EPB8 Plastic plain bearings - CSB® Plastic Bearing Technology

Product properties

● A special material for the application in water. The wear resistance could even be improved in water. It is able to be continously operated in a chemical liquid with temperature of 200 ℃

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

● Good wear resistance under high load

● Suitable for underwater operation

● Good chemical resistance

Material properties	Standard	Unit	CSB-EPB8
General properties
Color	-	-	Dark grey
Density	ISO1183	g/cm³	1.55
Max. moisture absorption, 50%RH	ISO62	%	0.1
Max. water absorption	ISO62	%	0.1
Coefficient of sliding friction(steel)	ITS025	µ	0.07-0.18
Max. PV value	ITS026	N/mm²×m/s	0.80
Mechanical properties
Flexural modulus	ISO178	MPa	8000
Flexural strength	ISO178	MPa	150
Max. static load	ITS027	MPa	85
Max. dynamic load	ITS028	MPa	47
Shore hardness	ISO868	D	82
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	0.50
Coefficient of thermal expansion	ISO11359	K^-1×10^-5	5
Flammability	UL94	Class	V0
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

EPB8 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-EPB8 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 EPB8-1).

EPB8_01-Plastic plain bearings PV value.jpg

▊ Load, speed and temperature

CSB-EPB8 allows the Max static load of 85Mpa, The max compressive deformation rate under the max load is listed in Graph EPB8-2, The actual load capacity of bearing is slightly less than 85Mpa, The bearing load is variable against the speed and temperature, Fast speed (Vmax: 1.2m/s) results into higher temperature (Tmax: 200℃) which decreases the load capacity of the bearing. Please refer to the Graph EPB8-3 for such variation.

EPB8_02-Plastic plain bearings load.jpg EPB8_03-Plastic plain bearings load and tepmerature.jpg

▊ Friction factor, wear and shaft material

▊ Friction factor

Graph EPB8-4 shows that the friction factor of CSB-EPB8 is not considerably affected by the operation speed when the loading is stable. The special embedded lubricant helps the material to be suitable for the underwater operation. When the operation speed keeps stable and the loading is over 20Mpa, the friction factor of CSB-EPB8 is not variable along with the loading change (See Graph EPB8-5). The shaft roughness highly affects the friction factor but this affecting will be stable when the shaft roughness is better than Ra0.7 (See Graph EPB8-6). The recommended shaft roughness is Ra0.2 to Ra0.3.

CSB-EPB8	Dry	Grease	Oil	Water
Friction coef. μ	0.07~0.18	0.09	0.04	0.04

EPB8_04-Plastic plain bearings friction and speed.jpg EPB8_05-Plastic plain bearings friction and load.jpg EPB8_06-Plastic plain bearings friction and surface roughness of shaft.jpg

▊ Wearing and shaft material

The rotation test against different shaft material showing in Graph EPB8-7 and Graph EPB8-8 induces that the best mating shaft material for the material CSB-EPB8 is hardened chrome steel shaft but not stainless steel shaft. CSB-EPB8 is best for stainless steel and hardened chrome steel shaft in oscillation operation and especially the hardened chrome steel shaft is the best choice in rotation operation.

EPB8_07-Plastic plain bearings wear and shaft materials.jpg EPB8_08-Plastic plain bearings wear and load.jpg

▊ Chemical resistance

The Chemical Resistance of CSB-EPB8 is fairly good against most of Acid and Alkalis.

▊ Water absorption

The moisture absorption of CSB-EPB8 plastic plain bearings is 0.1% in standard atmosphere. The max. water absorption is 0.1% in water. These values are very low, CSB-EPB8 plastic palin bearings is very well suited for used in water.

EPB8_09-Plastic plain bearings moisture absorption.jpg

▊ UV resistance

Disintegration could be possible for the material CSB-EPB8 after long period of exposing under the UV ray and therefore the compressive strength will be reduced.

▊ Installation tolerances

CSB-EPB8 Tolerances after pressfit

Diameter [mm]	CSB-EPB8 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-EPB8 Plastic Plain Bearings

Type PDF

Size 585KB

Time 09-2021

No. CSB/CAT.062E

download

1475

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	EPB8 bearings resistance
Alcohol	Resistant
Hydrocarbons	Resistant
Greases. oils	Resistant
Fuels	Resistant
Diluted acids	Conditionally 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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