Silicone Mica Sheet Manufacturer in India
Where the rigid mica insulation board lacks is the flexibility factor that comes with a silicone mica sheet. The reason for the flexibility offered by the latter but not the former is that whereas a rigid mica board uses rigid thermoset resins as the binding agent, the former combines high purity mica paper with silicone resin.
At Harnawa Inc., a specialized silicone bonded mica sheet manufacturer in India, we manufacture this high temperature flexible insulation material and distribute it throughout India to manufacturers of motors, heating systems, and other industries. As an Electrical Insulation Material Manufacturer in India, we also enjoy international certifications and pan-India supply from our factory located in Mumbai.
What Makes Silicone Mica Sheet Different?
Key among the features of this material is its resin system. Normal rigid mica sheets usually contain epoxy or phenolic type resins, which make the sheet inflexible and hard like a board. The resin used in making silicone bonded mica sheets is silicone resin, a family of resins known to remain flexible and elastic even after being fully cured and capable of surviving high temperatures that would have melted epoxy or phenolic resins. This makes the mica sheet able to be molded and bent to conform to coil and conductor shapes.
Material Composition
Harnawa Inc.’s silicone mica sheet is manufactured to the following specification:
- Raw Material: Mica paper + Silicone resin
- Percentage of Mica: More than 90%
- Percentage of Bond: Less than 10% (silicone resin bond)
- Insulation Grade: Grade H
- Heat Resistance: 500-600°C (depending on mica used)
- Flame Resistant: UL94 V-0
This is because just like other insulating materials, the large amount of mica content in relation to the small amount of resin (over 90 percent mica, and less than 10 percent bond) is intentional in ensuring performance with minimum resin content.
Understanding Phlogopite Mica Sheet vs Muscovite Mica
Flexible mica insulation sheets are made usually from either of these two minerals: muscovite mica and phlogopite mica sheet. Both materials provide great electrical insulating qualities and heat resistant features, but each material has a different performance characteristic. Phlogopite mica is characterized by higher resistance to constant heat above 500-600°C, as well as the ability to preserve its electrical features in high temperatures.
To select flexible mica sheet for extreme heat conditions, it is important to understand which type of mica is used in the product, as it may influence both thermal characteristics and natural color of the sheet.
Golden Mica Sheet — A Note on Color Variants
This type of sheet is sometimes called golden mica sheet in the market because of the golden amber color of phlogopite mica. The current availability of the mica sheet at Harnawa Inc. is in white or light silver color. For golden colored mica sheets, please contact us.
Class H Insulation Rating
The flexible mica sheet has a Class H rating, providing continuous electrical insulation capabilities suitable for motors, generators, and industrial heaters. Along with high physical thermal durability of 500–600°C, the material provides reliable insulation performance in demanding applications.
Flame Retardancy — UL94 V-0
The silicone bonded mica sheet comes with a UL94 V-0 rating for flame resistance capabilities. It is designed to extinguish quickly and reduce the risk of flammable dripping, making it suitable for applications where fire safety is important.
Key Advantages of Flexible Mica Sheet
Formability: Unlike rigid mica board, this material can be bent and formed around coils, cables, and other components without breaking.
Heat Resistance: Heat resistance from 500°C to 600°C allows usage in extremely high temperature environments where traditional polymer insulation materials may fail.
Dielectric Reliability: High mica content ensures stable electrical insulation performance under heat and electrical stress.
Fire Safety: UL94 V-0 flame resistance makes it suitable for applications where fire protection is required.
Chemical & Moisture Resistance: Due to the mineral structure of mica, the material provides resistance against chemicals and moisture.
Applications of Silicone Mica Sheet
- Motor and Generator Windings Insulation: Used where flexibility is required for wrapping around different coil shapes.
- Heating Elements and Furnaces: Suitable for insulation near direct heat sources.
- Cables and Conductors Insulation: Provides flexible fire-resistant insulation for electrical installations.
- Fire Rated Electrical Assemblies: Used where flame resistance and thermal stability are essential.
- High Temperature Industrial Applications: Suitable for metallurgy, oil and gas, and industrial machinery applications.
Completing the Insulation System
Silicone mica sheet is frequently used with other high-temperature insulation materials to create complete insulation systems for demanding electrical equipment:
Sourcing these materials from a single certified supplier ensures compatibility, consistent quality standards, and simplified procurement for OEMs.
Certifications & Quality Assurance
Each order of silicone bonded mica sheets from Harnawa Inc. is produced and inspected according to internationally recognized standards:
- UL rated including UL94 V-0 flammability rating
- Compliance with CE Marking
- Compliance with RoHS Standards
- ISO 9001:2015 certified production process
- REACH Compliance
Silicone Mica Sheet Manufacturer in India — Why Choose Harnawa Inc.
Harnawa Inc. is a manufacturer of silicone bonded mica sheets in India, providing flexible mica sheets and a wide range of electrical insulation materials for transformers, motors, generators, heaters, and high temperature industrial machinery.
What sets us apart:
- Flexible and moldable mica sheets with more than 90% mica content.
- Class H insulation materials with heat resistance up to 500 to 600°C.
- Fire-resistant material with UL94 V-0 rating.
- Pan-India supply network covering major industrial locations.
- Quality certifications including UL, CE, RoHS, ISO 9001, and REACH.
Frequently Asked Questions
1. What is silicone mica sheet made from?
Silicone mica sheet consists of high purity mica paper with silicone resin, providing flexibility along with thermal and dielectric properties.
2. How is flexible mica sheet different from rigid mica board?
The silicone resin used as a binder allows flexible mica sheets to be bent or shaped, while rigid mica boards use harder binders that create a fixed board structure.
3. Which temperatures can silicone mica sheet resist?
Continuous heat resistance reaches 500-600°C depending on the mica type used, while the product provides Class H electrical insulation performance.
4. Is silicone mica sheet resistant to fire?
Yes, it provides UL94 V-0 flame resistance along with the natural fire-resistant properties of mica.
5. How do phlogopite and muscovite differ?
Both materials provide thermal insulation and electrical insulation properties, but phlogopite mica generally offers higher heat resistance compared to muscovite mica.
