EPB18 Plastic plain bearings - CSB® Plastic Bearing Technology

Product properties

● A self-lubricating material with low water absorbtion. Good wear resistance will be maintained when used with soft shaft and hard shaft combined

● Continuous working temperature: -40℃/+100℃

● Maintenance-free dry operation

● High load requirement

● Suitable for working in humid environment

Material properties	Standard	Unit	CSB-EPB18
General properties
Color	-	-	Yellow
Density	ISO1183	g/cm³	1.40
Max. moisture absorption, 50%RH	ISO62	%	0.3
Max. water absorption	ISO62	%	0.5
Coefficient of sliding friction(steel)	ITS025	µ	0.05-0.18
Max. PV value	ITS026	N/mm²×m/s	0.40
Mechanical properties
Flexural modulus	ISO178	MPa	2700
Flexural strength	ISO178	MPa	65
Max. static load	ITS027	MPa	50
Max. dynamic load	ITS028	MPa	21
Shore hardness	ISO868	D	75
Physical and thermal properties
Long-term application temperature	ITS029	℃	+100
Short-term application temperature	ITS029	℃	+160
Lowest application temperature	ITS029	℃	-40
Thermal conductivity	ISO22007	W/m/K	0.25
Coefficient of thermal expansion	ISO11359	K^-1×10^-5	8
Flammability	UL94	Class	HB
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.

Standard products

Sleeve bearing

Flange bearing

Thrust washer

EPB18 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-EPB18 plastic bearings is 0.4N/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 EPB18-1).

EPB18_01-Plastic plain bearings PV value.jpg

▊ Load, speed and temperature

CSB-EPB18 allows the Max static load of 50Mpa, The max compressive deformation rate under the max load is listed in Graph EPB18-2, The actual load capacity of bearing is slightly less than 50Mpa, The bearing load is variable against the speed and temperature, Fast speed (Vmax: 1.0m/s) results into higher temperature (Tmax: 100℃) which decreases the load capacity of the bearing. Please refer to the Graph EPB18-3 for such variation.

EPB18_02-Plastic plain bearings load.jpg EPB18_03-Plastic plain bearings load and tepmerature.jpg

▊ Friction factor, wear and shaft material

▊ Friction factor

Graph EPB18-4 shows that as the same as most of the slide bearing materials, the friction factor of CSB-EPB18 is increasing along with the rotation speed under a certain loading while as shown in figure EPB18-5, it is decreased along with the increasing of loading when the operation speed is stable. From figure EPB18-6, it is found that the most suitable shaft roughness is Ra0.2 to Ra0.6. Smoother shaft or rougher shaft may result into friction factor increasing.

CSB-EPB18	Dry	Grease	Oil	Water
Friction coef. μ	0.05~0.18	0.09	0.04	0.04

EPB18_04-Plastic plain bearings friction and speed.jpg EPB18_05-Plastic plain bearings friction and load.jpg EPB18_06-Plastic plain bearings friction and surface roughness of shaft.jpg

▊ Wearing and shaft material

Graph EPB18-7 and EPB18-8 shows the wearing is considerably affected by the shaft materials. Heat-treated steel shaft and carbon steel shaft is good for this bearing material. Graph EPB18-7 tells that CSB-EPB18 is suitable for hardened chrome steel and hardened steel shaft in rotation operation or oscillation operation.

EPB18_07-Plastic plain bearings wear and shaft materials.jpg EPB18_08-Plastic plain bearings wear and load.jpg

▊ Chemical resistance

CSB-EPB18 is good at chemical resistance against weak acidic medium and various kinds of lubricants.

▊ Water absorption

The moisture absorption of CSB-EPB18 plastic plain bearings is 0.3% in standard atmosphere. The max. water absorption is 0.5% in water . These values are very low, CSB-EPB18 plastic palin bearings is very well suited for used in wet applications.

EPB18_09-Plastic plain bearings moisture absorption.jpg

▊ UV resistance

Disintegration could be possible for the material CSB-EPB18 after long period of exposing under the UV ray and therefore the performance of the material will be reduced.

▊ Installation tolerances

CSB-EPB18 Tolerances after pressfit

Diameter [mm]	CSB-EPB18 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-EPB18 Plastic Plain Bearings

Type PDF

Size 582KB

Time 09-2021

No. CSB/CAT.062E

download

1368

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	EPB18 bearings resistance
Alcohol	Resistant
Hydrocarbons	Not resistant
Greases. oils	Resistant
Fuels	Resistant
Diluted acids	Conditionally resistant
Strong acids	Not resistant
Diluted alkalis	Not resistant
Strong alkalis	Not 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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