DDP Diamond Dotted Paper

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Made of Electrical Insulation Paper with Diamond Shape Epoxy Resin Dotted in both sides.

Product advantage

Made of Electrical Insulation Paper with Diamond Shape Epoxy Resin Dotted in both sides.
 

  • It is also known as DDP.

  • transformer coils. The use of this B-stage resin coated paper increases the short circuit strength of distribution

  • 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 details

 

• 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

 
C1
Thickness
mm
0.08
0.13
0.17
0.20
0.25
0.30
2
Thickness Tolerance
%
6.5
3
Density
g/cm3
≥0.85
4
Tensile Strength
MD
KN/m
7.5
CD
3.7
5
Tear Strength
m·N
500
1000
1500
2000
6
Dielectric Breakdown
Kv
0.6
0.9
1.2
2.2
2.75
3.3
7
Aqueous Extract
-
6.8~8.5
8
Bond Strength
Kpa
450
9
Ash Content
%
1.0

diamond dotted paper is Wrapped by proctective film; 
diamond dotted paper is Packed by standard import & export cartons or.iron pallets.

 

 

Application:

As interturn insulation for coils of oil-immersed transformers and interlayer insulation of distribution transformers.

Certificate

The insulation system has been approved by UL (NO.: E310670) and the products have passed ROHS test, the company has established
a professional R & D center, and currently has more than 30 kinds of invention patents and utility model patents.
 

FAQ

1.Q: Are you trading company or manufacturer ? 


A: We are a manufacturer, We have more than 32 years experience in producing electrical insulation material.


2.Q: Where is your factory located? How can I visit there? 


A: Our factory is located in Xuchang,Henan provience.


3.Q: Which certification do you have?


A: The plant has passed the certificate of ISO 9001 quality system certification;
The insulation system has been approved by UL;
The products have passed ROHS test.


4.Q: Can i get a samples for free?


A: Of course we can sent you a sample for free, customers just need to pay a litter shipping change.


5.Q: How long is the delivery time?


A: Generally it is 5-15 days if the goods are in stock, or it is 15-30 days.

 

Information needed for insulation material inquiry

It will be better if customer could send us detailed drawing including below information.
1. Insulation material type: insulation paper, wedge, (including DMD,DM, polyester film, PMP,PET, Red Vulcanized Fiber)
2. Insulation material dimension: width, thickness, tolerance.
3. Insulation material thermal class: Class F, Class E, Class B, Class H
4. Insulation material applications
5.. Required quantity: normally its weight
6. Other technical requirement.

Contact Us

 

Company name:Henan Yaan Electric Power Technology Co., Ltd
Sales Department Address:No.1404,14 floor, builiding 5, Henan Electronic Commerce Industrial Park,26 Zhengzhou high tech Industrial Development Zone
Factory address:West Industrial Parks, Weidu District, Xuchang, Henan 461000,China
Phone:400-7707-168 0371-55572250/60 19937611577 
E-mail:info15(at)xcyaan.com
Fax: 0371-55626022
Whatsapp: 19937611577

  • DDP/Diamond dotted paper is a thermally upgraded kraft paper and used in oilfilled transformer for layer to layer insulation between the coils. 
  • The kraft paper has high tensile and tear strength. The Bstage epoxy resin, which cures during the processing, forms a high strength bond.  
  • This bond prevents the windings from moving during operation or under short circuit stresses.  
  • The diamond pattern epoxy resin treatment improves the temperature resistance and thermal performance of the kraft paper.  
  • The combination of high kraft paper strength and high epoxy resin bond strength gives the greater strength and coil integrity throughout the life of the transformer. 

 

  •  Diamond dotted paper (DDP) is also referred as diamond pattern paper, diamond pattern resin coated paper, epoxy adhesive diamond paper, diamond coated kraft paper, diamond dotted insulating paper, varnished paper, etc.  
 
  • The thickness and width can be made according to customer’s specifications.  The standard color, thicknesses, and roll widths are:

         

  • Color: Natural Brown
  • Thickness (mm): 0.08, 0.13, 0.18, 0.25, 0.38, and 0.50
  • Thickness (inch): 0.003, 0.005, 0.007, 0.010, 0.015, and 0.020
  • Width (mm): 500, 625, 810, 960, 1000, 1050, 1100, and 1219
  • Width (inch): 20, 25, 32, 38, 39, 41, 43, and 48