● Good wear resistance material under high temperature of 180℃. Better wear resistance for the rotation application and it has no critical requirement about the shaft hardness
● Continuous working temperature: -100℃/+180℃
● Maintenance-free dry operation
● Suitable in high load
● Lower friction
Material properties
Standard
Unit
CSB-EPB25
General properties
Color
-
-
Yellow
Density
ISO1183
g/cm3
1.44
Max. moisture absorption, 50%RH
ISO62
%
0.3
Max. water absorption
ISO62
%
1.6
Coefficient of sliding friction(steel)
ITS025
µ
0.08-0.20
Max. PV value
ITS026
N/mm2×m/s
0.45
Mechanical properties
Flexural modulus
ISO178
MPa
4500
Flexural strength
ISO178
MPa
100
Max. static load
ITS027
MPa
60
Max. dynamic load
ITS028
MPa
30
Shore hardness
ISO868
D
79
Physical and thermal properties
Long-term application temperature
ITS029
℃
+180
Short-term application temperature
ITS029
℃
+220
Lowest application temperature
ITS029
℃
-100
Thermal conductivity
ISO22007
W/m/K
0.24
Coefficient of thermal expansion
ISO11359
K-1×10-5
7
Flammability
UL94
Class
V0
Electrical properties
Volume resistance
IEC60093
Ω·cm
>1013
Surface resistance
IEC60093
Ω
>1010
*ITS: CSB company's internal test standards. **Test temperatures are 23℃ unless otherwise stated.
The max PV value of the CSB-EPB25 plastic bearings 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).
▊ 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.
▊ Friction factor, wear and shaft material
▊ Friction factor
Graph EPB25-4 shows that the friction factor of CSB-EPB25 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
0.08~0.20
0.09
0.04
0.04
1
▊ Wearing and shaft material
Graph EPB25-7 and EPB25-8 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, hardened steel shaft and stainless steel shaft in the rotation operation. Hardened chrome steel shaft is the best choice for CSB-EPB25. 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 absorption
The moisture absorption of CSB-EPB25 plastic bearings is 0.3% in standard atmosphere. The max. water absorption is 1.6% in water. These values are so low that design changes due to absorption are only necessary in extreme applications.
▊ UV resistance
CSB-EPB25 can maintain its color unchanged when it is exposed into the UV ray. The material performance stays stable.
▊ Installation tolerances
CSB-EPB25 bushing tolerances after pressfit
Diameter [mm]
Inner diameter F10 [mm]
Housing H7 [mm]
Shaft h9 [mm]
>0～3
+0.006～+0.046
0～+0.010
0～-0.025
>3～6
+0.010～+0.058
0～+0.012
0～-0.030
>6～10
+0.013～+0.071
0～+0.015
0～-0.036
>10～18
+0.016～+0.086
0～+0.018
0～-0.043
>18～30
+0.020～+0.104
0～+0.021
0～-0.052
>30～50
+0.025～+0.125
0～+0.025
0～-0.062
>50～80
+0.030～+0.150
0～+0.030
0～-0.074
>80～120
+0.036～+0.176
0～+0.035
0～-0.087
>120～180
+0.043～+0.203
0～+0.040
0～-0.100
Medium
EPB25 bearings resistance
Alcohol
Resistant
Hydrocarbons
Conditionally resistant
Greases. oils
Resistant
Fuels
Resistant
Diluted acids
Resistant
Strong acids
Conditionally resistant
Diluted alkalis
Resistant
Strong alkalis
Resistant
CSB® Bearing Material Chemical Resistance
Please select bearing material and medium...
R - Resistant
CR - Conditionally resistant
NR - Not resistant
ND - No test data
RD - Resistant，but the dimension changed due to moisture absorption
NO - No data
CSB® bearing material chemical resistance data is a comparison test result of the CSB chemistry laboratory using laboratory specimens or similar chemicals at room temperature 23 ℃, without considering the impact of other temperatures and chemical medium mixtures on the chemical resistance of CSB® bearing materials ; Therefore, this data can only act as a reference. CSB® recommends that the chemical resistance of actual parts should be tested under application conditions and verify the suitability of the bearings.
▊CSB-EPB® Plastic Bearings Finder[V2.1] is based on the analysis and calculation of a large number of test data in CSB® laboratory. You can calculations material data by entering parameters such as bearing load, speed, and temperature, and finally output material adaptation data. ▊Because the system calculate and analyze based on lab data, it can't exactly meet the ractual use requirements absolutly. The system data verification has certain limitations; CSB® recommends that the bearing must be tested again to verify whether it meets the actual use requirements. ▊CSB-EPB® Plastic Bearings Finder output data information is only for design reference, and can not be used as the final standard for determining the bearing material conformity, If you have any questions, please contact CSB® sales engineers.
CSB-SFP®
Semi-finished Products Finder V2.0
view tools
DURAPLAS® Semi-finished Products Finder V2.0
▊DURAPLAS® Semi-finished Products Finder[V2.0] is based on the analysis and calculation of a large number of test data in CSB® laboratory. You can calculations material data by entering parameters such as bearing load, speed, and temperature, and finally output material adaptation data. ▊Because the system calculate and analyze based on lab data, it can't exactly meet the ractual use requirements absolutly. The system data verification has certain limitations; CSB® recommends that the products must be tested again to verify whether it meets the actual use requirements. ▊DURAPLAS® Semi-finished Products Finder output data information is only for design reference, and can not be used as the final standard for determining the bearing material conformity, If you have any questions, please contact CSB® sales engineers.
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