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
(20±<5°C>) | — | 10
(20<5°C>) |
Insulation resistance parallel to lamination A: Under normal conditions D-24/23:Immersion in water |
≥
| W |
1.0×108
—
|
— —
|
— —
|
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 |
