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% | 0.50 | 0.47 | |
| Flexural strength | MPa | 145 | 80 | |
| Tensile strength | MPa | 106 | 47 | |
| Insulation resistance | Normal state | MΩ | 2000 or more | 2000 or more |
| At high temperature | 2000 | 990 | ||
| Dielectric breakdown strength | kV/mm | 28 | 30 | |
| Compressive strength | MPa | 500 | 370 | |
| Young's modulus | GPa | 80 | 67 | |
| Linear expansion coefficient | 1/K | 1.1×10 |
1.3×10 |
|
| Thermal conductivity | W/m·K | 0.18 | 0.12 | |
| 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.