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  5. EPB21 Plastic plain bearings
EPB21 Plastic plain bearings

Product properties

● Low friction and good wear resistance for high temperature applications. The excellent chemical resistance of the material ensures athe applications for high temperature and high chemical erosion applications

● Continuous working temperature: -40℃/+200℃

● Very low coefficient of friction

● Maintenance-free dry operation

● High temperature and good chemical resistance

● Suitable for humid environment

Material properties 

Standard

Unit

CSB-EPB21

General properties

Color

-

-

Beige

Density 

ISO1183

g/cm3

1.53

Max. moisture absorption, 50%RH

ISO62

%

0.1

Max. water absorption

ISO62

%

0.3

Coefficient of sliding friction(steel)

ITS025

µ

0.05-0.20

Max. PV value

ITS026

N/mm2×m/s

0.80

Mechanical properties

Flexural modulus

ISO178

MPa

2800

Flexural strength

ISO178

MPa

55

Max. static load

ITS027

MPa

80

Max. dynamic load

ITS028

MPa

37

Shore hardness

ISO868

D

77

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

0.24

Coefficient of thermal expansion 

ISO11359

K-1×10-5

6

Flammability

UL94

Class

V0

Electrical properties 

Volume resistance

IEC60093

Ω·cm

>1012

Surface resistance 

IEC60093

Ω

>1011

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

EPB21 Plastic plain bearings
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Dimensions

▊ PV value

The max PV value of the CSB-EPB21 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 EPB21-1).

EPB21_01-Plastic plain bearings PV value.jpg

▊ Load, speed and temperature

CSB-EPB21 allows the Max static load of 80Mpa, The max compressive deformation rate under the max load is listed in Graph EPB21-2, The actual load capacity of bearing is slightly less than 80Mpa, The bearing load is variable against the speed and temperature, Fast speed (Vmax: 1.5m/s) results into higher temperature (Tmax: 200℃) which decreases the load capacity of the bearing. Please refer to the Graph EPB21-3 for such variation. 

EPB21_02-Plastic plain bearings load.jpgEPB21_03-Plastic plain bearings load and tepmerature.jpg

▊ Friction factor, wear and shaft material

▊ Friction factor

Friction factor will be slightly decreased along with the speed increasing under certain loading of the rotation operation (see Graph EPB21-4) and it will be slightly decreased along with the loading increasing under certain speed of the rotation operation especially when the loading is less than 30Mpa. Graph EPB21-5 tells that the friction of the CSB-EPB21 is not changed at all when the shaft roughness is between Ra0.3 to Ra0.4 and will be considerably increased when the shaft roughness is over Ra0.4. So the recommended shaft roughness is Ra0.3-Ra0.4.

CSB-EPB21
Dry
Grease
Oil
Water
Friction coef. μ
0.05~0.20
0.09
0.04
0.04



EPB21_04-Plastic plain bearings friction and speed.jpgEPB21_05-Plastic plain bearings friction and load.jpgEPB21_06-Plastic plain bearings friction and surface roughness of shaft.jpg

▊ Wearing and shaft material

Graph EPB21-7 and EPB21-8 shows that CSB-EPB21 is suitable for most of the shaft materials under rotation operation and it is good for stainless steel shaft under high loading rotation operation (see Graph EPB21-8). CSB-EPB21 is suitable for oscillation operation, Stainless steel shaft and hardened aluminum shaft is suitable for the bearing under rotation operation.

EPB21_07-Plastic plain bearings wear and shaft materials.jpgEPB21_08-Plastic plain bearings wear and load.jpg

▊ Chemical resistance

The Chemical Resistance of CSB-EPB21 is fairly good against most of Acid and Alkalis.

▊ Water absorption

The moisture absorption of CSB-EPB21 plastic plain bearings is 0.1% in standard atmosphere. The max. water absorption is 0.3% in water . These values are very low, CSB-EPB21 plastic palin bearings is very well suited for used in wet applications.

EPB21_09-Plastic plain bearings moisture absorption.jpg

▊ UV resistance

Disintegration could be possible for the material CSB-EPB21 after long period of exposing under the UV ray and therefore the compressive strength will be reduced.

▊ Installation tolerances

CSB-EPB21 Tolerances after pressfit

Diameter [mm]
CSB-EPB21 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-EPB21 Plastic Plain Bearings

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

1490

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.

MediumEPB21 bearings resistance
AlcoholResistant
HydrocarbonsResistant
Greases. oilsResistant
FuelsResistant
Diluted acidsConditionally resistant
Strong acidsConditionally 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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