Phenolic laminated paper tube

Ningbo Dongqianhu Solid Insulating Products Factory phenolic with kraft Laminated paper tube 1. definition and purpose With highly electricity function ,phenolic insulating laminated paper tube was made of the insulating paper mix into phenolic resin,which formed after heated and solidified .This can be parts of insulating structure used in the electrical equipment as well as in the transformer oil. 2 .technical requirement 2.1 (Appearance) The appearance should be clean,without disfigurement such as crackle,air bubble. Inside wall allowed to a light wrinkle,air bubble and mould track which are not affect vertical level voltage.The face should orderly cut.There is allowing to the wrinkle when the wall thickness over 13mm. 2.2 Mainly function index 1 (function index) No. item unit Test method index (ID) 5mm ∼ 25mm 25mm above(over)25mm 1 density g/cm 3 GB/T5132 ≥1.03 ≥1.10 2 absorbing water rate % GB/T5132 - ref form 2 3 24h heat stability(24h) JB/T3172 120 120 4 Anti-Bent Intensity N/mm 2 JB/T3172 ≥50.0 ≥60.0 5 Anti-press Intensity N/mm 2 GB/T5132 ≥50.0 ≥60.0 6 50Hz (hours) Element of medium waste - GB/T3172 ≤0.03 ≤0.03 7 On the vertical level the voltage can endure 5mins under 92+/-2temperature transformer 5min (wall thichness 1.5mm ∼ 2.5mm 2.5mm ∼ 3.5mm 3.5mm ∼ 4.5mm 4.5mm ∼ 6.0mm 6.0mm ∼ 9.0mm KV/mm GB/T1408.1 JB/T3172 by 5.11 item ≥8.5 ≥8.0 ≥7.0 ≥6.5 ≥6.0 ≥8.5 ≥8.0 ≥7.0 ≥6.5 ≥6.0 8 On the parallel level the voltage can endure 5 mins under 92+/-2 temperature transformer KV GB/T5132 JB/T3172 by 5.12 item 20 25 9 After the voltage became wet the surface,which can endure 1 min under normal air KV GB/T5132 JB/T3172 by 5.13 item 12 12 2 absorbing water index wall thickness(mm) 1.5 3 5 7 10 13 absorbing water rate(%) 10 8 6 5 4 3