Silicone Bonded Mica Sheet

Silicone Bonded Mica Sheet | High-Temperature Electrical Insulation Board

Silicone Bonded Mica Sheets are high-performance rigid insulation materials manufactured by bonding natural mica paper (muscovite or phlogopite) with high-grade silicone resin and curing it under heat and pressure. This structure provides excellent thermal resistance, dielectric strength, flame retardancy, and mechanical stability, even under extreme operating conditions.

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Silicone Bonded Mica Sheet | High-Temperature Electrical Insulation Board

Silicone bonded mica sheets are specifically designed for applications where high temperature, electrical stress, arc exposure, and safety requirements are critical. The silicone resin binder enhances flexibility, toughness, and resistance to thermal shock, while the mica content ensures outstanding insulation performance with low smoke and no toxic gas emission.

These sheets maintain stable electrical properties in dry, humid, and oil-exposed environments, making them ideal for electrical equipment, heating systems, and high-temperature industrial applications.

Product Details

Product Name

Silicone Bonded Mica Sheet

Material

Mica paper + Silicone resin

Mica Content

> 90%

Bond Content

< 10%

Insulation Class

Class H

Continuous Heat Resistance

500–600 °C (mica dependent)

Flame Retardancy

UL94 V-0

Color

White / Light Silver

Rigid Muscovite & Phlogopite Mica Sheets – Technical Specifications

Property	Unit	Rigid Muscovite Sheet		Rigid Phlogopite Sheet		Test Standard
Property	Unit	CD563M	CD563MG	CD563P	CD563PG	Test Standard
Mica Content	%	≥ 90	≥ 90	≥ 90	≥ 90	IEC 60371-2
Bond Content	%	≤ 10	≤ 10	≤ 10	≤ 10	IEC 60371-2
Density	g/cm³	1.7 – 2.35	1.7 – 2.35	1.7 – 2.35	1.7 – 2.35	IEC 60371-2
Heat Resistance	Continuous (°C)	500	500	600	600	/
Heat Resistance	Intermittent (°C)	800	800	1000	1000	/
Heat Loss	At 500 °C (%)	≤ 1.0	≤ 1.0	≤ 1.0	≤ 1.0	IEC 60371-2
Heat Loss	At 700 °C (%)	≤ 2.0	≤ 2.0	≤ 2.0	≤ 2.0	IEC 60371-2
Flexural Strength	N/mm²	≥ 200	≥ 230	≥ 150	≥ 200	ISO 178
Tensile Strength	N/mm²	140 – 150	140 – 150	100 – 110	100 – 110	ISO 527
Water Absorption (24h / 23 °C)	%	≤ 1.5	≤ 1.5	≤ 1.5	≤ 1.5	ISO 62
Dielectric Strength	kV/mm	> 20	> 20	> 20	> 20	IEC 60243
Volume Resistivity	23 °C (Ω·cm)	> 10¹⁷	> 10¹⁷	> 10¹⁷	> 10¹⁷	IEC 60093
Volume Resistivity	500 °C (Ω·cm)	> 10¹²	> 10¹²	> 10¹²	> 10¹²	IEC 60093

NEMA, IEC, Mil Spec Material Comparative Table
NEMA	IEC	Mil Spec	Resin	Substrate
NEMA G-10	EPGC 201, 21*	MIL-I-24768/2 GEE	Epoxy	Glass Cloth
NEMA FR4	EPGC 202, 23*	MIL-I-24768/27 GEE-F	Epoxy	Glass Cloth
NEMA G-11	EPGC 203, 22*	MIL-I-24768/3 GEB	Epoxy	Glass Cloth
NEMA FR5	EPGC 204	MIL-I-24768/28 GEB-F	Epoxy	Glass Cloth
—	EPGC 205	—	Epoxy	Glass Cloth
—	EPGC 306	—	Epoxy	Glass Cloth
—	EPGC 307	—	Epoxy	Glass Cloth
—	EPGC 308	—	Epoxy	Glass Cloth
—	EPGC 309	—	Epoxy	Glass Cloth
—	EPGC 310	—	Epoxy	Glass Cloth
—	EPGC 311	—	Epoxy	Glass Cloth
—	EPGM 203	—	Epoxy	Glass Mat
—	EPPC 301	—	Epoxy	Polyester Cloth
NEMA G-5	MFGC 201, 20*	MIL-I-24768/8 GMG	Melamine	Glass Cloth
NEMA G-9	MFGC 201	MIL-I-24768/1 GME	Melamine	Glass Cloth
NEMA C	PFCC 201, 23*	MIL-I-24768/16 PBM	Phenolic	Cotton Cloth
NEMA CE	PFCC 202, 22*	MIL-I-24768/14 FBG	Phenolic	Cotton Cloth
NEMA L	PFCC 203	MIL-I-24768/15 FBI	Phenolic	Cotton Cloth
NEMA LE	PFCC 204, 21, 24	MIL-I-24768/13 FBE	Phenolic	Cotton Cloth
NEMA X	PFCP 201, 21*	MIL-I-24768/12 PBM	Phenolic	Cellulosic Paper
NEMA XP	PFCP 201	MIL-I-24768/19 PBM-P	Phenolic	Cellulosic Paper
NEMA XXX	PFCP 204	MIL-I-24768/10 PBE	Phenolic	Cellulosic Paper
NEMA XX	PFCP 202, 23*	MIL-I-24768/11 PBG	Phenolic	Cellulosic Paper
NEMA XXP	PFCP 203	MIL-I-24768/21 PBG-P	Phenolic	Cellulosic Paper
NEMA XXXP	PFCP 204	MIL-I-24768/22 PBE-P	Phenolic	Cellulosic Paper
NEMA XPC	PFCP 207	MIL-I-24768/20 PBM-C	Phenolic	Cellulosic Paper
NEMA G-3	PFGC 201, 21*	MIL-I-24768/18 GPG	Phenolic	Glass Cloth
NEMA GPO-1	UPGM 201	MIL-I-24768/4	Polyester	Glass Mat
NEMA GPO-2	UPGM 202	MIL-I-24768/5	Polyester	Glass Mat
NEMA GPO-3	UPGM 203	MIL-I-24768/6	Polyester	Glass Mat
—	UPGM 205	—	Polyester	Glass Mat
—	PIGC 301	—	Polyimide	Glass Cloth
NEMA G-7	SIGC 201, 21*	MIL-I-24768/17 GSG	Silicone	Glass Cloth