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Calcined mica tape is built on calcined muscovite mica paper, reinforced on one side with alkali-free glass fibre cloth and bonded with silicone resin. The single-sided glass cloth — widely specified as a glass backed mica tape — carries the tensile load, so the mica layer stays intact at high wrapping speed. After high-temperature baking, drying and slitting, the tape is wrapped between the conductor core and the outer sheath of fire-resistant cables, where it must keep the circuit alive while the fire is still burning.
Compared with phlogopite and synthetic grades, the calcined type is the workhorse for volume cable production: it reaches the same BS 6387 / IEC 60331 fire window at a lower mica cost per metre, which is why it is the most widely ordered R-5461 variant for multi-storey buildings, tunnels and power stations.
Calcination drives off crystal water and volatile matter from the raw muscovite, leaving a thermally stable mica paper that does not blister or delaminate when the fire test ramps to 900 ℃.
The single-sided glass cloth carries the tensile load, so the mica layer stays intact while the tape is pulled around tight conductor cores at high speed. Surface is smooth, flat, dry and non-adhesive.
R-5461-CM-GS is the standard designation for this construction: calcined mica paper, glass on single side.
High-purity muscovite is calcined to remove crystal water, then formed into a continuous paper. The result keeps its dielectric strength at 850–900 ℃ for the full 90-minute fire window.
Glass fibre cloth gives the tape its tensile strength and bending flexibility, so it survives high-speed wrapping around conductor cores without cracking or tearing.
The mica paper and glass cloth are bonded with silicone resin, then baked at high temperature. The bond resists acid and alkali, ages slowly and releases no toxic gas when heated.
The cured web is dried and slit from 4.5 mm up to 1000 mm, then wound on 52 mm, 54 mm, 76 mm or 120 mm cores to match the customer's taping equipment.
Note: R-5461-CM-GS is the standard calcined grade. Other mica paper types and reinforcement combinations (GD, GFD, FS, and phlogopite / synthetic variants) are available under the same R-5461 family — see the Mica Tape in Spool page for the full code list.
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| Item | Unit | 0.10 mm | 0.12 mm | 0.14 mm |
|---|---|---|---|---|
| Appearance | — | No alien material, no split, no scar or hole, no broken fold | ||
| Length | m | 500 / 1000 / 2000 | ||
| Thickness | mm | 0.10 ± 0.015 | 0.12 ± 0.015 | 0.14 ± 0.015 |
| Weight of tape | g/m² | 129 ± 8 | 161 ± 10 | 173 ± 12 |
| Mica content | g/m² | 80 ± 3 | 110 ± 5 | 120 ± 5 |
| Binder content | g/m² | 21 ± 3 | 23 ± 3 | 25 ± 5 |
| Breakdown voltage | kV | >1.2 | >1.6 | >1.8 |
| Tensile strength | N/15 mm | >120 | ||
| Fire grades | ℃ | BS 6387 / 850–900 ℃, IEC 60331 | ||
Standard cores: 52 mm, 54 mm, 76 mm, 120 mm. Custom widths and core sizes can be produced to your drawing.
The R-5461-CM tape holds its insulation at 850–900 ℃ and 600–1000 V for the full 90-minute fire window, keeping emergency circuits live.
Calcined mica paper loses its crystal water before the tape is made, so there is no blistering, delamination or loss of dielectric strength during the fire test.
Excellent acid and alkali resistance with strong ageing resistance. In a dry, room-temperature store the tape keeps its properties for at least one year.
No toxic components in the formulation and no toxic gas released at high temperature — important for tunnels, ships and enclosed public buildings.
Glass cloth reinforcement gives good bending flexibility and high tensile strength when wrapping wire and cable at high line speed.
Smooth, flat, dry and non-adhesive. The tape does not self-stick on the roll and unwinds evenly, so wrapping tension does not drift.
Packaging & storage: supplied in cardboard boxes or wooden boxes. Keep in a dry environment at room temperature; storage period is at least 1 year.
ABoth use mica paper as the base. Calcined mica paper is made from muscovite that has been calcined to remove crystal water, giving a stable and cost-effective base for volume fire-resistant cable production. Phlogopite mica paper is used where a longer or higher-temperature fire window is required. Choose calcined for cost, phlogopite for the most demanding fire tests.
AStandard thicknesses are 0.10 mm, 0.12 mm and 0.14 mm, all with ±0.015 mm tolerance. Slitting width runs from 4.5 mm to 1000 mm. Standard roll lengths are 500 m, 1000 m and 2000 m; for continuous high-speed wrapping, the same tape can be supplied on 50,000 m spools — see Mica Tape in Spool.
ABS 6387 at 850 ℃–900 ℃ and IEC 60331. The tape does not break down for 90 minutes at 850–900 ℃ and 600–1000 V, matching the requirement most often written into fire-resistant cable specifications.
Tell us your thickness, width, roll length and target fire standard. Kaxite will confirm the R-5461-CM-GS specification, lead time and price for your cable 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