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CSB塑料轴承产品05
CSB塑料轴承产品04
EPB25 Plastic plain bearings

Product properties

● 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.

EPB25 Plastic plain bearings
Dimensions

 PV value

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).

EPB25_01-Plastic plain bearings PV value.jpg

▊ 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. 

EPB25_02-Plastic plain bearings load.jpgEPB25_03-Plastic plain bearings load and tepmerature.jpg

▊ 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

EPB25_04-Plastic plain bearings friction and speed.jpgEPB25_05-Plastic plain bearings friction and load.jpgEPB25_06-Plastic plain bearings friction and surface roughness of shaft.jpg

 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. 

EPB25_07-Plastic plain bearings wear and shaft materials.jpgEPB25_08-Plastic plain bearings wear and load.jpg

 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.

EPB25_09-Plastic plain bearings moisture absorption.jpg

 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


CSB-EPB® Plastic Bearings 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 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] 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.
CSB-SFP® 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.

CSB-EPB25 Plastic Plain Bearings

Type PDF
Size 584KB
Time 09-2021
No. CSB/CAT.062E
download

954

MediumEPB25 bearings resistance
AlcoholResistant
HydrocarbonsConditionally resistant
Greases. oilsResistant
FuelsResistant
Diluted acidsResistant
Strong acidsConditionally resistant
Diluted alkalisResistant
Strong alkalisResistant
CSB® Bearing Material Chemical Resistance

Please select bearing material and medium...

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.

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