electrical insulation material 2440 insulation cloth Polyester Varnished glass cloth

Properties

Nominal thickness and tolerance(mm)

0.10±0.01

0.12±0.012

0.15±0.015

0.18±0.018

0.20±0.02

0.25±0.025

Anti- hydrolyze

The surface of the varnish will not be destroyed at the temperature of 105 ±2°C for 24h

Effect on oil

The acidity of the oil is not large than 0.5 in the NO 45 transformer oil at the temperature of 105 ±2°C for 72h

Effect by oil

The surface of the varnish will not be destroyed in the NO 45 transformer oil at the temperature of 105 ±2°C for 48h

Elongation

 (N/10mm

Vertical minimum

≥70

≥90

≥100

≥105

≥110

≥120

Parallel minimum

≥40

≥50

≥60

≥65

≥70

≥80

45^o

≥40

≥60

≥65

≥65

≥70

≥80

The joint of slanting cut minimum

joint of the glass cloth before impregnating varnish

≥20

≥25

≥30

≥30

≥35

≥35

joint of the glass cloth after impregnating varnish

≥20

≥20

≥20

≥30

≥30

≥30

Elongate to 10% (45^O)

2~12

2~12

3~15

3~15

4~16

5~20

Extending rate when breaking down .% minimum

Vertical

≥1.5

≥1.5

≥2.0

≥2.0

≥2.5

≥3.0

45^o

≥15

≥15

≥15

≥18

≥20

≥20

Edge Laminating strength ,kgf(N),minimum

Vertical

≥5

≥6

≥7.5

≥10

≥20

≥25

45^o

≥50

≥60

≥75

≥80

≥90

≥120

Breakdown voltage kv ,minimum

23±2°C

≥5.0

≥6.0

≥7.0

≥7.5

≥8.0

≥9.0

155±2°C

≥2.5

≥3.0

≥3.5

≥3.8

≥4.0

≥4.5

Elongate to 3% (45^o)

≥3.0

≥3.0

≥3.5

≥4.0

≥4.0

≥4.5

Effect by damp (23 ±2°C)

≥2.5

≥3.0

≥3.5

≥3.5

≥4.0

≥4.5

Storage requirements

Should be stored at a temperature not exceeding 20 °C, dry, clean and well-ventilated warehouse, must not be near the fire source, heating and by sunlight. The best kept erect