Details
The D461/D461S rigidity reinforcement insulation sheets are mica sheets developed for the purpose of reducing the weight and reinforcing the rigidity of mechanical components used for laptops. The D461S is a product that has improved the surface smoothness of D461.
Characteristics
- (1) They have excellent strength, and fragments are not scattered even when subjected to impact.
- (2) They have high compressive strength and can be designed to thin and lighten the product for its slight curve and warp.
- (3) Thanks to excellent workability, cutting, machining, and punching can be done easily.
- (4) They have obtained the UL94-V1 standard. (D461: from 1 mm, D461S: from 0.3 mm)
- (5) They have smooth surface and texture like glass.
Use
- (1) Rigidity reinforcement board for laptops
- (2) Touchpad inductor
Composition and standard dimensions
| D461 | D461S | |
|---|---|---|
| Mica | Mica paper based on uncalcined muscovite | |
| Binder | Epoxy | |
| Standard thickness (mm) | 0.20 to 20.00 | 0.30 to 1.0 |
| Standard dimensions (mm) | 600 × 1000 | |
Other sizes are available upon request.
Properties
| D461 | D461S | |||
|---|---|---|---|---|
| Nominal thickness | mm | 0.55 | 0.50 | |
| Apparent density | kg/m3 | 2.2 × 103 | 2.5 × 103 | |
| Dielectric breakdown strength | kV/mm | 56 | 54 | |
| Insulation resistance | Normal state | MΩ | 2000 or more | 2000 or more |
| Surface resistivity | Ω | 7× 1014 | 1× 1015 | |
| Dielectric constant | 60Hz | F/m | 4.0 | 5.9 |
| 1MHｚ | 3.9 | 5.2 | ||
| Dielectric tangent | 60Hz | % | 1.4 | 0.7 |
| 1MHｚ | 0.5 | 0.5 | ||
| Flexural strength | MPa | 418 | 483 | |
| Elastic modulus in bending | GPa | 55 | 77 | |
| Thermal conductivity | W/m·K | 0.42 | 0.43 | |
| Surface roughness (Ra) | μm | 0.62 | ||
| Arc resistance | S | 181 | 181 | |
| Comparative tracking index (CTI) | V | 600 | ||
| Combustibility | 94V-1 (t1.0 mm or more) | 94V-1 (t0.3 mm or more) | ||
| 94V-0 (t5.0 mm 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.