Three steps — from raw mineral to precision-cut high-temperature gasket
A mica gasket is a precision-cut flat seal made from natural mica sheet, used where service temperature or electrical insulation demands exceed what conventional gasket materials can deliver. Because mica is a mineral with a layered crystalline structure, mica gaskets combine high compressive strength with thermal stability, dielectric strength (15-25 kV/mm), and near-zero moisture absorption. They do not cold-flow under load, do not age, and are chemically inert to most acids, alkalis and solvents.
As an experienced mica gasket manufacturer in China, Kaxite Sealing cuts gaskets from both Muscovite (up to 500°C) and Phlogopite (up to 900°C) sheet to your exact drawing. Related mica products: Mica Sheets, Mica Tapes and Mica Tubes.
Choose by flange design and sealing method
The classic RTJ-style ring that sits inside the bolt circle. Standard for high-pressure flanges.
Covers the entire flange face including bolt holes. Better sealing for low-pressure or irregular flanges.
Oval, rectangular or fully custom geometry cut to your drawing or CAD file at no extra tooling cost.
How mica gaskets compare against other high-temperature sealing materials
Where graphite gaskets oxidize and non-asbestos gaskets decompose, mica gaskets maintain their structural integrity and sealing force. This is why mica is preferred for exhaust systems, turbine housings and industrial burners.
| Property | Mica Gasket | Graphite Gasket | Non-Asbestos |
|---|---|---|---|
| Max Temperature | 900°C | 450°C (oxidizing) | ~250°C |
| Dielectric Strength | 15 – 25 kV/mm | Conductive | Low |
| Chemical Resistance | Universal | Universal (non-oxidizing) | Depends on binder |
| Cold Flow | None | Moderate | Moderate |
| Water Absorption | < 0.1% | Moderate | High |
| Best For | Automotive exhaust · Turbines | Steam · Non-oxidizing service | General industrial |
Custom sizes and thicknesses available on request. Review our Our Quality page for full tolerance specifications, or send us your inquiry for a fast quotation.
Where mica gaskets outperform every other flat sealing material
Manifold & turbo flanges
Combustor & exhaust section seals
High-temp channel & cover gaskets
Furnace & kiln burner flanges
High-voltage insulation barriers
Coke oven & blast furnace seals
Engine & thermal protection seals
Furnace peep-hole & flange seals
Choose mica when service temperature exceeds 450°C in air (graphite oxidizes above this) or when high-voltage electrical insulation is required (graphite is conductive). Mica is preferred for exhaust manifolds, gas turbine housings and industrial burner flanges. See Mica Sheets for the raw material.
Muscovite mica gaskets work up to 500°C and offer the best dielectric strength — ideal for electrical insulation and moderate-temperature sealing. Phlogopite mica gaskets work up to 900°C and are preferred for automotive exhaust, turbines and industrial furnaces. Contact us with your service conditions for a recommendation.
A ring gasket sits inside the bolt circle — used for high-pressure or raised-face flanges. A full-face gasket covers the entire flange face including bolt holes — used for low-pressure or flat-face flanges where the bolts themselves need sealing. Send us your flange drawing and we will recommend the right shape.
Yes. We CNC-cut or die-cut mica gaskets to any shape or size — ring, full-face, oval, rectangular or complex CAD geometry — with tolerance ±0.2 mm. Please send your inquiry with a drawing or dimensions for a fast quotation. No extra tooling charge for standard thickness materials.
Yes. Every shipment includes Mill Test Certificate, dimensional inspection record and material composition report. RoHS and REACH documentation are available on request. See our Our Certificate page.
MOQ is 10 pcs for standard sizes. Lead time is 7-15 days after order confirmation. Payment terms are T/T or L/C. Free samples are available — you only cover the courier cost. Contact Us to discuss.
Ring, full-face, oval or complex CAD geometry — we CNC-cut mica gaskets to your exact specification. No extra tooling charge for standard thicknesses.
Get Custom QuoteVerify material, thickness and cut tolerance against your own spec before placing a bulk order. Both Muscovite and Phlogopite samples available.
Contact Us NowMica gasket is a high-temperature, chemically-resistant sealing material made from high-grade phlogopite mica paper (an aluminosilicate of mineral origin) impregnated with a silicone binder. The phlogopite mineral gives the gasket its thermal characteristics and its outstanding resistance to solvents, acids and mineral oils, making it the preferred sealing material in automotive exhaust systems, gas turbines, heat exchangers and industrial burners. Kaxite supplies mica gasket as sheets (thickness 0.1–3.0 mm, width 1000 mm, length up to 2400 mm), as rolls (thickness 0.1–0.25 mm, width 500 or 1000 mm, length up to 300 m) and as custom strips or punched gaskets to drawing.
