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Over the enamelled copper wire, glass fibre is wound. Glass fibre adds mechanical strength and significantly enhances the thermal resistance of the wire. It is particularly useful in high-temperature applications and provides additional protection against abrasion and mechanical damage.
Glass fibre winding involves wrapping the copper wire with a layer of glass fibre. This layer serves as additional insulation and mechanical protection, enhancing the wire’s durability and resistance to thermal and mechanical stress. Glass fibre is high tensile strength and resistance to high temperatures.
Temperature index 155
The temperature index of 155 signifies that the wire can operate reliably at temperatures up to 155°C. And it without significant degradation of its insulating properties. This rating is crucial for applications involving high thermal loads, ensuring long-term performance and safety.
The temperature index is a measure of the thermal endurance of an insulating material. It indicates the maximum temperature at which the material can operate continuously without significant loss of its insulating properties over a specified period.
| Thermal Class | 155(Class F) |
| Dimension | width(a): 0.90-5.60mm；thickness(b)：3.15-16.00mm |
| Standards | IEC、GB/T、JIS、NEMA |
| lnsulation thickness | G1,G2 |
The enamelled wire shall have a temperature index of at least 155 and shall be agreed between purchaser and supplier.
The temperature index of the wire is dependent upon the type of impregnating agent used. The impregnating agent applied to the glass fibres shall have a minimum temperature index of 155.
The covering shall have one of the following grades of thickness:
-GL1: one glass fibre covering over a bare conductor;
-GL2: two glass fibre coverings over a bare conductor:
-grade 1 GL1: one glass fibre covering (GL1) over grade 1 enamelled conductor (grade 1);
-grade 1 GL2: two glass fibre coverings (GL2) over grade 1 enamelled conductor (grade 1);
-grade 2 GL1: one glass fibre covering (GL1) over grade 2 enamelled conductor (grade 2);
-grade 2 GL2: two glass fibre coverings (GL2) over grade 2 enamelled conductor (grade 2).
Glass Fibre Wire Appearance
The fibrous covering shall be essentially smooth and continuous. And free from physical damage and foreign material when examined with normal vision, as wound on the original spool or reel. Evidence of physical damage includes gashes, broken fibre strands, and the like.
Springiness：The wire shall not exceed the maximum spring back of 5.5 degrees.
Fibre covered bare wires：The specimen shall be elongated 10%. There shall be no loss of adhesion of the fibre covering.
Fibre covered enamelled wires：The specimen shall be elongated 10%. There shall be no loss of adhesion either of the fibre covering or the enamel.
Electrical resistance：The resistance of the wire shall be expressed as the d.c. resistance at 20°C. The method used shall provide an accuracy of 0.5 %. One measurement shall be made.
