Properties

Unit

Value

Test Value 1

Test Value 2

Test Value 3

Test Value 4

Test Value 5

Flexural strength perpendicular to laminations  3721 3723 insulation fabric resin Bar cotton cloth laminated Phenolic Material catalin Bakelite rod                                               

≥

MPa

110

113

112

112

113

112

Bonding strength (≥10mm in thickness)                    

≥

N

-

-

-

-

-

-

Impact strength on parallel laminations(Charpy)

≥

KJ/m²

7.0

7.2

7.1

7.3

7.2

7.3

Insulation resistance after immersion in water (D-24/23)                                          

≥

Ω

1×10⁶

1×10⁶

1×10⁶

1×10⁶

1×10⁶

1×10⁶

Dielectric strength perpendicular to laminations 
(in 90±2ºC transformer oil, 1 mm in thickness)                                                               

≥ 

MV/m

0.82

0.84

0.83

0.85

0.84

0.85

Breakdown voltage parallel to laminations 
(in 90±2ºC transformer oil)     

≥            

KV

1

1.2

1.15

1.3

1.15

1.2

Permittivity (48-60Hz)                

≤

-

-

-

-

-

-

-

Density

g/cm³

(1.3-1.4)

1.36

1.35

1.37

1.35

1.36

Water absorption (D-24/23, 1.6mm in thickness)      

≤

mg

220

210

211

211

210

210

Color

-

Brown           

Brown           

Brown

Brown

Brown

Brown