EPB18 Plastic Plain Bearings

CSB Plastic is one of the leading China epb18 plastic plain bearings manufacturers and suppliers,Website:http://www.csbbearings.com, and also a professional epb18 plastic plain bearings factory and company, we are always at your services.EPB18 Plastic Plain Bearings● A self-lubricating material with low water absorbtion. Good wear resistance will be maintained when used with soft shaft and hard shaft combined.● Continuous working temperature: -50℃～110℃;● Maintenance-free dry operation;● High load requirement;● Suitable for working in humid environment.The Material Data SheetTypical ItemStandardUnitCSB-EPB18   DensityISO1183g/cm³1.45   ColorLight Green   Dynamic friction /steel(dry)0.05-0.18   Max. PV (dry)N/mm²×m/s0.8   Max. roatating velocitym/s1.2   Max. oscillating velocitym/s0.8   Max. linear velocitym/s3.0   Tensile strengthISO527MPa90   Compressive strength (Axial)MPa70   E-moduleISO527MPa2700   Max. static pressure of the surface, 20℃MPa70  Shore hardnessISO868D75   Continuous work temperature℃-50/110   Short-time work temperature℃-50/170   Thermal conductivityASTME1461W/m×k0.3   Linear coef. of thermal expansionASTMD696K-1×10-58   Moisture absorption RH50/23℃ASTMD570%0.2   Max. water absorption, 23℃%0.5   FlammabilityUL94HB   Volume resistivityIEC60093Ωcm>1015   Surface resistivityIEC60093Ω>1015PV Value of BearingsThe max PV value of the CSB-EPB18 series bearing is 0.8N/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 EPB18-1).The Relation of Load, Speed and TemperatureCSB-EPB18 allows the Max static load of 70Mpa, The max compressive deformation rate under the max load is listed in Graph EPB18-2, The actual load capacity of bearing is slightly less than 70Mpa, The bearing load is variable against the speed and temperature, Fast speed (Vmax: 1.20m/s) results into higher temperature (Tmax: 110℃) which decreases the load capacity of the bearing. Please refer to the Graph EPB18-3 for such variation.The Friction Factor,Wearing and shaft materialFriction Factor  Graph EPB18-4 shows that as the same as most of the slide bearing materials, the friction factor of CSB-EPB18 is increasing along with the rotation speed under a certain loading while as shown in figure EPB18-5, it is decreased along with the increasing of loading when the operation speed is stable. From figure EPB18-6, it is found that the most suitable shaft roughness is Ra0.2 to Ra0.6. Smoother shaft or rougher shaft may result into friction factor increasing.CSB-EPB18DryGreaseOilWaterFriction coef. μ0.05~0.250.090.040.04Wearing and shaft materialGraph EPB18-7 shows the wearing is considerably affected by the shaft materials. Heat-treated steel shaft and carbon steel shaft is good for this bearing material. Graph EPB18-8 tells that CSB-EPB18 is suitable for hardened chrome steel and hardened steel shaft in rotation operation or oscillation operation.Chemical ResistanceCSB-EPB18 is good at chemical resistance against weak acidic medium and various kinds of lubricants.Water AbsorbabilityThe water absorb rate of CSB-EPB18 is 0.2% under the atmospheric pressure while it is 0.5% 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 CSBEPB18 after long period of exposing under the UV ray and therefore the performance of the material will be reduced.Bearing InstallationCSB-EPB18 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