EPB21 Plastic Plain Bearings

CSB Plastic is one of the leading China epb21 plastic plain bearings manufacturers and suppliers,Website:http://www.csbbearings.com, and also a professional epb21 plastic plain bearings factory and company, we are always at your services.EPB21 Plastic Plain Bearings● Low friction and good wear resistance for high temperature applications. The excellent chemical resistance of the material ensures athe applications for high temperature and high chemical erosion applications.● Continuous working temperature: -40℃～200℃;● Very low coefficient of friction;● Maintenance-free dry operation;● High temperature and good chemical resistance;● Suitable for humid environment.The Material Data SheetTypical ItemStandardUnitCSB-EPB21   DensityISO1183g/cm³1.53   ColorBuff   Dynamic friction /steel(dry)0.05-0.20   Max. PV (dry)N/mm²×m/s0.80   Max. roatating velocitym/s2.00   Max. oscillating velocitym/s1.00   Max. linear velocitym/s5.00   Tensile strengthISO527MPa55   Compressive strength (Axial)MPa78   E-moduleISO527MPa2800   Max. static pressure of the surface, 20℃MPa80  Shore hardnessISO868D77   Continuous work temperature℃-40/200   Short-time work temperature℃-40/240   Thermal conductivityASTME1461W/m×k0.5   Linear coef. of thermal expansionASTMD696K-1×10-55   Moisture absorption RH50/23℃ASTMD570%0.1   Max. water absorption, 23℃%0.3   FlammabilityUL94V0   Volume resistivityIEC60093Ωcm>1012   Surface resistivityIEC60093Ω>1011PV Value of BearingsThe max PV value of the CSB-EPB21 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 EPB21-1).The Relation of Load, Speed and TemperatureCSB-EPB21 allows the Max static load of 80Mpa, The max compressive deformation rate under the max load is listed in Graph EPB21-2, The actual load capacity of bearing is slightly less than 80Mpa, The bearing load is variable against the speed and temperature, Fast speed (Vmax: 2.0m/s) results into higher temperature (Tmax: 200℃) which decreases the load capacity of the bearing. Please refer to the Graph EPB21-3 for such variation.The Friction Factor,Wearing and shaft materialFriction Factor   Friction factor will be slightly decreased along with the speed increasing under certain loading of the rotation operation (see Graph EPB21-4) and it will be slightly decreased along with the loading increasing under certain speed of the rotation operation especially when the loading is less than 30Mpa. Graph EPB21-5 tells that the friction of the CSB-EPB21 is not changed at all when the shaft roughness is between Ra0.3 to Ra0.4 and will be considerably increased when the shaft roughness is over Ra0.4. SoCSB-EPB21DryGreaseOilWaterFriction coef. μ0.03~0.150.090.040.04Wearing and shaft materialGraph EPB21-7 shows that CSB-EPB21 is suitable for most of the shaft materials under low loading rotation operation and it is good for hardened carbon steel shaft under high loading rotation operation (see Graph EPB21-7). From Graph EPB21-8, we can also read that CSB-EPB21 is suitable for stainless steel shaft under oscillation operation and good for hot rolled carbon steel and hardened carbon steel shaft under rotation operation.Chemical ResistanceThe Chemical Resistance of CSB-EPB21 is fairly good against most of Acid and Alkalis.Water AbsorbabilityThe water absorb rate of CSB-EPB21 is 0.1% under the atmospheric pressure while it is 0.3% when the material is immerged into water. The material performance and dimensions of the material is stabilized for the applications under humid environment.UV ResistanceDisintegration could be possible for the material CSBEPB21 after long period of exposing under the UV ray and therefore the compressive strength will be reduced.Bearing InstallationCSB-EPB21A 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