EPB20 Plastic plain bearings - CSB® Plastic Bearing Technology

Product properties

● 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

● For underwater operation

● For high speed movement

Material properties	Standard	Unit	CSB-EPB20
General properties
Color	-	-	Black
Density	ISO1183	g/cm³	1.53
Max. moisture absorption, 50%RH	ISO62	%	0.2
Max. water absorption	ISO62	%	0.8
Coefficient of sliding friction(steel)	ITS025	µ	0.15-0.35
Max. PV value	ITS026	N/mm²×m/s	0.15
Mechanical properties
Flexural modulus	ISO178	MPa	7200
Flexural strength	ISO178	MPa	120
Max. static load	ITS027	MPa	70
Max. dynamic load	ITS028	MPa	35
Shore hardness	ISO868	D	79
Physical and thermal properties
Long-term application temperature	ITS029	℃	+90
Short-term application temperature	ITS029	℃	+110
Lowest application temperature	ITS029	℃	-50
Thermal conductivity	ISO22007	W/m/K	0.60
Coefficient of thermal expansion	ISO11359	K^-1×10^-5	6
Flammability	UL94	Class	HB
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.

Standard products

Sleeve bearing

Flange bearing

Thrust washer

EPB20 Plastic plain bearings

Part no.:

d1 [mm]：

d2 [mm]：

L_h13 [mm]：

d3_d13 [mm]：

T [mm]：

d1-max. [mm]：

d1-min. [mm]：

d2-max. [mm]：

d2-min. [mm]：

T max. tolerance [mm]：

T min. tolerance [mm]：

Max. shaft [mm]：

Min. shaft [mm]：

Max. housing [mm]：

Min. housing [mm]：

*Lead time [wsk]：

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Dimensions

▊ PV value

The max PV value of the CSB-EPB20 plastic bearings is 0.15N/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 EPB20-1).

EPB20_01-Plastic plain bearings PV value.jpg

▊ Load, speed and temperature

CSB-EPB20 allows the Max static load of 70Mpa, The max compressive deformation rate under the max load is listed in Graph EPB20-2, The actual load capacity of bearing is slightly less than 70Mpa, The bearing load is variable against the speed and temperature, Fast speed (Vmax: 0.5m/s) results into higher temperature (Tmax: 90℃) which decreases the load capacity of the bearing. Please refer to the Graph EPB20-3 for such variation.

EPB20_02-Plastic plain bearings load.jpg EPB20_03-Plastic plain bearings load and tepmerature.jpg

▊ Friction factor, wear and shaft material

▊ Friction factor

Similar with most of the plastic bearings, the friction factor of CSB-EPB20 is increased along with the operation speed when the loading is stable (see Graph EPB20-4) and is decreased along with the loading increasing when the operation speed is stable (see Graph EPB20-5). From Graph EPB20-6, it shows the friction factor of CSB-EPB20 is variable against different shaft surface roughness. The recommended shaft surface roughness is Ra0.3~0.6.

CSB-EPB20	Dry	Grease	Oil	Water
Friction coef. μ	0.15~0.35	0.09	0.04	0.04

EPB20_04-Plastic plain bearings friction and speed.jpg EPB20_05-Plastic plain bearings friction and load.jpg EPB20_06-Plastic plain bearings friction and surface roughness of shaft.jpg

▊ Wearing and shaft material

Graph EPB20-7 and EPB20-8 shows that CSB-EPB20 is rather suitable for hardened steel shaft and hardened chrome steel shaft under lower loading and Graph EPB20-7 shows that CSB-EPB20 wearing feature is better for oscillation operation than of rotation operation.

EPB20_07-Plastic plain bearings wear and shaft materials.jpg EPB20_08-Plastic plain bearings wear and load.jpg

▊ Chemical resistance

CSB-EPB20 is good at chemical resistance against weak acidic medium and various kinds of lubricants.

▊ Water absorption

The moisture absorption of CSB-EPB20 plastic plain bearings is 0.2% in standard atmosphere. The max. water absorption is 0.8% in water. These values are very low, CSB-EPB20 plastic palin bearings is very well suited for used in water.

EPB20_09-Plastic plain bearings moisture absorption.jpg

▊ UV resistance

Disintegration could be possible for the material CSB-EPB20 after long period of exposing under the UV ray and therefore the performance of the material will be reduced.

▊ Installation tolerances

CSB-EPB20 Tolerances after pressfit

Diameter [mm]	CSB-EPB20 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-EPB20 Plastic Plain Bearings

Type PDF

Size 588KB

Time 09-2021

No. CSB/CAT.062E

download

1469

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.

Medium	EPB20 bearings resistance
Alcohol	Resistant
Hydrocarbons	Resistant
Greases. oils	Resistant
Fuels	Resistant
Diluted acids	Conditionally resistant
Strong acids	Not resistant
Diluted alkalis	Resistant
Strong alkalis	Conditionally 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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