical insulation prevents short circuits and current leakage in electrical heating elements and machinery. By preventing leaks of hot gases or fluids and insulating electrical components, they mitigate the risks of equipment damage, fires, and potential harm to personnel. This dual benefit ensures both economic savings and a safer working environment.
Takeaway: View Mica gaskets as essential investments that simultaneously boost energy efficiency and enhance workplace safety.
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