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Insulation paper（cable paper / insulating kraft paper)
Standard: IEC 60554-3-1,Q/JLLS 20471-2020,GB 7969-2003
Regular Width: 1000mm/1200mm
Thickness: 50µm, 80µm, 130µm, 150µm, 180µm,200µm,,250µm
Thermal rating: Class A(105℃)
Color: natural
Application: oil-immersed transformers，Wire wrap insulation，Current & instrument transformers
Insulation paper（kraft paper) is a type of paper made from softwood pulp by the sulphate method. It is widely used for high-voltage electrical appliances such ashigh-voltage cables, signal cables, electromagnetic wires, transformers, inductors, and reactors.
Excellent Electrical Insulation Performance: High dielectric strength and low dielectric loss, suitable for medium and high voltage applications
Good Mechanical Properties: High tensile strength and flexibility, ideal for winding and processing
High Purity and Stability: Made from premium insulating wood pulp with low impurity content, ensuring stable long-term performance
Excellent Absorption and Impregnation: Effectively absorbs transformer oil, enhancing overall insulation and heat dissipation
Thermal Resistance: Suitable for normal operating temperatures in oil-immersed equipment (typically Class A insulation)
Insulation paper（kraft paper)is widely used in HV cable, signal cable, electromagnetic wire, transformer, mutual inductor, electrical reactor, etc.
1.Factory: We operate a professional electrical insulation materials manufacturing facility and are ISO-certified.
2.Fully Automated Production: Our advanced automated workshop is supported by a strict and comprehensive quality management system.
3.Quality Inspection: Equipped with four major laboratories and five core product performance testing capabilities.
4.Processing Services: We provide customized processing solutions based on your requirements, ensuring high quality and on-time delivery.
5.Product Certification: Our products comply with UL, SGS, RoHS, and REACH standards. Sample testing is available upon request.
6.Ready Stock Supply: Standard products can be delivered within 7–15 days.
Our company is certified to ISO 9001, ISO 14001, and ISO 45001 management systems. Our products also comply with international certifications and reports including UL, RoHS, REACH, MSDS, CEMT, as well as factory inspection and test reports provided before shipment.
| Properties | Item | Unit | values | |||||
| MAIN CHARACTERISTICS | Thickness | μm | 50 | 80 | 130 | 180 | 200 | 250 |
| Tolerance | % | ±10 | ±10 | ±10 | ±10 | ±10 | ±10 | |
| Tightness | g/cm³ | ≥0.9 | ≥0.9 | ≥0.9 | ≥0.9 | ≥0.9 | ≥0.9 | |
| Air permeability | ml/min | ≤35 | ≤35 | ≤35 | ≤35 | ≤35 | ≤35 | |
| Ash content | % | ≤0.7 | ≤0.7 | ≤0.7 | ≤0.7 | ≤0.7 | ≤0.7 | |
| Moisture content | % | 6.0-9.0 | 6.0-9.0 | 6.0-9.0 | 6.0-9.0 | 6.0-9.0 | 6.0-9.0 | |
| Smoothness | s | ≥30 | ≥30 | ≥30 | ≥30 | ≥30 | ≥30 | |
| MECHANICAL CHARACTERISTICS | Tensile strength (MD) | MPa | ≥70 | ≥70 | ≥75 | ≥75 | ≥75 | ≥75 |
| Tensile strength (CMD) | MPa | ≥35 | ≥35 | ≥35 | ≥35 | ≥35 | ≥35 | |
| Elongation (MD) | % | ≥2.0 | ≥2.0 | ≥2.0 | ≥2.0 | ≥2.0 | ≥2.0 | |
| Elongation (CMD) | % | ≥4.0 | ≥4.0 | ≥4.0 | ≥4.0 | ≥4.0 | ≥4.0 | |
| Shrinkage (MD) | % | ≤1 | ≤1 | ≤1 | ≤1 | ≤1 | ≤1 | |
| Shrinkage (CMD) | % | ≤1.5 | ≤1.5 | ≤1.5 | ≤1.5 | ≤1.5 | ≤1.5 | |
| Tear strength | mN | ≥300 | ≥500 | ≥1020 | ≥1390 | ≥1700 | ≥2300 | |
| ELECTRICAL DATA | Electric strength in air | kV/mm | ≥9 | ≥9 | ≥9 | ≥9 | ≥9 | ≥9 |
| Conductivity of aqueous extract | mS/m | ≤8 | ≤8 | ≤8 | ≤8 | ≤8 | ≤8 | |
| Electric strength in oil | kV/mm | ≥50 | ≥50 | ≥50 | ≥50 | ≥50 | ≥50 | |
