5. Property : Fine cotton,stronger mechanical and electrical performance.
|
No. |
Project |
Unit |
3021 |
3025 |
3025—A |
3026 |
3027 |
3241 |
|
|
1 |
Appearance |
– |
Smooth surface, uniform color, no bubbles, no wrinkles, edge cutting neat, no stratification. | ||||||
|
2 |
Density |
g/m³ |
1.25～1.4 |
1.3～1.4 |
1.75-1.90 |
||||
|
3 |
Vertical layer bending strength(normality) |
MPa |
≥120 |
≥100 |
≥90 |
≥110 |
≥125 |
≥300 |
|
|
4 |
Tensile strength |
MPa |
≥100 |
≥80 |
|||||
|
5 |
Parallel impact strength (Simply supported beam) |
KJ/m2 |
– |
≥7.8 |
≥50 |
||||
|
6 |
Parallel layer shear strength |
MPa |
≥10 |
≥25 |
≥25 |
≥20 |
≥25 |
≥30 |
|
|
7 |
Adhesive strength |
N |
≥3600 |
– |
|||||
|
8 |
Electrical strength |
Vertical layer（in 90℃transformer oil ）( thickness 1mm ) |
Kv/mm |
≥15.8 |
≥5.1 |
≥5.1 |
≥5.1 |
≥5.1 |
≥8.0 |
|
Parallel layer breakdown voltage（in 90℃transformer oil ） |
kv |
≥35 |
≥20 |
≥35 |
|||||
|
9 |
Insulation resistance after water immersion |
Ω |
– |
≥5*107 |
≥1.0*108 |
||||
|
10 |
Dielectric constant（1MHz) |
– |
≤5.5 |
||||||
|
11 |
PTI |
– |
≥100 |
– |
|||||
|
12 |
Water absorbing ( thickness 1-20mm) |
mg |
180～970 |
206～406 |
136～277 |
64-193 |
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