High-Strength Electrical Insulating Crepe Paper Tubes for Transformers & Electrical Cable Sleeves
Our Premium Crepe Paper Insulation Tubes are manufactured from high-purity electrical kraft insulating paper through a precise micro-creping process. Specifically designed for critical insulation applications in oil-immersed transformers, mutual inductors, and reactors, these tubes provide exceptional mechanical flexibility and high-voltage dielectric protection. The unique crepe structure significantly increases the surface area, facilitating rapid and complete impregnation of insulating oils to eliminate partial discharge risks.
Key Features & Advantages
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Superior Elasticity & Elongation: With an elongation rate of 100% to 140% (measured: 127.9%), these tubes can bend and adapt easily to complex lead wiring layouts without cracking or tearing.
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Excellent Dielectric Properties: Boasts a reliable breakdown strength (average ≥ 1.10 kV, measured: 1.29 kV) to withstand extreme electrical stress inside high-voltage machinery.
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Optimized Oil Absorption: The micro-protuberance profile (31 numbers/inch) creates highly porous capillary pathways, allowing rapid transformer oil penetration for optimal insulation stability.
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Low Ash & Moisture: Highly purified chemical processing ensures an ultra-low ash content (≤ 0.7%) and minimal moisture (≤ 8.0%), minimizing the risk of long-term insulation degradation.
Industry Applications
These tubes are extensively utilized across the heavy electrical manufacturing sector:
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Transformers: Lead insulation for high/low voltage coils, tap changers, and outleads in oil-immersed transformers.
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Instrument Transformers: Internal core-to-terminal routing and shielding insulation.
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High-Voltage Cable Joints: Protective structural insulating sleeves for outdoor and indoor cable terminations.
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Reactors & Capacitors: General insulating barrier and phase-to-phase lining.
Technical Datasheet
| Property / Parameter | Standard Limit | Measured Value |
| Description | - | CREPE PAPER 0.46mm |
| Size Range | 4.0 mm – 130.0 mm | Conforms (4-130mm) |
| Thickness | 0.4 ~ 0.5 mm | 0.476 mm |
| Basis Weight | - | 127.2 g/m² |
| Density | 0.20 ~ 0.35 g/cm³ | 0.27 g/cm³ |
| Tension Strength | MD ≥ 4.0 kg/15mm | 6.1 kg/15mm |
| Elongation | 100% ~ 140% | 127.90% |
| Dielectric Breakdown Strength | Ave ≥ 1.10 kV / Min ≥ 0.80 kV | AVG 1.29 kV / Min 1.21 kV |
| Moisture Content | ≤ 8.0% | 5.1% |
| Ash Content | ≤ 0.7% | 0.329% |
| Protuberances / Crepe Count | 20 ~ 40 Numbers/Inch | 31 Numbers/Inch |