Laminated Tube The Phenolic bonded paper laminated tube V3520 is made by the paper of pure wood purl, which is coiled as basal material with phenolic resin as adhesive, then to be reeled and hot-pressed at high temperature, and finally cured to thermoset phenolic laminated tube. The Epoxy glass cloth laminated tube V3641 is made by the electrical non-alkali fiberglass cloth as basal material with epoxy resin as adhesive,then to be reeled and pressed at high temperature ,and finally be cured to tube.
Type
Type
Name
Characteristics & Application
V3520
Phenolic bonded paper laminated tube
Its thermal class is E, with higher dielectric property at dry conditions, used as insulating structural parts at dry conditions or in transformer oil for electrical equipments
V3641
Epoxy glass cloth laminated tube
The thermal class is B, with tight structure, low water absorption, high mechanical and electrical properties. Used as insulating structural parts for electrical apparatus.
Technical requirements
No.
Name
Unit
Value
V3520
V3641
1
Density
g/cm3
≥1.03～0.10
≥1.7
2
Compressive strength
MPa
≥50～60
≥138axial
3
Shear strength
MPa
－
≥14.7
4
Flexural strength
MPa
≥50～60
－
5
Water absorption
％
≤3～10
0.4～1.0
6
Voltage resistance perpendicular to layer at 90℃±2℃ in transformer oil for 5min.
MV/m
6~8.5
－
7
Voltage resistance parallel to layer at 90℃±2℃ in transformer oil for 5min.
