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The Material Data Sheet

Material Properties Standard Unit EPB25
Density ISO1183 g/cm3 1.44
color

Yellow
Max. moisture absorption at +23℃ /RH50%
ASTMD570 % 0.3
MAX. water absorption

% 1.6
Dynamic friction /steel(dry)


0.08-0.20
MAX.PV(dry)
N/mm2×m/s 0.45
Flexural modulus
ISO178 MPa 2200
Flexural strength at  +23℃ ISO178 MPa 55
Compressive strength

MPa 60
MAX.static pressure of the surface,+20
MPa 60
Shore hardness
ISO868 D 80
Continuous work temperature

-100/+180
Short-time work temperature

-100/+210
Thermal conductivity
ASTME1461 W/m*k 0.24
Linear coef. of thermal expansion at +23℃ ASTMD696 K-1×10-5 7
Flammability UL94
VO
Volume resistivity IEC60093 Ωcm 1×1013
Surface resistivity IEC60093 Ω 1×1010


Standard bearings
  • EPB25 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-EPB25 series bearing is 0.45N/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 EPB25-1).

The Relation of Load, Speed and Temperature

CSB-EPB25 allows the Max static load of 60Mpa, The max compressive deformation rate under the max load is listed in Graph EPB25-2, The actual load capacity of bearing is slightly less than 60Mpa, The bearing load is variable against the speed and temperature, Fast speed (Vmax: 1.3m/s) results into higher temperature (Tmax: 180℃) which decreases the load capacity of the bearing. Please refer to the Graph EPB25-3 for such variation.

The Friction Factor,Wearing and shaft material

Friction Factor
Graph EPB25-4 shows that the friction factor of CSBEPB25 is not sensitive to the operation speed and Graph EPB25-5 shows that the friction factor is CSB-EPB25 is decreased along with the loading increasing and become stable when the loading is over 20Mpa. Graph EPB25-6 tells that the friction factor of CSB-EPB25 is also not sensitive to the shaft roughness but we still recommend the shaft roughness to be Ra0.7~0.9.

CSB-EPB25
Dry
Grease
Oil
Water
Friction coef. μ
0.05~0.15
0.09
0.04
0.04


Wearing and shaft material

Graph EPB25-7 shows that the wearing of CSB-EPB25 is sensitive to different materials under rotation operation with the loading of 2Mpa. It is suitable for hardened shaft, high speed steel shaft and hardened chrome steel shaft in the rotation operation. Hardened chrome steel shaft is the best choice for CSB-EPB25(Graph EPB25-8). The wearing will be decreased as long as the loading increasing.

Chemical Resistance

CSB-EPB25 is good at chemical resistance against weak acidic medium and various kinds of lubricants.

Water Absorbability

The water absorb rate of CSB-EPB25 is 0.3% under the atmospheric pressure while it is 1.6% when the material is immerged into water. The application environment has to be considered because of its water absorb properties.

UV Resistance

CSB-EPB25 can maintain its color unchanged when it is exposed into the UV ray. The material performance stays stable.

Bearing Installation

CSB-EPB25 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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