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

许昌睿源绝缘材料有限公司

3721 phenolic cotton cloth laminated rod