EPB Plastic plain bearings - CSB® Plastic Bearing Technology

Product properties

● The most common CSB plastic bearing material. It is suitbale for the applications with working temperature not higher than 80℃. It is the prefereable material with good wear resistance and economic efficient for a new designation.

● Continuous working temperature: -40℃/+80℃;
● Very common; suitable for most of average and low load;
● Maintenance-free dry operation;
● Light wear against different shaft materials;
● Low friction.

Material properties	Standard	Unit	CSB-EPB
General properties
Color	-	-	Dark grey
Density	ISO1183	g/cm³	1.46
Max. moisture absorption,50%RH	ISO62	%	0.3
Max. water absorption	ISO62	%	1.2
Coefficient of sliding friction(steel)	ITS025	µ	0.05-0.15
Max. PV value	ITS026	N/mm²×m/s	0.40
Mechanical properties
Flexural modulus	ISO178	MPa	2300
Flexural strength	ISO178	MPa	60
Max. static load	ITS027	MPa	35
Max. dynamic load	ITS028	MPa	15
Shore hardness	ISO868	D	75
Physical and thermal properties
Long-term application temperature	ITS029	℃	+80
Short-term application temperature	ITS029	℃	+120
Lowest application temperature	ITS029	℃	-40
Thermal conductivity	ISO22007	W/m/K	0.20
Coefficient of thermal expansion	ISO11359	K^-1×10^-5	10
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.

Standard products

Sleeve bearing

Flange bearing

Thrust washer

EPB 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-EPB 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 EPB-1).

EPB_01-Plastic plain bearings PV value.jpg

█ Load, speed and temperature

CSB-EPB allows the Max static load of 35Mpa, The max compressive deformation rate under the max load is listed in Graph EPB-2, The actual load capacity of bearing is slightly less than 35Mpa, The bearing load is variable against the speed and temperature, Fast speed (Vmax: 1.0m/s) results into higher temperature (Tmax: 80℃) which decreases the load capacity of the bearing. Please refer to the Graph EPB-3 for such variation.

EPB_02-Plastic plain bearings load.jpg EPB_03-Plastic plain bearings load and tepmerature.jpg

█ Friction factor, wear and shaft material

▉ Friction factor
CSB-EPB friction factor is not sensitive to the operation speed and bearing loading (see Graph EPB-4 and Graph EPB-5). The above features are the most common considerations for the bearing material selection. The friction of CSB-EPB could be maintained at a relatively lower level so that the good wearing features are guaranteed. From the Graph EPB-6, we could see that the friction factor is variable against the changing of shaft roughness. The recommended shaft roughness is Ra0.3~0.5.

CSB-EPB	Dry	Grease	Oil	Water
Friction coef. μ	0.05~0.15	0.09	0.04	0.04

EPB_04-Plastic plain bearings friction and speed.jpg EPB_05-Plastic plain bearings friction and load.jpg EPB_06-Plastic plain bearings friction and surface roughness of shaft.jpg

▉ Wearing and shaft material
The shaft material is an important media for the bearing wearing but CSB-EPB is suitable for almost all kinds of shaft materials. Graph EPB-7 and Graph EPB-8 show that the wearing feature of CSB-EPB is excellent when the shaft material are hardened chrome steel or hardened steel or hardened Aluminum.

EPB_07-Plastic plain bearings wear and shaft materials.jpg EPB_08-Plastic plain bearings wear and load.jpg

█ Chemical resistance

CSB-EPB is good at chemical resistance against mild base, weak acidic medium and various kinds of lubricants.

█ Water absorption

The moisture absorption of CSB-EPB plastic bearings is 0.3% in standard atmosphere. The max. water absorption is 1.2% in water. These values are so low that design changes due to absorption are only necessary in extreme applications.

EPB_09-Plastic plain bearings moisture absorption.jpg

█ UV resistance

CSB-EPB can maintain its color unchanged when it is exposed into the UV ray. The hardness, Compressive strength and wear resistance of the material is also stable under such condition.

▊ Installation tolerances

CSB-EPB plastic plain bearings are press-fit sliding bearings. The inner diameter adjusts only after press-fitting into the correctly toleranced bearing housings. The press-fit interference can be up to 2% of the inner diameter. This ensures that the plain bearing is securely press-fitted. Axial movement in the housing are also prevented in this way.

Diameter [mm]	CSB-EPB 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

工程塑料轴承查找器 — CSB-EPB®

Plain Bearings Finder

view tools

▊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.

自润滑半成品查询器 — CSB-SFP®

Rods and plates Finder

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.

CSB-EPB Plastic Plain Bearings

Type PDF

Size 589KB

Time 09-2021

No. CSB/CAT.062E

download

1309

Medium	EPB 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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