3520 Phenolic Laminated Paper Tube（PFCP21）
3520 Phenolic Laminated Paper Tube;
Specifications: Inner diameter minimum 15-500mm;
Wall thickness: 3mm-30mm
Product Introduction: 3520 phenolic composite paper tube is a thermosetting phenolic composite paper tube made of insulating paper roll as base material and phenolic resin as adhesive, which is cured by hot rolling and baking.
Product Application: (Standard: JB/T3172-1999)
• Transformer: Used as a structural component such as an insulation frame, support, and bushing, especially suitable for the interior of oil-immersed transformers. <sup>13</sup>
• Electric motors and generators: Used for winding insulation, slot wedges, lead supports, and other insulation structures. <sup>26</sup>
• High-voltage switchgear: used as insulating partitions, support rods, or bushing assemblies. <sup>15</sup>
Capacitors and transformers: used as internal insulating isolation elements. <sup>13</sup>
• Power testing equipment: such as high-voltage test benches, phase comparators and other supporting insulation components.
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Serial Number
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Indicator Name
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unit
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Index value
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|||
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3520
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3526
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|||||
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Inner diameter 5-25 mm
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Inner diameter 25 mm or more
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|||||
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1
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appearance
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——
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The surface is smooth, free of bubbles, wrinkles, cracks, obvious wear and overheating marks, and the end face is neatly cut.
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|||
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2
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Water absorption rate
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%
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10-3
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——
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≤4
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3
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density
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克/立方厘米
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≥1.03
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≥1.10
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≥1.20
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4
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Thermal stability (24 hours)
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℃
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120
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120
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130
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5
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Bending strength
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Megapascal
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≥50
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≥60
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≥80
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6
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compressive strength
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Megapascal
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≥50
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≥60
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≥140 (axial)
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7
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Dielectric loss factor (50Hz)
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——
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≤0.03
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≤0.03
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8
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Vertical layer withstand voltage (5 minutes in transformer oil at 90±2°C)
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1.5-2.5 mm
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MV/m
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≥8.5
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≥8.5
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≥14
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2.51-3.5 mm
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≥8.0
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≥8.0
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≥12
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3.5-4.5 mm
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≥7.0
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≥7.0
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≥8
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4.5-6 mm
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≥6.5
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≥6.5
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≥6
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9
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Parallel layer withstand voltage (90±2℃ transformer oil, for 5 minutes)
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KV
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20
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25
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10
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Surface withstand voltage (after being exposed to normal air for 1 minute after being exposed to moisture).
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KV
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12
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12
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Our core strengths
✔ Over 20 years of processing experience – Experienced technicians ensure precision and consistency
✔ CAD Design Support – Provides customized drawings and rapid engineering response
✔ Flexible thickness (3-80mm) – Fully customizable to meet various application needs
✔ SGS Certified Quality – Reliable and Internationally Verified Materials
✔ Premium raw materials – superior performance and durability
✔ Factory direct supply – lower costs, faster communication, no middlemen
Get in Touch with Us
Contact us for insulation materials, engineering plastics, or drawing-based custom machining services.
Our team is ready to provide technical advice and fast quotations to support your project.
Get in Touch with Us
Contact us for insulation materials, engineering plastics, or drawing-based custom machining services.
Our team is ready to provide technical advice and fast quotations to support your project.
