Phenolic Laminated Paper Tube for Transformer

Product Description

What Are Phenolic Laminated Paper Tubes (e.g., 3520)?

These tubes are made by winding insulating paper (like transformer-grade paper) with phenolic resin, then hot-rolling, baking, and curing it into a solid, laminated tube structure. The most commonly referenced standard is the 3520 phenolic laminated paper tube.

Key specifications (typical for 3520 grade):

• Heat resistance: Class E, up to ~120C continuous

• Mechanical strength:

  • Vertical bending strength 90MPa

  • Compressive strength 60MPa

• Dielectric strength:

  • Vertical electrical strength 8kV/mm in transformer oil maintained at 90C

• Dielectric breakdown (parallel layers): 25kV in hot transformer oil

• Dielectric loss factor (50 Hz): 0.03

• Water absorption: 8% at 3mm thickness

• Size range:

  • Inner Diameter: approx. 5 mm to 1,200 mm

  • Wall Thickness: 1 mm

  • Length: approx. 3501,600 mm (custom sizes available)

These tubes are ideal for use as structural insulation in transformers, motors, bushings, and other high-voltage components, especially where exposure to transformer oil is expected.

Does SK Jain Insulations Offer These Tubes?

While SK Jain Insulations clearly offers Bakelite sheets, rods, and tubes (phenolic-based laminates like 3021 and 3025), there's no explicit mention on their website of phenolic laminated paper tubes such as the 3520 grade.

However, they do supply a wide range of industrial and electrical insulation laminates and accessories, including those suitable for transformer applications.

Next Steps: How to Proceed

1. Reach out directly to SK Jain Insulations
   You can contact them via:

   • Phone: +919811010658 / +919811444050

   • Email: skjaininsulations@gmail.com or info@skjaininsulations.com

   • Briefly explain you're seeking phenolic laminated paper tubes (grade 3520 or equivalent) for transformer applications and ask if they can supply or source them.

2. Include relevant specifications to expedite fulfillment:

   • Insulation grade (E-class, 120C)

   • Mechanical and dielectric requirements

   • Estimated dimensions (inner diameter, wall thickness, length)

   • Operating environment (e.g., immersed in transformer oil, temperature range)

3. Ask for supporting documentation:

   • Technical datasheets/certifications (JB/T31721999, IEC, etc.)

   • Samples or small batches for testing, if possible

4. Explore alternative manufacturers if needed:

   • Vendors like those showcased in the image (manufacturing standard 3520 phenolic paper tubes) often provide customization and certificationscould be considered if SK Jain cannot supply them.