Made from 100% unbleached high-purity sulfate softwood pulp, low ash content, free of glue and fillers, preventing conductive impurities from affecting insulation.Produced through free beating and wet forming, then precisely creped mechanically, with crepe rate typically ≥50%, balancing flexibility and strength.Standard heat resistance class: 105℃, suitable for long-term immersion in transformer oil.
Core Properties
Electrical Properties: Power frequency breakdown voltage ≥ 950V per layer, high dielectric strength, effectively suppresses partial discharge; low dielectric loss, low operating loss.
Oil Absorption & Compatibility: Excellent compatibility with mineral insulating oil. Forms a dense composite insulation after oil absorption without expansion or deformation.
Mechanical Flexibility: Tensile strength ≥ 1.96 kN/m (longitudinal), ≥ 1.3 kN/m (transverse). Fits conductors tightly, withstands repeated thermal expansion and contraction of coils, not easy to break when bent.
Chemical Stability: Ash content ≤ 0.7%, extremely low chloride and sulfate ions, resistant to aging and harmful substance precipitation in oil for long service.
Main Applications
Inter-turn and layer insulation of windings, covering for transposed conductors, end insulation of windings.
Wrapping for leads and bushing roots.
Forms a “paper-oil” composite insulation system with insulating oil, widely used in power / distribution transformers, instrument transformers, reactors.
Semi-conductive crepe paper is also used for electric field grading in instrument transformers.
Common Specifications & Standards
Thickness: 0.35–0.8 mm, weight: 60–120 g/m².
Complies with electrical industry standards (e.g. GB/T 1981.2, IEC 60641), with strict requirements for dielectric strength, tensile strength, ash content and moisture content.
Can be slit into rolls of different widths and customized in size.
Selection & Value
Select thickness, crepe rate and tensile strength according to transformer voltage class, oil temperature and mechanical stress.
High-quality crepe paper significantly reduces partial discharge and insulation aging risks, extends transformer service life (from 15 years to 25+ years in some cases), acting as a “safety barrier” for high-voltage equipment.
