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The Material Data Sheet

Material Properties Standard Unit EPB20
Density ISO1183 g/cm3 1.52
color

Black
Max. moisture absorption at +23℃ /RH50%
ASTMD570 % 0.2
MAX. water absorption

% 0.8
Dynamic friction /steel(dry)


0.15-0.35
MAX.PV(dry)
N/mm2×m/s 0.21
Flexural modulus
ISO178 MPa 9500
Flexural strength at  +23℃ ISO178 MPa 90
Compressive strength

MPa 70
MAX.static pressure of the surface,+20
MPa 40
Shore hardness
ISO868 D 78
Continuous work temperature

-50/+90
Short-time work temperature

-50/+110
Thermal conductivity
ASTME1461 W/m*k 0.6
Linear coef. of thermal expansion at +23℃ ASTMD696 K-1×10-5 6
Flammability UL94
HB
Volume resistivity IEC60093 Ωcm 1×105
Surface resistivity IEC60093 Ω 1×105


Standard bearings
  • EPB20 Plastic Plain Bearings,Metric size
  • Product code:
  • Inner diameter d1[mm]:
  • Outer diameter d2[mm]:
  • Height L[mm]:
  • Flanges outer diameter d3[mm]:
  • Flanges thickness t[mm]:
  • d1-Min.tolerance[mm]:
  • d1-Max.tolerance[mm]:
  • d2-Min.tolerance[mm]:
  • d2-Max.tolerance[mm]:
  • L-Min.tolerance[mm]:
  • L-Max.tolerance[mm]:
  • Shaft-Min.tolerance[mm]:
  • Shaft-Max.tolerance[mm]:
  • Housing-Min.tolerance[mm]:
  • Housing-Max.tolerance[mm]:

PV Value of Bearings

The 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 Temperature

CSB-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 material

Friction 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-EPB20
Dry
Grease
Oil
Water
Friction coef. μ
0.07~0.20
0.09
0.04
0.04


Wearing and shaft material

Graph 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 Resistance

CSB-EPB20 is good at chemical resistance against weak acidic medium and various kinds of lubricants.

Water Absorbability

The 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 Resistance

Disintegration 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 Installation

CSB-EPB20 The Interfit Tolerance

Diameter mm
Tolerance after fit E10
Fit Housing H7
Fit Shaft h9
>0~3
+0.014~+0.054
0~+0.010
0~-0.025
>3~6
+0.020~+0.068
0~+0.012
0~-0.030
>6~10
+0.025~+0.083
0~+0.015
0~-0.036
>10~18
+0.032~+0.102
0~+0.018
0~-0.043
>18~30
+0.040~+0.124
0~+0.021
0~-0.052
>30~50
+0.050~+0.150
0~+0.025
0~-0.062
>50~80
+0.060~+0.180
0~+0.030
0~-0.074
>80~120
+0.072~+0.212
0~+0.035
0~-0.087
>120~180
+0.085~+0.245
0~+0.040
0~-0.100

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Bearing Design System

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