EPB25 Plastic plain bearings - CSB® Plastic Bearing Technology

Product properties

● Good wear resistance material under high temperature of 180℃. Better wear resistance for the rotation application and it has no critical requirement about the shaft hardness

● Continuous working temperature: -100℃/+180℃

● Maintenance-free dry operation

● Suitable in high load

● Lower friction

Material properties	Standard	Unit	CSB-EPB25
General properties
Color	-	-	Yellow
Density	ISO1183	g/cm³	1.44
Max. moisture absorption, 50%RH	ISO62	%	0.3
Max. water absorption	ISO62	%	1.6
Coefficient of sliding friction(steel)	ITS025	µ	0.08-0.20
Max. PV value	ITS026	N/mm²×m/s	0.45
Mechanical properties
Flexural modulus	ISO178	MPa	4500
Flexural strength	ISO178	MPa	100
Max. static load	ITS027	MPa	60
Max. dynamic load	ITS028	MPa	30
Shore hardness	ISO868	D	79
Physical and thermal properties
Long-term application temperature	ITS029	℃	+180
Short-term application temperature	ITS029	℃	+220
Lowest application temperature	ITS029	℃	-100
Thermal conductivity	ISO22007	W/m/K	0.24
Coefficient of thermal expansion	ISO11359	K^-1×10^-5	7
Flammability	UL94	Class	V0
Electrical properties
Volume resistance	IEC60093	Ω·cm	>10¹³
Surface resistance	IEC60093	Ω	>10¹⁰

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

Standard products

Sleeve bearing

Flange bearing

Thrust washer

EPB25 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-EPB25 plastic bearings is 0.45N/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 EPB25-1).

EPB25_01-Plastic plain bearings PV value.jpg

▊ Load, speed and temperature

CSB-EPB25 allows the Max static load of 60Mpa, The max compressive deformation rate under the max load is listed in Graph EPB25-2, The actual load capacity of bearing is slightly less than 60Mpa, The bearing load is variable against the speed and temperature, Fast speed (Vmax: 1.3m/s) results into higher temperature (Tmax: 180℃) which decreases the load capacity of the bearing. Please refer to the Graph EPB25-3 for such variation.

EPB25_02-Plastic plain bearings load.jpg EPB25_03-Plastic plain bearings load and tepmerature.jpg

▊ Friction factor, wear and shaft material

▊ Friction factor

Graph EPB25-4 shows that the friction factor of CSB-EPB25 is not sensitive to the operation speed and Graph EPB25-5 shows that the friction factor is CSB-EPB25 is decreased along with the loading increasing and become stable when the loading is over 20Mpa. Graph EPB25-6 tells that the friction factor of CSB-EPB25 is also not sensitive to the shaft roughness but we still recommend the shaft roughness to be Ra0.7~0.9.

CSB-EPB25	Dry	Grease	Oil	Water
Friction coef. μ	0.08~0.20	0.09	0.04	0.04

1 EPB25_04-Plastic plain bearings friction and speed.jpg EPB25_05-Plastic plain bearings friction and load.jpg EPB25_06-Plastic plain bearings friction and surface roughness of shaft.jpg

▊ Wearing and shaft material

Graph EPB25-7 and EPB25-8 shows that the wearing of CSB-EPB25 is sensitive to different materials under rotation operation with the loading of 2Mpa. It is suitable for hardened shaft, hardened steel shaft and stainless steel shaft in the rotation operation. Hardened chrome steel shaft is the best choice for CSB-EPB25. The wearing will be decreased as long as the loading increasing.

EPB25_07-Plastic plain bearings wear and shaft materials.jpg EPB25_08-Plastic plain bearings wear and load.jpg

▊ Chemical resistance

CSB-EPB25 is good at chemical resistance against weak acidic medium and various kinds of lubricants.

▊ Water absorption

The moisture absorption of CSB-EPB25 plastic bearings is 0.3% in standard atmosphere. The max. water absorption is 1.6% in water. These values are so low that design changes due to absorption are only necessary in extreme applications.

EPB25_09-Plastic plain bearings moisture absorption.jpg

▊ UV resistance

CSB-EPB25 can maintain its color unchanged when it is exposed into the UV ray. The material performance stays stable.

▊ Installation tolerances

CSB-EPB25 bushing tolerances after pressfit

Diameter [mm]	Inner diameter F10 [mm]	Housing H7 [mm]	Shaft h9 [mm]
>0～3	+0.006～+0.046	0～+0.010	0～-0.025
>3～6	+0.010～+0.058	0～+0.012	0～-0.030
>6～10	+0.013～+0.071	0～+0.015	0～-0.036
>10～18	+0.016～+0.086	0～+0.018	0～-0.043
>18～30	+0.020～+0.104	0～+0.021	0～-0.052
>30～50	+0.025～+0.125	0～+0.025	0～-0.062
>50～80	+0.030～+0.150	0～+0.030	0～-0.074
>80～120	+0.036～+0.176	0～+0.035	0～-0.087
>120～180	+0.043～+0.203	0～+0.040	0～-0.100

CSB-EPB25 Plastic Plain Bearings

Type PDF

Size 584KB

Time 09-2021

No. CSB/CAT.062E

download

1428

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	EPB25 bearings resistance
Alcohol	Resistant
Hydrocarbons	Conditionally resistant
Greases. oils	Resistant
Fuels	Resistant
Diluted acids	Resistant
Strong acids	Conditionally resistant
Diluted alkalis	Resistant
Strong alkalis	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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