Diamond kraft Paper DDP for Transformer layer Insulation

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Product Details

This is product id manufactured from insulation press paper and partially coated with epoxy resin on one or both side. The dots are arranged to have diamond pattern consisting of 9.5mm*9.5mm diamonds with 15.9 center spacing. This design improves the mechanical strength of oil-immersed transformer winding without reducing partial discharge levels. It is suitable for turn-to -turn insulation of coil wires on oil-immersed power transformers and suitable for layer insulation of coils on distribution transformers.

Diamond dotted paper DDPDDP kraft paper

Forms of supply

1) Avaliable width: DDP strip minimum 4mm to master roll 1900mm.

2) Curing condition for Hecheng DDP:  cured for 90℃ ± 5℃ by 3 hours first, then for 125℃ ± 5℃ by 6 hours.

3) Storage and Shelf life: Minimum 12 mouths, to be stored in dry, clean warehouse, avoid direct sunlight and heat.

PropertyUnitValue






Thicknessmm0.080.130.150.180.200.250.300.35---0.50
mil35678101415-20
Densityg/cm30.85~1.10






One side coatingum6~12






Moisture content%4.0~8.0






Ash content%≤1.0






Water extraction of Electrical conductitymS/m≤10






PH Water extract
6.5~8.5






Oil absorption%≥20






Bond strengthKpa≥650






Tensile strength N/10mmTD60100110130160200≥250
MD3050557080100≥120

BDVKV0.881.371.502.002.102.25≥2.50

Main Features

Name: Diamond dotted presspaper 

Color:  Red, Yellow, Natural

Original: China

Hecheng DDP can also be supplied in the "thermally upgraded" version, which is called TU DDP.It is achieved by adding a small quantity of nitrogenous additive.

Electrical grade diamond dotted insulating paper with "B" stage epoxy resin dots.


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