Properties

Unit

Grade

3520 Phenolic Paper Laminate Tube

Inside diameter(5-25mm)

Inside

diameter

(＞25mm)

Density

g/cm³

≥1.03

≥1.10

Water absorption rate

%

Wall thickness 3mm   ≤8

Thermostability(24h)

℃

120

120

Flexural strength

MPa

≥50.0

≥60.0

Compressive strength

MPa

≥50.0

≥60.0

Shear strength

MPa

—

—

Surface

resistance

Under normal condition

W

—

—

In case of humidity

—

—

Volume

resistivity

Under normal condition

W×m

—

—

In case of humidity

—

—

Impregnated In water

—

—

Insulation

resistance

Under normal condition

W

—

—

Impregnated in water

—

—

Dissipation factor

50Hz

≤0.03

≤0.03

Dielectric strength perpendicular to laminations(withstand voltage)

(in 90±2℃/5min transformer oil)

kV/mm

Wall

thickness

1.5-2.5mm

≥8.5

≥8.5

>2.5-3.5mm

≥8.0

≥8.0

>3.5-4.5mm

≥7.0

≥7.0

>4.5-6mm

≥6.5

≥6.5

>6-9mm

≥6.0

≥6.0

Dielectric break down parallel to laminations

(in 90±2℃/5mintransformer oil)

kV

20

25

Surface withstand voltage

(in case of humidity, undernormal condition air

withstand voltage 1 min)

kV

12

12