● A special material for the application in water. The wear resistance could even be improved in water. It is able to be continously operated in a chemical liquid with temperature of 200 ℃
● Continuous working temperature: -40℃/+200℃
● Good wear resistance under high load
● Suitable for underwater operation
● Good chemical resistance
Material properties
Standard
Unit
CSB-EPB8
General properties
Color
-
-
Dark grey
Density
ISO1183
g/cm3
1.55
Max. moisture absorption, 50%RH
ISO62
%
0.1
Max. water absorption
ISO62
%
0.1
Coefficient of sliding friction(steel)
ITS025
µ
0.07-0.18
Max. PV value
ITS026
N/mm2×m/s
0.80
Mechanical properties
Flexural modulus
ISO178
MPa
8000
Flexural strength
ISO178
MPa
150
Max. static load
ITS027
MPa
85
Max. dynamic load
ITS028
MPa
47
Shore hardness
ISO868
D
82
Physical and thermal properties
Long-term application temperature
ITS029
℃
+200
Short-term application temperature
ITS029
℃
+240
Lowest application temperature
ITS029
℃
-40
Thermal conductivity
ISO22007
W/m/K
0.50
Coefficient of thermal expansion
ISO11359
K-1×10-5
5
Flammability
UL94
Class
V0
Electrical properties
Volume resistance
IEC60093
Ω·cm
>105
Surface resistance
IEC60093
Ω
>105
*ITS: CSB company's internal test standards. **Test temperatures are 23℃ unless otherwise stated.
The max PV value of the CSB-EPB8 plastic bearings 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 EPB8-1).
▊ Load, speed and temperature
CSB-EPB8 allows the Max static load of 85Mpa, The max compressive deformation rate under the max load is listed in Graph EPB8-2, The actual load capacity of bearing is slightly less than 85Mpa, The bearing load is variable against the speed and temperature, Fast speed (Vmax: 1.2m/s) results into higher temperature (Tmax: 200℃) which decreases the load capacity of the bearing. Please refer to the Graph EPB8-3 for such variation.
▊ Friction factor, wear and shaft material
▊ Friction factor
Graph EPB8-4 shows that the friction factor of CSB-EPB8 is not considerably affected by the operation speed when the loading is stable. The special embedded lubricant helps the material to be suitable for the underwater operation. When the operation speed keeps stable and the loading is over 20Mpa, the friction factor of CSB-EPB8 is not variable along with the loading change (See Graph EPB8-5). The shaft roughness highly affects the friction factor but this affecting will be stable when the shaft roughness is better than Ra0.7 (See Graph EPB8-6). The recommended shaft roughness is Ra0.2 to Ra0.3.
CSB-EPB8
Dry
Grease
Oil
Water
Friction coef. μ
0.07~0.18
0.09
0.04
0.04
▊ Wearing and shaft material
The rotation test against different shaft material showing in Graph EPB8-7 and Graph EPB8-8 induces that the best mating shaft material for the material CSB-EPB8 is hardened chrome steel shaft but not stainless steel shaft. CSB-EPB8 is best for stainless steel and hardened chrome steel shaft in oscillation operation and especially the hardened chrome steel shaft is the best choice in rotation operation.
▊ Chemical resistance
The Chemical Resistance of CSB-EPB8 is fairly good against most of Acid and Alkalis.
▊ Water absorption
The moisture absorption of CSB-EPB8 plastic plain bearings is 0.1% in standard atmosphere. The max. water absorption is 0.1% in water. These values are very low, CSB-EPB8 plastic palin bearings is very well suited for used in water.
▊ UV resistance
Disintegration could be possible for the material CSB-EPB8 after long period of exposing under the UV ray and therefore the compressive strength will be reduced.
▊ Installation tolerances
CSB-EPB8 Tolerances after pressfit
Diameter [mm]
CSB-EPB8 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
EPB8 bearings resistance
Alcohol
Resistant
Hydrocarbons
Resistant
Greases. oils
Resistant
Fuels
Resistant
Diluted acids
Conditionally 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.
A self-lubricating material for applications in water. It is suitable for high speed motion under low load. Continuous working temperature: -50℃/+90℃. Suitable for medium load operation...
