D279 Preimpregnated material
Dcomposition
D279 Preimpregnated material consisting of polyester film/ployester non-woven fabric composite is frist impregnated with epoxy resin and then cured.
Charactersistic and usage
D279 is with the properties of long storage life, low curing temperature and short curing time.D279 shows excellent electrical properties, heat resistance and adhesive properties, heat resistance of class F. This material is suitable for layer insulation between low tension coils made of copper or alaminium foil winding in dry transformer as well as slot and turn insulations in class B and F electric machine and electric appliance.
Main technical values
|
No. |
Properties |
Units |
Values |
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|
1 |
Nominal thickness |
mm |
0.16 |
0.18 |
0.20 |
0.23 |
0.25 |
|
2 |
Thickness tolerance |
mm |
±0.030 |
±0.035 |
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|
3 |
Tensile strength lengthwise, no bending |
N/10mm |
≥70 |
≥80 |
≥100 |
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|
4 |
Resin content |
% |
35±5 |
30±5 |
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|
5 |
Volatide content |
% |
≤1.5 |
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|
6 |
Content of solutable resin |
% |
≥85 |
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|
7 |
Dielectric strength |
MV/m |
≥40 |
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|
8 |
Strength shear strength |
MPa |
≥3.0 |
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|
Standard |
Q/DJ3-210-1994 |
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Note: Properties can be agreed separately if customer has special requirement.
Epoxy Preimpregnated Material
 |
Referring curing factor
|
Curing temperature (℃) |
130 |
140 |
150 |
|
Curing time (h) |
5 |
4 |
3 |
Packaging and storage
D279 is wrapped with plastic film in clean and dry carton.
The storage life is half a year at temp lower than 25℃ since delivery. The material after the storage life may be used if it is tested qualified according to the standard. Product shall be stored in a dry and clean stockhouse with good ventilation and away from fire and away from fire and sunshine.