OKABE MICA STUDIO
EN/JP

PRODUCT RESERCH

Details

The Damma 550L/Damma 700L thermal insulation sheets are made by combining mica paper with silicone adhesives. These insulators have excellent machinability with electrical insulation/heat resistance/thermal insulation properties.

Characteristics
  • (1) Excellent heat resistance (550L: 550℃, 700L: 700℃)
  • (2) The lamination effect of mica scales achieves flexural strength and compressive strength that are several times stronger compared to normal insulators, which allows for use in structural materials.
  • (3) Excellent arc resistance/corona resistance/tracking resistance/withstand voltage.
  • (4) Easy to perform machine processing such as machining/drilling. We can custom-make various shapes for washers, flanges, etc.
Use
  • (1) Thermal insulating washers for electrical furnace
  • (2) Thermal insulating plates for induction furnace
  • (3) Thermal insulating parts for FA equipment
  • (4) Insulating flanges for high-temperature fluid piping
Composition and standard dimensions
Damma 550L Damma 700L
Mica Mica paper based on uncalcined muscovite Mica paper based on phlogopite
Binder Silicone
Thickness (mm) 1.2 to 30.0
Width × length (mm) 500 × 1000
Properties
Damma 550L Damma 700L
Nominal thickness mm 10 10
Apparent density kg/m3 2.2 × 103 2.1 × 103
Loss of mass by heating (550℃× 2 hr) wt% 0.75 0.70
Flexural strength MPa 130 120
Tensile strength MPa 150 135
Insulation resistance Normal state 2000 or more 2000 or more
At high temperature
Dielectric breakdown strength kV/mm 35 33
Compressive strength MPa 400 300
Young's modulus GPa
Linear expansion coefficient 1/K 9 to 12 × 106 9 to 12 × 106
Thermal conductivity W/m·K 0.22 0.22
Arc resistance sec 420 or more 420 or more
Comparative tracking index (CTI) V 600 or more 600 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.