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Diamond Dotted Paper

Diamond Dotted Paper

Product introduction

Diamond dotted paper DDP product description:

Diamond dotted paper DDP is made of insulation paper coated by modified epoxy resin in the shape of rhombus.

In the process of coil drying, the agglutinating and solidifying of DDP can bond the coil into a fixed unit.

The bonding strength of epoxy resin is sufficient to prevent the displacement of the various layers of the winding in short circuit condition and further ensure the long-term mechanical and electrical properties of insulation structure.

Diamond dotted paper DDP production video:

Diamond dotted paper DDP parameter:

Standard: JB / T1004.3-2004 Diamond dotted paper(DDP)
Project Unit 0.08 0.13 0.18 0.2 0.25
Thickness & Tolerance mm 0.080 ±0.005 0.130 ±0.007 0.180 ±0.010 0.200
0.250 ±0.010
Density g/m2 0.85-1.1
Moisture Content % 4.0-8.0
Water Extraction PH 6.5-8.5
Ash Content % ≤1.0
Adhesive Thickness µm 6-12
Oil Absorbency % ≥20
Contamination to Transformer Oil No Contamination
Bond Strength Normal KPa ≥650
100℃±2℃ ≥400
Tensile Strength MD N/10mm ≥60 ≥110 ≥160 ≥180 ≥230
CD ≥30 ≥50 ≥70 ≥80 ≥100
Elongation MD % ≥2.0
CD ≥4.0
Tear Strength MD MN ≥450 ≥900 ≥1350 ≥1500 ≥2000
CD ≥500 ≥1000 ≥1500 ≥1700 ≥2300
Breakdown Voltage In the air KV ≥0.8 ≥1.37 ≥2.00 ≥2.10 ≥2.25
In the oil ≥4.00 ≥7.00 ≥9.00 ≥9.80 ≥11.50


Thickness(mm) Width(mm)
0.08 1000 1070 1120 1200 1220 1320 1900
0.13 1000 1100 1120 1200 1220 1320 1920
0.18 1000 1100 1200 1210 1990
0.25 980 1000 1100 1200 1220 1450 1990
0.38 1000 1000 1200 1990

Note:The data in the above table only represents typical or average data, just for reference in practical application. It does not bear any responsibility for the use of the product or related legal liability.

Diamond dotted paper DDP application:


Diamond dotted paper DDP are widely used in the interlayer insulation and turn-to-turn insulation of oil-immersed power transformers.

Insulation paper diamond dotted DDP

When used, the coating layer begins to melt at a certain temperature during the drying process, causing adhesion, and begins to solidify as the temperature rises.

Adjacent layers of the winding are reliably bonded into a fixed unit. The bonding strength of the epoxy resin is sufficient to prevent the displacement of the layers of the winding during the short circuit, thereby ensuring the electrical and mechanical properties of the insulating structure.

Insulation paper

Since the resin coating of the rhombic dispensing paper is spotted, the immersion of the oil and the discharge of gas in the insulating material are ensured, and the corona and partial discharge are effectively avoided, thereby ensuring the safety and reliability of the insulating structure.

It can also be used as a cable shielding isolation layer and an anti-corona material for high-voltage motors and electrical appliances.

Diamond dotted paper DDP product features:

– insulation class A according to IEC 641

– kraft paper, 100% sulphate pulp

– high purity and mechnical sttength

– baked enamel coating: epoxy resin, rhombic, one or both side

– good compatibility with liquid dielectic after the baked enamel coating has hardened

– take care of the layers

Insulation paper DDP

Diamond dotted paper DDP product display:

Diamond dotted insulation paper DDP is made of electrical insulating paper 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 x 9.5mm diamonds with 15.9mm center spacing.

It is a kind of material with inertia, dry and no conglutination at normal temperature (below 30 degree C).

Insulation paper DDP

Diamond dotted insulation paper DDP 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 degree C.

The Diamond Paper begins one-off thaw and then one-off solidification .

When to keep the temperature at 90 degree C for 90 minutes, the epoxy resin would paste on neighboring cable and paper safely. The felt intensity is as high as to 70psi at 100 degree C (The value at least is equal to 0.275Mpa, America standard)

Diamond dotted paper DDP packing and shipping:

Our Diamond dotted insulation paper DDP are exported to all over the world.

Packed in plastic bag and corrugated paper; store at room temperature; avoid sunlight, moisture and fire. The storage period is 12 months.

We use multi-layer composite packaging (film, wrapping paper) to effectively reduce the probability of damage and dampness during transportation!

Diamond dotted paper DDP FAQ:

Q: Are you trading company or manufacturer ?

A: We are a manufacturer, We have more than 61 years experience in producing insulation materials.

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

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

Q: Which Diamond dotted paper DDP 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.

Q: Can I get samples for free?

A: Of course, we can sent you for free samples, you just need to pay shipping.

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.

Insulation paper diamond dotted DDP

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