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Calcined muscovite mica paper (type 502-1) is a continuous roll made from calcined muscovite mica by pulp making, paper copying, slitting and rewinding. During calcination, crystal water and volatile matter are driven off before the paper is formed, so the finished sheet does not blister or delaminate when the fire test ramps to 850 ℃.
Compared with natural muscovite paper, the calcined grade uses mica flakes of uniform size and delivers better overall performance — a stable dielectric layer that holds up in resin-rich and fire-resistant mica tape production.
Muscovite · commutator insulation with traces of bond
High mechanical strength for mica sheets, tubes and laminates
Heat resistance 750–850 ℃ for mica tape and mica roll
Heat resistance up to 1000 ℃ for fire-resistant mica tape
Muscovite with good permeability for less resin mica tape
Uniform flakes for fire-resistant and resin-rich mica tape
Type 502-1 is the calcined grade on this page. The 505 / 506 / P506 / S506 / 507 codes are the other five mica paper types produced from the same paper-making line; request the full data sheet for comparisons across all six grades.
| Item | Unit | 60 g/m² | 120 g/m² | 160 g/m² |
|---|---|---|---|---|
| Mass per unit area | g/m² | 60 | 120 | 160 |
| Tolerance of mean | % (≤) | ±3 | ±3 | ±3 |
| Tolerance | % (≤) | ±6 | ±7 | ±7 |
| Average thickness | μm | 40 | 80 | 100 |
| Penetration time | s (≤) | 25 | 65 | 90 |
| Dielectric strength | kV/mm | 22 | 22 | 22 |
| Tensile strength | N/cm (≥) | 3.2 | 4 | 6 |
| Heat loss | % | 0.5 | 0.5 | 0.5 |
| Conductivity of water extract | μs/cm (≤) | 15 | 15 | 15 |
| Heat resistance | ℃ (≥) | 850 | ||
All values are for type 502-1 calcined muscovite mica paper. Three standard mass grades are supplied: 60, 120 and 160 g/m². Custom mass grades are produced to drawing by mutual agreement.
Calcination removes crystal water before paper forming, so the sheet reaches a 850 ℃ heat resistance rating and holds its dielectric layer without blistering or delamination at the fire test temperature.
A stable dielectric strength of 22 kV/mm across all three mass grades. The uniform mica flake distribution delivers a consistent barrier layer for the downstream tape.
Excellent acid, alkali, moisture and ageing resistance. The paper does not swell or lose mechanical strength under long-term exposure to humidity and temperature cycling.
Tensile strength runs from 3.2 N/cm at 60 g/m² up to 6 N/cm at 160 g/m² — enough to survive high-speed paper copying, silicone resin bonding and downstream slitting.
Controlled penetration time (25 s / 65 s / 90 s by grade) lets silicone resin soak through evenly during bonding, which is critical for resin-rich mica tape constructions.
Calcined flakes are screened to a uniform size, giving the paper a more consistent basis weight and better overall performance than natural muscovite paper of the same mass grade.
Calcined muscovite flakes are suspended, screened and formed into a continuous paper on the paper-making line. Mass grade (60 / 120 / 160 g/m²) is set at this stage.
The formed paper is slit to customer width and rewound into rolls. Roll length and core size are set here to match downstream equipment.
Mica paper is used as the base material and reinforced with glass fibre cloth, film or other reinforcing materials through silicone resin bonding.
The bonded web is baked and dried at high temperature, then slit into finished mica rolls and mica insulation materials.
Both use muscovite mica as the base mineral. Calcined muscovite is calcined before the paper is formed, driving off crystal water and volatile matter. The result is a paper with more uniform flake size, better basis weight consistency and better overall performance than natural muscovite paper — which is why calcined 502-1 is preferred for fire-resistant and resin-rich mica tape. See the Muscovite Mica Paper page for the natural grade.
Three standard mass grades are supplied: 60 g/m², 120 g/m² and 160 g/m². Lower mass (60 g/m²) suits thin-wall tape constructions that need a fast penetration time (25 s); higher mass (160 g/m²) suits heavier fire barriers that need higher tensile strength (6 N/cm). Dielectric strength is 22 kV/mm across all three grades.
850 ℃ minimum, measured per the heat resistance parameter in the specification table above. This is higher than natural muscovite paper and matches the calcined mica tape grade used in fire-resistant cable production.
Yes. Type 502-1 is used as the base material in fire-resistant mica tape and resin-rich mica tape production. The paper is bonded with silicone resin and reinforced with glass fibre cloth or film, then high-temperature baked, dried and slit into finished mica rolls. See Calcined Mica Tape for the finished product.
Tell us the mass grade (60 / 120 / 160 g/m²), roll width, roll length and core size. Kaxite will confirm the type 502-1 specification, lead time and price for your mica tape or mica roll production line.
Address
No 432 Zhenhai Middle Road, Luotuo Street, Zhenhai District, Ningbo City, Zhejiang China
0086-574-87527773
No 432 Zhenhai Middle Road, Luotuo Street, Zhenhai District, Ningbo City, Zhejiang China