Heron Brand Tufnol
Heron Brand Tufnol is a first class electrical insulating material with very low moisture absorption. It is especially suitable for use in humid or tropical environments, where its electrical properties are retained to a high degree. Heron Brand Tufnol has excellent electric strength, very high insulation resistance after immersion in water and is designed to meet the very highest electrical standards for phenolic paper materials in BS and IEC Specifications. Heron Brand Tufnol is easy to machine and can be hot punched up to 3.2mm thick. Applications:
A wide range of electrical insulation applications where high insulation performance is required in a moist or humid environment. Customers may also consider the use of epoxy and other materials for these applications.
Availability:
| Typical Sheet Size (mm): |
1200x1200 |
| Thickness (mm): |
1.6 through to 25.4 |
Specifications:
| Sheet |
BS EN 60893-3-4 Type PF CP 204 |
Technical Specification:
| Property |
Unit |
Result |
| Cross Breaking Strength |
MPa |
146 |
| Impact Strength - notched - charpy |
kJ/m² |
2.7 |
| Compressive Strength - flatwise |
MPa |
350 |
| Compressive Strength - edgewise |
MPa |
215 |
| Resistance to Flatwise Compression |
% |
1.2 |
| Shear Strength - flatwise |
MPa |
110 |
| Water Absorption - 1.6mm thick |
mg |
20 |
| Water Absorption - 3mm thick |
mg |
25 |
| Water Absorption - 6mm thick |
mg |
30 |
| Water Absorption - 12mm thick |
mg |
45 |
| Electric Strength flatwise in oil at 90ºC - 1.6mm thick |
MV/m |
19 |
| Electric Strength flatwise in oil at 90ºC - 3mm thick |
MV/m |
15 |
| Electric Strength flatwise in oil at 90ºC - 6mm thick |
MV/m |
10 |
| Electric Strength flatwise in oil at 90ºC - 12mm thick |
MV/m |
7 |
| Electric Strength edgewise in oil at 90ºC |
KV |
60 |
| Insulation resistance after immersion in water |
ohms |
2x1011 |
| Loss Tangent at 1 MHz |
|
0.035 |
| Permittivity at 1 MHz |
|
4.9 |
| Relative Density |
|
1.36 |
| Maximum Working Temperature - Continuous |
ºC |
90 |
| Maximum Working Temperature - Intermittent |
ºC |
120 |
| Thermal Classification |
|
Class E |
| Thermal Conductivity through Laminae |
W/(mK) |
0.27 |
| Thermal Expansion in plane of Laminae |
X 10-5 / K |
1.7 |
| Specific Heat |
kJ / (kgK) |
1.5 |
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