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Ref.: IEC B.3.1
 1. COMPOSITION AND PRESENTATION
Laminated paperboard is made of High-quality transformer board with casein, polyester resin or phenolic resin impregnated sheet by hot pressing process.
2. PROPERTIES & APPLICATIONS
It has obviously good properties in machenical strength and insulation strength than laminated wood. Large square laminated board is now available. It widely applied in strips, cylinders, spacers, plates, supports etc. as the insulating parts for oil transformer.
3. MAIN TECHNICAL CHARACTERISTICS
Table-01
|
Properties |
Unit |
Value |
|
A |
B |
C |
|
Density |
g/cm3 |
1.15-1.35 |
1.15-1.35 |
1.15-1.35 |
|
Water content |
% |
< 8.0 |
< 6.0 |
¡Ü 6.0 |
|
Shrinkage |
MD |
% |
< 0.5 |
< 0.5 |
¡Ü 0.5 |
|
CMD |
< 0.7 |
< 0.7 |
¡Ü 0.7 |
|
Ash content |
% |
< 0.8 |
< 0.8 |
< 0.8 |
|
Ration of absorption oil |
% |
> 11 |
> 8.0 |
¡Ý 9.0 |
|
Tensile strength |
Lengthwise |
Mpa |
¡Ý 100 |
¡Ý 100 |
¡Ý 100 |
|
Widthwise |
¡Ý 85 |
¡Ý 85 |
¡Ý 85 |
|
Compression strength |
Lengthwise |
Mpa |
¡Ý 125 |
¡Ý 145 |
¡Ý 120 |
|
Widthwise |
¡Ý 90 |
¡Ý 100 |
¡Ý 70 |
|
Moisture content |
% |
¡Ü 6 |
¡Ü 6 |
¡Ü 6 |
|
Conductivity of aqueous extract |
ms/m |
< 11 |
< 8.4 |
< 8.0 |
Table-02 Size and Tolerance
|
T/Thickness |
Length |
Width |
|
Size |
Tolerance |
Size |
Tolerance |
Size |
Tolerance |
|
T¡Ü10 |
¡À0.5 |
2000 |
¡À10 |
1000 |
¡À10 |
|
10 |
¡À1.0 |
2500 |
¡À10 |
1350 |
¡À15 |
|
20 |
¡À1.5 |
-- |
-- |
-- |
-- |
|
30 |
+1.75 / -1.5 |
-- |
-- |
-- |
-- |
|
200¡ÝT>50 |
¡À2 |
-- |
-- |
-- |
-- |
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