Electrical Insulation PressPaper (Kraft Paper) for Transformer

Transformer board/electric insulation presspaper/pressboard

Quick Details

Place of Origin: China (Mainland)                                                            Brand Name: XINCHENG

Product Name: Electrical Insulating Densified PressPaper               Type: Insulation Paper

Usage: Insulation Protection/ oil-immersed power transformer      Insulation class: A (105-℃)

Material: Sulphate Wood Pulp

Application: High Voltage/ High Temperature                                   Rated Voltage: 35kv or above

Tensile Strength: ≥80N/mm2                                                                  Feature: Heat-Resistant

Density: 1.0~1.3g/cm3                                                                               Moisture content: ≤8%

Ash Content: ≤1.0%                                                                                 Oil Absorption: ≥10.0%

pH of aqueous Extract: 6-9

Size: 6400*3200mm; 4400*2260mm or Customized Size

Thickness: 0.05mm-8.0mm; or customized;                                   Width: 625mm-1350mm or customized;

Standard roll width: 1000mm & 1150mm, or customized;

Color: Original pulp color; brown, cyan, red                                     Certification: ISO9001

Standard: IEC 60641 P.4.1.A, JIS C 2305 PB-2, DIN 7733 PSP 3030 & PSP 3055

Sample: Available                                                                                   OEM,ODM service: Available


Transformer board/electric insulation presspaper/pressboard

Product Description

Transformer presspaper is made of high-purity 100% sulphate wood pulp processed by high-pressure processing. This product has high chemical purity and high mechanical strength. After immersion, it has both mechanical and electrical properties.

Press Paper (Kraft paper) is a surface insulation material which is resistant to high voltage and a high capacity for impregnation with transformer oil (dielectric mix of oil-cellulose). Kraft paper is made of 100% sulphate wood pulp. It is a high strength paper with excellent electrical properties. It is generally used by manufacturers to meet their need of insulation with an optimum combination of electrical and mechanical strength, low permittivity and maximum oil absorption.

It is best suited for coil winders, insulation in motors, transformers, manufacturing of laminates etc.

Transformer presspaper is widely used in oil-immersed transformers and reactors, capacitors, switches, etc.


Thin electrical insulation paper is made of 100% kraft pulp. With good electrical and mechanical strength, Which is widely adapted for insulating materials in electrical. electronics, instruments and switches. It also can be used for the 6520 polyester film composite foilbase paper.

-Coil Winding
-Insulation in electrical machines
-Cable covering

Material : 100% non-bleached sulphate coniferous wood pulp from Sweden and Canada .

Transformer Insulation Paper Quality Standard : IEC60641-3-1:2008

Transformer board is widely used in Inductor , Reactor , Power transmission and Transformation equipments . Our transformer board has higher mechanical and electrical strength , higher tensile strength , lower compressibility and bending performance .

Available according to International standards IEC 60641 P.4.1.A, JIS C 2305 PB-2, DIN 7733 PSP 3030 & PSP 3055.


Note: Reels can also be supplied in slitted form duly slitted as per desired width of the customer. Specific thickness can also be supplied as per requirement of the customer.

Transformer board/electric insulation presspaper/pressboard



Unit  Index

Thickness of base paper

mm 0.08 0.13 0.18 0.20 0.25

Density of base paper



One side adhesive thickness



Moisture %


Tensile Strength

MD N/10mm


≥60 ≥110 ≥160 ≥180 ≥230


≥50 ≥70 ≥80 ≥100
Tear Strength MD mN ≥450 ≥900 ≥1,350 ≥1,500


CMD ≥500 ≥1,000 ≥1,500 ≥1,700


Breakdown Voltage

In air


≥0.88 ≥1.37 ≥2.00 ≥2.10


In oil ≥4.4 ≥7 ≥9 ≥9.80 ≥11.50

Welding strength

Room temperature

kpa ≥650



Oil absorption %


Pollution to the transformer oil

                       Free from contamination (tan δ < 0.001)


(1). Q: Can you give me a discount price?

A: It is depending on the volume. The larger the volume is, the more discount you can enjoy.

(2). Q: Why is your price a bit higher than other Chinese suppliers?

A: To meet the requirement of different customers and areas, our factory manufactures various kinds of quality for each item at a wide range of price. We can offer the products of different quality levels depending on customer’s target price and quality requirement.

(3). Q: How can I get a sample?

A: Normally small samples can be sent free of charge and customers just need to bear a little shipping charge, or you can provide your DHL,FEDEX,EMS,UPS courier account number to us. For bigger sizes, it depends.

(4). Q: How can you guarantee the quality of mass production is same with the sample sent to me before?

A: Our warehouse staff will leave another same sample in our company, with your company name marked on it, which our production will be based on.

(5). Q: How can you deal with quality issues that customer feedback after receiving the goods?

1) Customers take photos of unqualified goods and then our sales staff will send them to Engineering Department to verify.

2) If the issue is confirmed, our sales staff will explain the root cause and take corrective actions in coming orders.

3) Finally, we will negotiate with our customers to make some compensation.


Transformer board/electric insulation presspaper/pressboard

Supply Ability:

5000 Ton/Tons per Month


Packaging & Delivery

Transformer board/electric insulation presspaper/pressboard

Packaging Details

  1. Wooden pallet, wooden case, Standard export packing.
  2. According to customer’s requirement.

Port: Qingdao, Tianjin, Shanghai, Ningbo


Lead Time :

Quantity(Kilograms) 1 – 1000 1001 – 10000 10001 – 20000 >20000
Est. Time(days) 7 15 20 To be negotiated


Please Contact Us

Miss: lydia

Mob: 86-13752439076      Fax: 86-22-60863016




WeChat : 86-13752439076   WhatsApp: 86-13752439076

Electrical Insulation PressPaper (Kraft Paper) for Transformer

Electrical Insulation PressPaper (Kraft Paper) for Transformer