EPB25 Plastic Plain Bearings

Product Detail

EPB25 Plastic Plain Bearings

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.

The Material Data Sheet

Typical Item	Standard	Unit	CSB-EPB25
Density	ISO1183	g/cm³	1.44
Color			Yellow
Dynamic friction /steel(dry)			0.08-.020
Max. PV (dry)		N/mm²×m/s	0.45
Max. roatating velocity		m/s	1.30
Max. oscillating velocity		m/s	1.00
Max. linear velocity		m/s	4.00
Tensile strength	ISO527	MPa	55
Compressive strength (Axial)		MPa	60
E-module	ISO527	MPa	2200
Max. static pressure of the surface, 20?		MPa	60
Shore hardness	ISO868	D	80
Continuous work temperature			-100/180
Short-time work temperature			-100/210
Thermal conductivity	ASTME1461	W/m×k	0.24
Linear coef. of thermal expansion	ASTMD696	K-1×10-5	7
Moisture absorption RH50/23?	ASTMD570	%	0.3
Max. water absorption, 23?		%	1.6
Flammability	UL94		V0
Volume resistivity	IEC60093	Ocm	>1013
Surface resistivity	IEC60093	O	>1010

PV Value of Bearings

The max PV value of the CSB-EPB25 series bearing 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).



The Relation of 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.



The Friction Factor,Wearing and shaft material


Friction Factor
 Graph EPB25-4 shows that the friction factor of CSBEPB25 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	0.05~0.15	0.09	0.04	0.04




Wearing and shaft material

Graph EPB25-7 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, high speed steel shaft and hardened chrome steel shaft in the rotation operation. Hardened chrome steel shaft is the best choice for CSB-EPB25(Graph EPB25-8). The wearing will be decreased as long as the loading increasing.



Chemical Resistance

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

Water Absorbability

The water absorb rate of CSB-EPB25 is 0.3% under the atmospheric pressure while it is 1.6% when the material is immerged into water. The application environment has to be considered because of its water absorb properties.



UV Resistance

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

Bearing Installation

CSB-EPB25 The Interfit Tolerance

Diameter mm	Tolerance after fit E10	Fit Housing H7	Fit Shaft h9
>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