Product ParameterProduct DetailsPhenolic cotton cloth laminated tube, referred to as phenolic cotton cloth tube, is a tubular laminated product made of cotton cloth impregnated with phenolic resin and baked by hot rolling. It has high radial tensile strength and can be used as a cage for high-speed bearings. Appearance The inner and outer surfaces of the phenolic cloth tube should be free of edges, and there should be no cracks, layers, or film sandwiched at both ends, and both ends should be cut neatly. Maximum wall thickness: φ50mm Maximum diameter: φ600mm Regular size: 1000mmMaximum wall thickness: φ50mm Maximum diameter: φ600mm Regular size: 1000mmProduct Features| NO. | PROPERTIES | UNIT | STANDARD VALUE |
| 1 | Density | g/cm3 | ≥1.05 |
| 2 | Water absorption rate D-24/23 | % | ≤4.0 |
| 3 | Thermo stability(24h) | ℃ | 130 |
| 4 | Flexural strength | MPa | ≥80 |
| 5 | Compressive strength | MPa | ≥45 |
| 6 | withstand voltage perpendicular to laminations (normal condition air, withstand voltage 5min) 2.0mm in thickness | MV/m | ≥ 3.5 |
| 7 | Volume Resistance Index Under normal conditions In case of humidity | Ω.m | ≥1.0×109 |
| 8 | Surface Resistance Index Under normal conditions In case of humidity | Ω | ≥1.0×109 |