Hard Mica Sheet
Model:KXT B502
Hard Mica Sheet from natural mica, thickness 0.075–0.15 mm (0.003"–0.006"), service temperature up to approx. +1000 °F (+540 °C). High dielectric strength, thermal resistance and transparency. Available in rectangular, oval and circular shapes, any size and any quantity. Used for sight-glass, electrical insulation, mica washers and gaskets, and heater elements. Material certificate supplied. Factory-direct price, 7–15 day lead time.
Hard Mica Sheet — Rigid Mica Insulating Sheet up to +1000 °F for Electrical, Thermal & Sight-Glass Applications
Hard Mica Sheet — a rigid mica insulating sheet with high dielectric strength, high thermal resistance and full optical clarity.
Hard Mica Sheet is a rigid mica insulating material produced from natural mica, formed into flat sheets with excellent electrical, thermal and mechanical properties. It withstands continuous service up to approximately 1000 °F (+540 °C), is dimensionally stable at high temperature, and provides reliable dielectric strength for electrical insulation and thermal barriers. The same mica is used as transparent sight-glass for kerosene stoves, wood stoves, furnace peep-holes and microwave ovens, and can be cut into washers, gaskets and heater elements to drawing.
- Material: natural mica, rigid sheet form
- Standard thickness: 0.075 mm – 0.15 mm (0.003" – 0.006")
- Service temperature: up to approx. +1000 °F (+540 °C)
- Key properties: high dielectric strength, high thermal resistance, transparency, non-breakability, dimensional stability
- Shapes: rectangular, oval, circular, cut to any specified size and thickness
- Applications: electrical insulation, mica washers, mica gaskets, heater manufacturing, sight-glass windows
- Documentation: material certificate and dimensional inspection report supplied with each batch
What Is a Hard Mica Sheet?
Hard Mica Sheet is a rigid insulating sheet made from natural mica. Mica has an excellent combination of electrical, physical, mechanical and thermal properties: high dielectric strength, very low thermal conductivity, high transparency and optical clarity, flatness, non-breakability, and heat resistance. Because these properties remain stable over a very wide temperature range, mica has long been a preferred insulation material for high-temperature electrical and thermal applications.
Hard mica sheet is used where a rigid, dimensionally stable insulating barrier is required — for example, as electrical insulation in heaters and appliances, as high-temperature washers and gaskets, and as transparent sight-glass in kerosene stoves, wood stoves, furnace peep-holes and microwave ovens. It eliminates the risk of cracks, breakage and jerks, withstands shocks, strains and vibration at high temperature, and retains its basic strength over the service life of the equipment. Sheets can be supplied in rectangular, oval or circular shapes, in any specified size and thickness, and can be cut, punched or die-cut to drawing.
Standard Mica Sheet Sizes
| Width (in) | Length (in) | Common Applications |
|---|---|---|
| 2" | 2" / 3" / 4" / 5" / 6" | Small sight-glass, electrical insulation |
| 3" | 3" / 4" / 5" / 6" / 7" | Sight-glass, washers, small gaskets |
| 4" | 4" / 5" / 6" / 7" / 8" | Stove windows, electrical insulation |
| 5" | 5" / 6" / 7" / 8" | Furnace peep-holes, heater insulation |
| 6" | 6" / 7" / 8" | Oven windows, appliance insulation |
| 8" | 8" / 9" / 10" / 12" / 15" | Large sight-glass, industrial insulation |
The above sizes are not the complete range. Any size can be supplied in any quantity. Custom thickness, shape and die-cut parts available on request.
Key Properties
| Property | Value / Description |
|---|---|
| Material | Natural mica, rigid sheet |
| Standard thickness | 0.075 mm – 0.15 mm (0.003" – 0.006") |
| Service temperature | Up to approx. +1000 °F (+540 °C) |
| Dielectric strength | High — suitable for electrical insulation |
| Thermal conductivity | Low — acts as thermal barrier |
| Transparency | High optical clarity, suitable for sight-glass |
| Mechanical | Non-breakable, retains strength at high temperature, withstands shock and vibration |
| Chemical | Inert, moisture-resistant, dimensionally stable |
Typical Applications
- Sight-glass windows in kerosene stoves, wood stoves, furnace peep-holes and microwave ovens
- Electrical insulation in heaters, appliances and electromechanical assemblies
- High-temperature mica washers and mica gaskets
- Heater element manufacturing and thermal barrier components
- Thermal and electrical insulation in industrial furnaces and process equipment
- Insulating barriers in high-temperature electrical equipment
- Custom die-cut mica parts to drawing
Why Buy Hard Mica Sheet from Kaxite Sealing
We source and process the mica in-house
Ningbo Kaxite Sealing Materials Co., Ltd. operates its own mica processing, forming and cutting facility in Ningbo, China. We control mica grade, sheet thickness, surface flatness and edge finish — so the sheet you receive is consistent from batch to batch and ready for your application.
Quality control on every batch
- Incoming natural mica verified for grade and purity
- Sheet thickness measured on 100% of production
- Surface flatness and transparency inspected
- Dielectric strength spot-tested on each batch
- Material certificate and dimensional report supplied with each shipment
- Third-party inspection (SGS, BV, TUV) arranged on request
Custom sizes and die-cut parts
- Standard thickness 0.075 mm – 0.15 mm; custom thickness on request
- Rectangular, oval and circular shapes; any size in any quantity
- Die-cut washers, gaskets, sight-glass discs and custom shapes to drawing
- Mica sheet paper and soft mica sheet available from the same production line
Terms that suit project procurement
- No minimum order quantity on standard sizes — sample and trial orders welcome
- Stock sizes ship in 7–15 days; custom cutting and die-cutting in 15–25 days
- Export packing with protective wrap and plywood case or pallet
- 24 hours × 7 days after-sales response
What to Send for an Accurate Quotation
| Information | Example | Why We Need It |
|---|---|---|
| Shape | Rectangular, circular, oval | Determines cutting or die-cutting setup |
| Dimensions | 100 mm × 150 mm, or Ø80 mm | Cutting layout and yield |
| Thickness | 0.10 mm | Confirms sheet stock selection |
| Quantity | 500 pcs | Sets production scheduling |
| Application | Sight-glass, electrical insulation | Confirms grade and finish |
| Drawing (if applicable) | PDF or DXF | Confirms tooling and finished part price |
Get Your Hard Mica Sheet Quotation
Send your required shape, dimensions, thickness and quantity. Our technical sales team will reply within 2 business hours with a factory price and available stock sizes.
Frequently Asked Questions
What is the maximum service temperature of hard mica sheet?
Hard mica sheet withstands continuous service up to approximately +1000 °F (+540 °C). Because mica is an inorganic mineral, it does not burn, melt or lose its dielectric properties at high temperature, which makes it a preferred insulation material for heaters, furnaces and high-temperature sight-glass.
What is the difference between hard mica sheet and soft mica sheet?
Hard mica sheet is rigid and dimensionally stable, and is used where a self-supporting insulating barrier is required — such as sight-glass windows, washers and electrical insulating plates. Soft mica sheet is flexible and conformable, and is used where the sheet must follow a curved surface or be wrapped. Both are produced from natural mica; the difference is in the binder and forming process.
What thicknesses are available?
Standard thickness is 0.075 mm to 0.15 mm (0.003" to 0.006"). Custom thicknesses are available on request. For thicker rigid insulation, multiple sheets can be laminated or a thicker mica plate can be supplied. Confirm the required thickness against your application with our technical team.
Can hard mica sheet be cut or punched to my drawing?
Yes. We cut, punch and die-cut hard mica sheet into rectangles, circles, ovals, rings, washers, sight-glass discs and custom shapes to your drawing. Send your drawing in PDF or DXF and we will confirm tooling and lead time.
What are your MOQ, lead time and payment terms?
There is no minimum order quantity on standard sizes — sample and trial orders are welcome. Stock sizes ship in 7–15 days; custom cutting and die-cutting take 15–25 days. Standard payment terms are 30% T/T deposit with the balance against copy of B/L, or L/C at sight for larger orders.
Do you supply material certificates?
Yes. Every batch is supplied with a material certificate covering mica grade, thickness, dielectric strength and service temperature, plus a dimensional inspection report. Third-party inspection can be arranged on request.
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Contact Info
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Address
No. 432 Zhenhai Middle Road, Luotuo Street, Zhenhai District, Ningbo City, Zhejiang China
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