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Diamond Dotted Paper

Quick Details Place of Origin: Zhejiang, China (Mainland) Brand Name: Haotai Model Number: Thermo DDP Type: Insulation Paper Material: electrical paper Application: Low Voltage, layer insulation in LV/HV coil Rated Voltage: 10kv/mm Tensile Strength: ≥160N/10mm(MD); ≥70N/10mm(TD) Color: natural,...

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Quick Details

  • Place of Origin: Zhejiang, China (Mainland)

  • Brand Name: Haotai

  • Model Number: Thermo DDP

  • Type: Insulation Paper

  • Material: electrical paper

  • Application: Low Voltage, layer insulation in LV/HV coil

  • Rated Voltage: 10kv/mm

  • Tensile Strength: ≥160N/10mm(MD); ≥70N/10mm(TD)

  • Color: natural, yellow, red

  • Thickness: 0.05-0.50mm

  • Max Width: 1900mm

  • Product name: epoxy resin coated presspaper


Packaging & Delivery

Packaging Details sealed packing with cardboard protection in roll, sea worthy plywood pallet shipping; 
800kg-1000kg per pallet 
pallet size 1100x1100x1250mm (for width 1000mm coil) 
Conveyance: 10 tons/20ft, 20tons/40HQ(no more than 27tons)
Delivery Time 15-20 days


Product Details

Thermo Established Diamond dotted paper (DPP) for transformer

It is also known as DDP. The use of this B-stage resin coated paper increases the short circuit strength of distribution transformer coils. It is produced by coating modified epoxy resin in diamond dot patterns on electrical insulating paper. The size of the dots are carefully designed to avoid interfering with vacuum drying and oil impregnation. This type of presspaper is treated chemically and included nitrogen content to get a upgraded thermo performance.


Product information
During B-stage, the resin dots are dry and tack free, permitting storage and handling similar to normal presspaper. When the winding is heated for drying purposes, the adhesive dots melt and cure, thus creating permanent bonding sites unaffected by further heating cycles that may occur in service. The bonding strength is adequate to support effective gluing in unsupported coil design. Diamond Dotted Paper can be coated on one or both sides, the customer must specify when they order.

Minimal order quantity: 1 roll
Alternative ordering unit: kg


Product Introduction

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Product Parameters

Features:

• Insulation class A (105 °C) 
• Presspaper (in rolls), 100 % sulphate wood pulp
• High purity and mechanical strength
• Thermosetting coating of expoxi-phenolic resin (B-stage), put in rhombic pattern on one or both sides.
• Good compatibility with transformer impregnants after curing of the coating.
Note: The surfaces to be bonded must remain tightly pressed together during curing


Application:

• Layer insulation in liquid-immersed transformers


Available:

• In rolls. 1000 mm, 1220mm, 1320mm, 1500mm, 1700mm, 1900mm

• In strips minimum width 4 mm
• Available thickness: 0.05 - 1.0 mm (presspaper thickness)

Item

Unit

Value




Nominal Thickness

mm

0.08

0.13

0.17

0.25

Thickness Tolerance

mm

±0.005

±0.007

±0.01

±0.01

Norminal Grammage

g/㎡

80±8

115±11

160±16

240±24

Standard Width

mm

1000mm

Tensile Strength

Lengthwise

Mpa

≥75

Crosswise


≥35

Tear Strength

g

≥50

≥100

≥150

≥300

Breakdown Voltage

KV

≥0.8

≥1.1

≥1.4

≥1.6

Bond Strength

Kpa

≥450

Moisture Content

%

4-8

Curing Temperature and Time

90℃±5℃/3h or 130℃±5℃/6h

Storage Life

month

6 months, room temperature, dry and well-ventilated environment


Product Details Show

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Quality Control

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Universal Testing Machine

Testings for the tensile strength and bonding

Voltage Testing

Testings for the material's breakdown voltage

Chemical lab

Testings of the related chemical elements


Product Processing

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Product Packing

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