Epoxy Phenolic Resin Glass Cloth Rigid Laminated Sheet.
EPRGCR Laminated Sheet is made from alkali-free glass fabric impregnated with epoxy phenolic resin . It is made at high temperature and high pressure. It has high mechanical strength and excellent electric properties, suitable for making insulating structural parts and components in electric motor and electric apparatus. It can also be used in condition of humidity and in transformed oil.
1 Technical requirements
1.1 Appearance
Its surface should be flat and smooth, free of bubbles, wrinkles and crackles and other defects. If dent and uneven color exist, little stain is allowed. Edges should show net cut and be free of delamination and crackles.
1.2 Dimensions and tolerance
1.2.1 Length and width are as shown in Form 1.
Form 1. mm
|
Length and Width
|
Tolerance
|
|
450-970
|
±15
|
|
970-1970
|
±25
|
1.2.2 Nominal thickness and tolerance are are shown in Form 2
Form 2. mm
|
Nominal Thickness
|
Tolerance
|
Nominal Thickness
|
Tolerance
|
|
0.5
0.6
0.8
1.0
1.2
1.6
2.0
2.5
3.0
4.0
5.0
6.0
8.0
|
±0.12
±0.13
±0.16
±0.18
±0.20
±0.24
±0.28
±0.33
±0.37
±0.45
±0.52
±0.60
±0.72
|
10
12
14
16
20
25
30
35
40
45
50
60
80
|
±0.82
±0.94
±1.02
±1.12
±1.30
±1.50
±1.70
±1.95
±2.10
±2.30
±2.45
±2.50
±2.80
|
|
Note: The product of non-nominal thickness is settled upon negotiation between sellers and buyers, its deviation adopts the value of next bigger nominal thickness.
|
1.3 Bending deflection: shown in Form 3
Form 3 mm
|
Thickness
|
Bending deflection
|
|
1000 (Ruler length)
|
1000 (Ruler length)
|
|
3.0-6.0
6.0-8.0
8.0
|
?10
?8
?6
|
?2.5
?2.0
?1.5
|
1.4 Machining
The laminated sheets should be free from crackles and scraps after being machined such as sawing, drilling, lathing and milling.
1.5 The mechanical, physical and dielectric properties of the laminated sheets are as shown in Form 4.
Form 4
|
No.
|
Properties
|
Units
|
Values
|
|
1
|
Density
|
g/cm3
|
1.7-1.9
|
|
2
|
Martens temperature MD
|
C
|
?200
|
|
3
|
Thermal stability
|
C
|
200
|
|
4
|
Oil resistance in transformer oil 4h
|
C
|
130
|
|
5
|
Water absorption
|
%
|
?0.8
|
|
6
|
Bending strength
perpendicular to the laminations
|
MD
|
MPa
|
?350
|
|
TD
|
?290
|
|
7
|
Tensile strength
|
MD
|
MPa
|
?300
|
|
TD
|
?220
|
|
8
|
Sharpy impact strength
No gap
|
3mm~9.5mm
|
MD
|
kJ/m2
|
?60
|
|
TD
|
?50
|
|
>9.5mm
|
MD
|
?220
|
|
TD
|
?200
|
|
9
|
Bond strength
|
N
|
?5600
|
|
10
|
Surface resistance
|
At room temp.
|
?
|
?1.0?1013
|
|
After 24h submerged in water
|
?1.0?1011
|
|
11
|
Volume resistance
|
At room temp.
|
?om
|
?1.0?1011
|
|
After 24h submerged in water
|
?1.0?109
|
|
12
|
Insulation resistance
parallel to the laminations
|
At room temp.
|
?
|
?1.0?1010
|
|
After 24h submerged in water
|
?1.0?108
|
|
13
|
Dielectric strength
perpendicular to the laminations in transformer oil at 90C±2
|
0.5 mm-1mm
|
MV/m
|
?22
|
|
1. 1 mm-3mm
|
?20
|
|
14
|
Dissipation factor 50Hz
|
-
|
?0.030
|
|
15
|
Breakdown voltage
parallel to the laminations in transformer oil at 90C±2
|
kV
|
?30
|
|
|
|
|
|
|
|
