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3721 phenolic cotton laminated rodlor:claret,red
2.size:1000mm
3.diameter:8--200mm
4.temperater grade :e glass
3721 phenolic cotton cloth laminated rod
The products are made of cotton which dipped into the phenolic aldehyde resin then heat pressed by mould.With high mechanical properties and processing properties.heat-resisting grade is E. It is Suitable for electrical equipment of insulation structure parts and transformer.
According to the properties ,they can be divided into three kinds:
3721,3723,3725,3721 is better than 3723< in> mechanical strength; 3723is an economical product versus 3721 ,3725 Similar to NEMA grade LE.
2,Technic Requirement
1. Guise:smooth,no air bubble,no oil stain& impurity,allow have inequality color, scrap,a little not level which does not interferethe usage;Diameter exceed 25mm,allow have crack which does not interferethe usage
2,Size:
Dia | Tolerance | Dia | Tolerance |
6~12 | ±0.5 | >28~45 | ±1.5 |
>12~16 | ±0.7 | >45~65 | ±2.0 |
>16~28 | ±1.0 | >65~200 | ±2.3 |
3. Warp
Dia(mm) | warp(%) |
6 >6~19 >19 | ≤2.0 ≤1.0 ≤0.5 |
4,After machining it should be without interlayer and lose.
5,Physical,Mechanical and Dielectric performance
Properties | Unit | Grade | |||
Phenolic Cotton Cloth Molded Rod | |||||
3721 | 3723 | 3725 | |||
Flexural strength | >= | MPa | 118 | 88 | 83 |
Tensile strength | >= | MPa | 78 | — | — |
Compressive strength (Axial) | >= | MPa | — | — | 138 |
Breakdown voltage Parallel to laminations (in transformer oil) | >= | kV | 10 | — | 10 |
Insulation resistance parallel to lamination A: Under normal conditions D-24/23:Immersion in water |
| W |
|
|
|
Density |
| g/cm3 | (1.25-1.40) | ||
Water absorption rate (D-24/23, Φ25mm) | <= | % | 1.0 | 1.0 | 1.0 |
Flammability |
| Class | — | — | — |
Color |
| — | Natural | ||
Reference standard |
| — | Q/TXXFR004-2009 | ||
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