High-voltage resistant sheets
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The D461 and MCT-BS high-voltage resistant sheets are made by combining mica paper with epoxy resin.
They are also used for bulkhead plates (barrier plates) and rigidity reinforcement boards in high-voltage equipment. They provide excellent electrical insulation even though the board is thin, and is therefore useful for making insulation materials thinner and lighter.
MCT-BS has obtained the UL94 V-0 standard.
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Characteristics
Excellent in corona resistance, arc resistance and tracking resistance, and also have good high-frequency property.
Thanks to excellent workability, cutting, machining, and punching can be done easily.
These products are unlikely to warp, and possess high mechanical strength.
They have excellent resistance to water.
In the field of materials for electrical appliances and electronic devices, they can contribute to weight reduction, flame proofing, and cost reduction.
Use
Electrical insulation bulkhead plates in switch boards
Shield (barrier) for aerial switches
Insulation washers and spacers
Heat-resistant insulation reinforcing plates
Composition, standard dimensions and properties
D461
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Composition,standard dimensions
Mica Mica paper based on uncalcined muscovite Binder Epoxy Standard thickness（mm） 0.20～20.00 Width × length（mm） 600×1000 -
Properties
Nominal thickness（mm） 0.55 Apparent density（kg/㎥） 2.2×10³ Dielectric breakdown strength（kV/mm） 56 Insulation resistance：Normal state（MΩ） 2000 or more Surface resistivity（Ω） 7×10¹⁴ Dielectric constant：60Hz（F/m） 4.0 Dielectric constant：1MHz（F/m） 3.9 Dielectric tangent：60Hz（%） 1.4 Dielectric tangent：1MHz（%） 0.5 Flexural strength（MPa） 418 Elastic modulus in bending（GPa） 55 Thermal conductivity（W/m·K） 0.42 Arc resistance（s） 181 Comparative tracking index/CTI（V） 600 Combustibility 94V-1（t1.0mm or more）
94V-0（t5.0mm or more）
- *Measured in compliance with JIS C 2116 and JIS K 6911.
- *The above values are examples from tests, and are not guaranteed values.
MCT-BS
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Composition,standard dimensions
Mica Mica paper based on uncalcined muscovite Binder Flame-retardant epoxy Standard thickness（mm） 0.20～20.00 Width × length（mm） 600×1000 -
Properties
Nominal thickness（mm） 0.60 Apparent density（kg/㎥） 2.3×10³ Dielectric breakdown strength（kV/mm） 39 Insulation resistance：Normal state（MΩ） 2000 or more Surface resistivity（Ω） 3×10¹⁴ Dielectric constant：60Hz（F/m） 4.0 Dielectric constant：1MHz（F/m） 3.8 Dielectric tangent：60Hz（%） 1.3 Dielectric tangent：1MHz（%） 0.4 Flexural strength（MPa） 378 Elastic modulus in bending（GPa） 48 Thermal conductivity（W/m·K） 0.33 Arc resistance（s） 182 Comparative tracking index/CTI（V） 600 Combustibility 94V-0
- *Measured in compliance with JIS C 2116 and JIS K 6911.
- *The above values are examples from tests, and are not guaranteed values.