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Diamond Dotted Paper/DDP is made of electrical insulation paper with Diamond-shape epoxy resin dotted in both sides.

The epoxy resin used in DDP contains a kind of incubative hardener material, it is a dry ad crisp material at normal temperature(below 35 degree)

This product has good dielectric properties and good machenical properties after being heat-solidification. It can be used as coils and between layers of oil immersed power and distribution transformers.

 thickness:  0.05 mm  0.08 mm  0.13 mm  0.15 mm  0.17 mm  0.25 mm

Item Index. Unit Value
1 Thickness and tolerance mm 0.08±0.005 0.13±0.007 0.18±0.010 0.20±0.010 0.25±0.010
2 Density g/cm3 0.85~1.10
3 Single thickness μm 10~15
4 Moisture content % 4.0~8.0
5 Oil-absorption % ≥20
6 Bond strength at room temp. kPa ≥650
100°C±2°C ≥400
7 Pollution for transformer oil no pollution
8 Tensile Strength lengthwise N/10mm ≥60 ≥110 ≥160 ≥180 ≥230
crosswise ≥30 ≥50 ≥70 ≥80 ≥100
9 Tearing Strength lengthwise Mn ≥450 ≥900 ≥1350 ≥1500 ≥2000
crosswise ≥500 ≥1000 ≥1500 ≥1700 ≥2300
10 Breakdown voltage in air KV ≥0.88 ≥1.37 ≥2.00 ≥2.10 ≥2.25
in oil ≥4.40 ≥7.00 ≥9.00 ≥9.80 ≥11.50

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