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  5. EPB7 Plastic plain bearings
EPB7 Plastic plain bearings

Product properties

● A material with low friction factor and good wear resistance. The outstanding wear resistance feature of it ensures the applications where the other plastic bearings are not suitable. It is good for both hard and soft shaft

● Continuous working temperature: -40℃/+90℃

● Good wear resistance with long service life

● Suitable for operation in dusty environment

● No special requirement on the surface roughness

● Low friction coefficient

● Applicable for flexible shaft

Material properties 

Standard

Unit

CSB-EPB7

General properties

Color

-

-

Cream

Density 

ISO1183

g/cm3

1.25

Max. moisture absorption, 50%RH

ISO62

%

1.3

Max. water absorption

ISO62

%

6.5

Coefficient of sliding friction(steel)

ITS025

µ

0.09-0.20

Max. PV value

ITS026

N/mm2×m/s

0.50

Mechanical properties

Flexural modulus

ISO178

MPa

3200

Flexural strength

ISO178

MPa

75

Max. static load

ITS027

MPa

60

Max. dynamic load

ITS028

MPa

25

Shore hardness

ISO868

D

75

Physical and thermal properties

Long-term application temperature

ITS029

℃

+90

Short-term application temperature 

ITS029

℃

+180

Lowest application temperature

ITS029

℃

-40

Thermal conductivity

ISO22007

W/m/K

0.24

Coefficient of thermal expansion 

ISO11359

K-1×10-5

9

Flammability

UL94

Class

HB

Electrical properties 

Volume resistance

IEC60093

Ω·cm

>1013

Surface resistance 

IEC60093

Ω

>1012

*ITS: CSB company's internal test standards.   **Test temperatures are 23℃ unless otherwise stated.

EPB7 Plastic plain bearings
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Dimensions

▊ PV value

The max PV value of the CSB-EPB7 plastic bearings is 0.5N/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 EPB7-1).

EPB7_01-Plastic plain bearings PV value.jpg

▊ Load, speed and temperature

CSB-EPB7 allows the Max static load of 60Mpa, The max compressive deformation rate under the max load is listed in Graph EPB7-2, The actual load capacity of bearing is slightly less than 60Mpa, The bearing load is variable against the speed and temperature, Fast speed(Vmax: 1.0m/s) results into higher temperature (Tmax: 90℃) which decreases the load capacity of the bearing. Please refer to the Graph EPB7-3 for such variation. 

EPB7_02-Plastic plain bearings load.jpgEPB7_03-Plastic plain bearings load and tepmerature.jpg

▊ Friction factor, wear and shaft material

▊ Friction factor

CSB-EPB7 Bearing Friction factor is not so sensitive to the operation speed (see Graph EPB7-4). The friction factor is considerably decreased along with the loading increasing and it will be turned to be stable when the loading reaches 20Mpa. Graph EPB7-5 shows the friction factor of the bearing is also not sensitive to the shaft roughness but we still recommend that the roughness of the shaft should be neither too smooth nor too rough. It is recommended to keep the roughness of the shaft to be within the range of Ra0.3 to Ra0.6.

CSB-EPB7
Dry
Grease
Oil
Water
Friction coef. μ
0.09~0.20
0.09
0.04
0.04



EPB7_04-Plastic plain bearings friction and speed.jpgEPB7_05-Plastic plain bearings friction and load.jpgEPB7_06-Plastic plain bearings friction and surface roughness of shaft.jpg

▊ Wearing and shaft material

Graph EPB7-7 shows that the CSB-EPB7 material is not sensitive with different materials under the rotating operation. It is suitable for hard shaft and high speed steel shaft as well as hard chrome steel shaft. Graph EPB7-8 shows that the hard chrome steel shaft is most suitable for using CSB-EPB7 bearing because the wearing speed is not sensitive when the loading is increased. From the Graph EPB7-8, it shows that CSB-EP7 features different performance. 

EPB7_07-Plastic plain bearings wear and shaft materials.jpgEPB7_08-Plastic plain bearings wear and load.jpg

▊ Chemical resistance

CSB-EPB7 is good at chemical resistance against weak acidic medium and various kinds of lubricants.

▊ Water absorption

The moisture absorption of CSB-EPB7 plastic plain bearings is 1.3% in standard atmosphere. The max. water absorption is 6.5% in water. The application environment has to be considered due to the high water absorbtion properties.

EPB7_09-Plastic plain bearings moisture absorption.jpg

▊ UV resistance

The color of CSB-EPB7 could be dimmed when it is exposed into the UV ray. The material performance stays stable.


▊ Installation tolerances

CSB-EPB7 bushing tolerances after pressfit

Diameter [mm]
Inner diameter E10 [mm]
Housing H7 [mm]
Shaft h9 [mm]
>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

CSB-EPB7 Plastic Plain Bearings

Type PDF
Size 583KB
Time 09-2021
No. CSB/CAT.062E
download

1285

工程塑料轴承查找器

CSB-EPB®

CSB-EPB® Plain bearings finder V2.1

view tools

▊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.

自润滑半成品查询器

CSB-SFP®

CSB-SFP® Semi-finished Products Finder V2.0

view tools

▊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.

MediumEPB7 bearings resistance
AlcoholResistant
HydrocarbonsResistant
Greases. oilsResistant
FuelsResistant
Diluted acidsConditionally resistant
Strong acidsNot resistant
Diluted alkalisResistant
Strong alkalisConditionally resistant
▊ 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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