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The Material Data Sheet

Material Properties Standard Unit EPB21
Density ISO1183 g/cm3 1.53
color

Buff
Max. moisture absorption at +23℃ /RH50%
ASTMD570 % 0.1
MAX. water absorption

% 0.3
Dynamic friction /steel(dry)


0.05-0.20
MAX.PV(dry)
N/mm2×m/s 0.7
Flexural modulus
ISO178 MPa 2800
Flexural strength at  +23℃ ISO178 MPa 55
Compressive strength

MPa 78
MAX.static pressure of the surface,+20
MPa 80
Shore hardness
ISO868 D 77
Continuous work temperature

-40/+200
Short-time work temperature

-40/+240
Thermal conductivity
ASTME1461 W/m*k 0.5
Linear coef. of thermal expansion at +23℃ ASTMD696 K-1×10-5 5
Flammability UL94
VO
Volume resistivity IEC60093 Ωcm 1×1012
Surface resistivity IEC60093 Ω 1×1011


Standard bearings
  • EPB21 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-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 Temperature

CSB-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 material

Friction 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. So the recommended shaft roughness is Ra0.3- Ra0.4.

CSB-EPB21
Dry
Grease
Oil
Water
Friction coef. μ
0.03~0.15
0.09
0.04
0.04


Wearing and shaft material

Graph 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 Resistance

The Chemical Resistance of CSB-EPB21 is fairly good against most of Acid and Alkalis.

Water Absorbability

The 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 Resistance

Disintegration 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 Installation

CSB-EPB21A 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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