Factory direct Phenolic paper tube bakelite rod phenolic cotton cloth tube for insulation

NO

Properties

Units

Values

3025

3026

3027

3028

1

Apperance

——

Surface should be smooth, not allow any impurities and other obvious defects, end should be without any delamination and cracks. Allow a small amount of stain.

2

Density

g/cm3

1.30-1.42

1.30-1.42

1.30-1.42

1.30-1.42

3

Vertical bending strength

MPa

≥105

≥110

≥90

≥100

4

Tensile strength

MPa

≥65

≥85

≥60

≥80

5

Impact strength

(Charpy, notched, vertical)

KJ/m2

≥8.8

≥7.0

≥7.8

≥6.0

6

Adhesive strength

N

≥5400

——

——

——

7

Vertical electric intensity

(90 ± 2 ℃ transformer oil)

MV/ mΩ

≥2.0

≥1

——

——

8

Insulation resistance     (after immersion in water)

mg

≥1.0×106

≥1.0×106

≥5.0×107

≥5.0×107

9

Water absorption

KV

210-540

190-540

133-373

127-373

10

Parallel breakdown voltage

≥1

≥1

≥18

≥20

11

Temperature Index

≥120

≥120

≥120

≥120

Note : 3026 is made of cotton (fine) cloth impregnated with phenolic resin by hot pressing. It has high mechanical properties, suitable for rotating machinery vibration and wear parts.

3027 is made of cotton (coarse) impregnated with phenolic resin by hot pressing. It has high mechanical properties, as insulating structural parts for machinery, electrical machinery, electrical equipment, it can be used in transformer oil. Electrical performance of 3026 is better than that of  3025 .

3028 is made of cotton (fine) impregnated with phenolic resin by hot pressing. Mechanical Properties of 3028 is the same as 3026, but the electrical performance of 3028 is better than 3026, it can be used as small parts.