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Diamond Dotted Paper

Diamond Dotted Paper

 

Made of Kraft coated with heat curable epoxy resin, the epoxy adhesive is applied to both sides of the paper in a diamond pattern consisting of 9.5mm×9.5mm diamonds with 15.9mm center spacing. 

The Diamond Dotted Paper, also be known as: epoxy adhesive diamond Paper, Diamond Dotted Presspaper, Double sided Diamond Pattern Paper, DDPP, DPRCP, D.D.P, DPP, Diamond Dotted Insulating Paper, Varnished Paper, etc.

Features:

1. It is a kind of chemically inert material, keeping dry and inadherent at normal temperature (below30°C).

2. The Diamond Dotted Paper will make the electric conductor as a hard unit under the high temperature by its internal latency substance.

3. When the temperature rises up to 100°C, the epoxy resin melts and solidifies for once-only time.

4. When to keep the temperature at 100°C for 90 minutes, the epoxy resin would paste on the proximal cable and paper firmly.

5. The bonding strength is as high as to 450kpa at normal temperature.

Application:

It is to be used in oil-immersed transformers for the insulation between coils.


Typical values of Diamond Dotted Paper:

 

Caliper:(inch 

        (millimeter) 

Unit 

0.002 

0.05

0.003

0.08

0.005

0.13

0.007

0.18

0.010

0.25

0.015

0.38

0.020

0.50

Thickness tolerance

%

±10

Width tolerance

mm

±5

Apparent density 

g/cm3

0.75-0.95

0.95-1.05

Moisture content

4.0 - 8.0

PH water extract

 

6.0 - 8.0

Elongation  MD

           CMD

≥2.0

≥5.4

Tear strength  MD

CMD

mN

≥280

≥300

≥450

≥500

≥900

≥1000

≥1350

≥1500

≥2000

≥2300

≥3050

≥3500

≥4000

≥4600

Conductivity of aqueous extract

Ms/m

≤8.0

Ash content

≤0.7

≤1.0

Coating thickness per side

mm

0.006 - 0.012

Tensile strength  MD

              CMD

N/mm2

≥70

≥35

≥80

≥40

Dielectric breakdown (dry test)

volts/layer

≥500

≥750

≥1200

≥1400

≥2100

≥3000

≥3300

Bond strength

Kpa 

≥400

≥450


Note:

 1.All data shown represents nominal or typical values only and should not be considered as minimum or maximum values unless special stated.

2.Thermal upgrade paper with nitrogen content around 1.5% can be provided upon request.

Made of Kraft coated with heat curable epoxy resin, the epoxy adhesive is applied to both sides of the paper in a diamond pattern consisting of 9.5mm×9.5mm diamonds with 15.9mm center spacing

 

The Diamond Dotted Paper, alias such as: epoxy adhesive diamond Paper, Diamond Dotted Presspaper, Double sided Diamond Pattern Paper, DDPP, DPRCP, D.D.P, DPP, Diamond Dotted Insulating Paper, Varnished Paper, etc.
It is to be used in oil-immersed transformers for the insulation between coils. On the insulation layer, there is a layer dotted epoxy resin that will be changed with high temperature change that is to be called as felt.
It is a kind of material with inertia, dry and no conglutination at normal temperature (below30°C),The Diamond Dotted Paper will make the electric conductor forever felt up as a hard unit under the high temperature by its internal latency substance. When the temperature is rising up to 90°C, The Diamond Dotted Paper appears one-off thaw and then one-off solidification. When to keep the temperature at 90°C for 90 minutes, the epoxy resin would paste on neighboring cable and paper safely. The felt intensity is as high as to 70psl at 100°C (The value at least is equal to 0.275Mpa, America standard).