Fibre Vulcanised Sheets
Fibre Vulcanised
Vulcanised Fibre consists of superimposed layers of especially prepared paper chemically treated so that the laminae are virtually destroyed with the production of a homogeneous mass of converted cellulose in the form of sheet or tube. Its is a dense and hard material with excellent electrical, mechanical, heat and arc resistance properties.
|
Specific gravity |
1.0 to 1.5 | ||
|
specific heat |
(kcal/kg °C) | 0.4 | |
|
Coefficient of linear |
- | - | |
|
Thermal conductivity |
(kcal/mh °C) | 0.21 to 0.26 | |
|
temperature continuous |
°C | 110 | |
|
Affected point |
°C | 180 | |
|
Shrinkage in air |
longitudinal (%) | 100 °C, 24 hrs | 0.5 to 1.0 |
| flat wise (%) | 3.5 to 4.5 | ||
|
Water absorption(24hrs) |
(%) | 15 to 50 | |
|
Tensile strength - longitudinal |
(kg/mm2) | 8 to 12 | |
|
shearing strength |
longitudinal | (kg/mm2) | 6 to 8 |
| crosswise | 4 to 6 | ||
|
Bending strength |
longitudinal | (kg/mm2) | 15 to 20 |
| crosswise | 13 to 50 | ||
| Elastic modulus | (kg/mm2) | 50000 | |
| Hardness | (Brinnel) | 10 to 15 | |
| (Rockwel) | R 90 to 110 | ||
| Ash content | (%) | < 5 | |
| Insulation resistance | (ohm cm) | 6 x 108 | |
| Dielectric resistance - parallel | (kv/mm) | 3 to 5 | |
| Arc - resistance | (sec) | 140 | |
