Rigid Mica Laminate

General Details
Ruby Mica® Rigid Mica Laminate is made by combining uncalcined muscovite or phlogopite mica-paper with an inorganic silicone-resin binder under specific heat and pressure.

It has excellent rigidity, heat-resistance, moisture-resistance and di-electric properties. It is a completely asbestos-free and highly chemical-resistant insulation having low thermal-conductivity. It does not emit smoke or odor upon heating up. Since the binder plays a critical role in the overall product performance, the best commercially-available resin, with as much as 82% solid silicone content, is imported from Germany for excellent results.

Muscovite mica paper-based material can withstand temperatures up to 600°C whereas, phlogopite mica paper-
based material can withstand high temperatures up to 800°C. The product is IEC 60371-3-3 compliant.

A choice of epoxy resin is also available as a binder. Ruby Mica® Epoxy Rigid Mica Laminates have higher rigidity, highly-uniform surface profile and weatherproof properties when fully cured. However, the working temperature is limited to 250°C – 300°C. They are mainly used for commutator-segment insulation.


Heating-element supports, winding-cards and cover-plate insulation in domestic appliances and industrial-heating elements. Its superior chemical-resistance makes it an ideal battery-cell separator. Highly temperature-resistant mica machined parts for complete Ferro alloys submerged arc furnace and induction furnace insulation. Dynamic breaking resistors in railways and plate-insulation in heated presses.

Thermocouples and conductor insulation.


Standard Sheet
Length : 1000 mm
Width : 600/1000/1200 mm
Thickness : 0.1 to 75 mm
(Sheets can be sheared to customized sizes)

Standard Tubes
Length : 10 -1000 mm
ID : 6 – 200 mm
(Tubes can be rolled to customized sizes)
Machined Mica Parts

Rigid Mica Washers and Laminates can be custom machined to desired component drawings at our facilities.


Sheets/tubes/mica machined parts are packed in airtight robust wooden boxes protecting them from dirt, dust and moisture. The packaging also ensures safe transit and storage.


12 months at ≤25°C

Techical Info
Mica % 90
Silicone % 10
Density g/cm³ 2.3 ± 0.1
Tensile strength MPa > 150
Flexural strength MPa > 230
Compressive strength MPa > 400
Dielectric strength kv/mm > 25
Operating temperature °C 500 – 600 (M)
700 – 800 (P)
Weight loss % < 0.5
Water absorption % < 0.2

Data is based on test performed by Ruby Mica Co. Users are advised to verify and ensure suitability for intended applications. The above product can be tailored according to your desired specifications.

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