EPB20 Plastic Plain Bearings

CSB Plastic is one of the leading China epb20 plastic plain bearings manufacturers and suppliers,Website:http://www.csbbearings.com, and also a professional epb20 plastic plain bearings factory and company, we are always at your services.EPB20 Plastic Plain Bearings● A self-lubricating material for applications in water. It is suitable for high speed motion under low load.● Continuous working temperature: -50℃～90℃;● Suitable for medium load operation;● For underwater operation;● For high speed movement;The Material Data SheetTypical ItemStandardUnitCSB-EPB20   DensityISO1183g/cm³1.52   ColorBlack   Dynamic friction /steel(dry)0.15-0.35   Max. PV (dry)N/mm²×m/s0.15   Max. roatating velocitym/s0.50   Max. oscillating velocitym/s0.40   Max. linear velocitym/s2.00   Tensile strengthISO527MPa90   Compressive strength (Axial)MPa70   E-moduleISO527MPa9500   Max. static pressure of the surface, 20℃MPa40  Shore hardnessISO868D78   Continuous work temperature℃-50/90   Short-time work temperature℃-50/110   Thermal conductivityASTME1461W/m×k0.6   Linear coef. of thermal expansionASTMD696K-1×10-56   Moisture absorption RH50/23℃ASTMD570%0.2   Max. water absorption, 23℃%0.8   FlammabilityUL94HB   Volume resistivityIEC60093Ωcm>105   Surface resistivityIEC60093Ω>105PV Value of BearingsThe max PV value of the CSB-EPB20 series bearing is 0.15N/mm2*m/s which determines the load capacity of bearing is inversely proportional to the speed. Please refer to the chart for more detailed information (Graph EPB20-1).The Relation of Load, Speed and TemperatureCSB-EPB20 allows the Max static load of 40Mpa, The max compressive deformation rate under the max load is listed in Graph EPB20-2, The actual load capacity of bearing is slightly less than 40Mpa, The bearing load is variable against the speed and temperature, Fast speed (Vmax: 0.5m/s) results into higher temperature (Tmax: 90℃) which decreases the load capacity of the bearing. Please refer to the Graph EPB20-3 for such variation.The Friction Factor,Wearing and shaft materialFriction Factor  Similar with most of the plastic bearings, the friction factor of CSB-EPB20 is increased along with the operation speed when the loading is stable (see Graph EPB20-4) and is decreased along with the loading increasing when the operation speed is stable (see Graph EPB20-5). From Graph EPB20-6, it shows the friction factor of CSB-EPB20 is variable against different shaft surface roughness. The recommended shaft surface roughness is Ra0.3~0.6.CSB-EPB20DryGreaseOilWaterFriction coef. μ0.07~0.200.090.040.04Wearing and shaft materialGraph EPB20-7 shows that CSB-EPB20 is rather suitable for hardened steel shaft and hardened chrome steel shaft under lower loading andGraph EPB20-7 shows that CSBEPB20 wearing feature is better for oscillation operation than of rotation operation.Chemical ResistanceCSB-EPB20 is good at chemical resistance against weak acidic medium and various kinds of lubricants.Water AbsorbabilityThe water absorb rate of CSB-EPB20 is 0.2% under the atmospheric pressure while it is 0.4% when the material is immerged into water. With its low water absorbability, the material is suitable for humid environment applications.UV ResistanceDisintegration could be possible for the material CSBEPB20 after long period of exposing under the UV ray and therefore the performance of the material will be reduced.Bearing InstallationCSB-EPB20 The Interfit ToleranceDiameter mmTolerance after fit E10Fit Housing H7Fit Shaft h9>0～3+0.014～+0.0540～+0.0100～-0.025>3～6+0.020～+0.0680～+0.0120～-0.030>6～10+0.025～+0.0830～+0.0150～-0.036>10～18+0.032～+0.1020～+0.0180～-0.043>18～30+0.040～+0.1240～+0.0210～-0.052>30～50+0.050～+0.1500～+0.0250～-0.062>50～80+0.060～+0.1800～+0.0300～-0.074>80～120+0.072～+0.2120～+0.0350～-0.087>120～180+0.085～+0.2450～+0.0400～-0.100