Description
Crepe paper tubes are high-performance insulation solutions designed for transformer windings and leads, providing reliable mechanical and dielectric properties in oil-immersed electrical systems.
Detailed Introduction
Crepe paper tube insulation is manufactured by spirally winding creped electrical-grade paper to form a tube, ensuring maximum oil absorption and high flexibility. The creping increases stretchability and mechanical strength, allowing these tubes to conform to intricate winding configurations and provide consistent insulation. Commonly offered in customizable lengths and diameters, crepe paper tubes support efficient transformer operation by retaining more oil and lowering winding temperatures.
Crepe paper tubes possess:
-
High stretch ability (up to 50% in both directions).
-
Superior dielectric strength due to oil retention.
-
Bendability and mechanical resistance, even under high stress.
-
Compliance with Class A insulation (105°C) and key IEC standards for transformer insulation.
Data Table: Common Specifications
|
NINGBO SIDA NEW MATERIAL TRADE CO.,LTD OMEN INDUSTRIAL CO.,LTD |
|||
|
Test Report |
|||
|
Product name: crepe paper tube Thickness:4*6*1000mm Test Date:25th,Oct,2025 |
|||
|
Item |
Unit |
Standard requirement |
Test result |
|
Paper Appearance (Expanded) |
— |
No pinholes, sand grains and other defects on the paper surface, the texture is clear |
/ |
|
Elongation |
mm |
40-50% |
45 |
|
Base paper thickness |
mm |
0.35±0.05 |
0.34 |
|
Density |
g/㎡ |
65±10% |
66 |
|
Power frequency breakdown voltage (sheet in air) |
V≥ |
800 |
900 |
|
Power frequency breakdown voltage (in transformer oil by model) |
KV≥ |
30 |
30 |
|
Tension resistance ≥ |
N/15mm |
22 |
26 |
|
No |
Item |
Unit |
Requirement |
|
1 |
ID（D1） |
mm |
3-100 |
|
2 |
Inner diameter tolerance |
mm |
±0.05 |
|
3 |
Tube thickness(S) |
mm |
1-6 |
|
4 |
OD(D2) |
mm |
D1＋2S |
|
5 |
Outer diameter tolerance |
mm |
0.5 |
|
6 |
Length |
mm |
1000–2000 |
|
7 |
Length tolerance |
mm |
+10 |
|
8 |
Breakdown voltage in oil |
KV |
15(S=1) |
|
20(S=1.5) |
|||
|
30(S≧2) |
|||
|
35(S≧3) |
|||
|
NINGBO SIDA NEW MATERIAL CO.,LTD OMEN INDUSTRIAL CO.,LTD |
|||
|
Test |
Report |
||
|
Product name: crepe paper tube Thickness:8*12*1000mm Test Date:25th,Oct,2025 |
|||
|
Item |
Unit |
Standard requirement |
Test result |
|
Paper Appearance (Expanded) |
— |
No pinholes, sand grains and other defects on the paper surface, the texture is clear |
/ |
|
Elongation |
mm |
40-50% |
45 |
|
Base paper thickness |
mm |
0.35±0.05 |
0.34 |
|
Density |
g/㎡ |
65±10% |
66 |
|
Power frequency breakdown voltage (sheet in air) |
V≥ |
800 |
900 |
|
Power frequency breakdown voltage (in transformer oil by model) |
KV≥ |
30 |
31 |
|
Tension resistance ≥ |
N/15mm |
22 |
26 |
|
No |
Item |
Unit |
Requirement |
|
1 |
ID（D1） |
mm |
3-100 |
|
2 |
Inner diameter |
mm |
±0.05 |
|
3 |
Tube thickness(S) |
mm |
1-6 |
|
4 |
OD(D2) |
mm |
D1＋2S |
|
5 |
Outer diameter |
mm |
0.5 |
|
6 |
Length |
mm |
1000–2000 |
|
7 |
Length tolerance |
mm |
+10 |
|
8 |
Breakdown voltage in oil |
KV |
15(S=1) |
|
20(S=1.5) |
|||
|
30(S≧2) |
|||
|
35(S≧3) |
|||
|
NINGBO SIDA NEW MATERIAL CO.,LTD OMEN INDUSTRIAL CO.,LTD |
|||
|
Test Report |
|||
|
Product name: crepe paper tube Thickness:16*19*1000mm Test Date:25th,Oct,2025 |
|||
|
Item |
Unit |
Standard requirement |
Test result |
|
Paper Appearance (Expanded) |
— |
No pinholes, sand grains and other defects on the paper surface, the texture is clear |
/ |
|
Elongation |
mm |
40-50% |
45 |
|
Base paper thickness |
mm |
0.35±0.05 |
0.34 |
|
Density |
g/㎡ |
65±10% |
66 |
|
Power frequency breakdown voltage (sheet in air) |
V≥ |
800 |
900 |
|
Power frequency breakdown voltage (in transformer oil by model) |
KV≥ |
30 |
31 |
|
Tension resistance ≥ |
N/15mm |
22 |
26 |
|
No |
Item |
Unit |
Requirement |
|
1 |
ID（D1） |
mm |
3-100 |
|
2 |
Inner diameter tolerance |
mm |
±0.05 |
|
3 |
Tube thickness(S) |
mm |
1-6 |
|
4 |
OD(D2) |
mm |
D1＋2S |
|
5 |
Outer diameter tolerance |
mm |
0.5 |
|
6 |
Length |
mm |
1000–2000 |
|
7 |
Length tolerance |
mm |
+10 |
|
8 |
Breakdown voltage in oil |
KV |
15(S=1) |
|
20(S=1.5) |
|||
|
30(S≧2) |
|||
|
35(S≧3) |
|||
Note:The product specifications provided are for reference purposes only. Please refer to the actual product for final specifications. We also offer various sizes and thicknesses to meet your specific needs. For further customization, please contact us.
Application Scenarios
-
Oil-immersed power transformers (internal lead and winding insulation).
-
Distribution transformers.
-
Instrument transformers (CT, CVT types).
-
Electrical machinery requiring flexible insulation for leads and windings.
-
Custom insulation projects for irregular shapes.
FAQs
Q: What are the main benefits of crepe paper tube insulation for transformers?
-
A: Superior oil retention, enhanced dielectric strength, bendability without collapse, and high mechanical flexibility.
Q: Can crepe paper tubes be customized for length and diameter?
-
A: Yes, most manufacturers offer custom sizes to match specific applications and winding requirements.
Q: What international standards do crepe paper tubes comply with?
-
A: IEC 60626 (insulation paper), UL, RoHS, and REACH for environmental and safety compliance.
Q: Is class A insulation suitable for standard transformer operations?
-
A: Yes, Class A (105°C) insulation is ideal for most transformer environments; higher temperature classes are available for demanding applications.
Testing Standards & Certification
Crepe paper tube insulation products generally adhere to IEC 60626 standards for composite insulating materials, with options meeting UL, RoHS, and REACH certification for quality and safety. Consistent mechanical, dielectric, and thermal properties are verified through rigorous testing.