EPB8 Plastic Plain Bearings

EPB8 Plastic Plain Bearings
Product Details

EPB8 Plastic Plain Bearings

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.

The Material Data Sheet

Typical Item

Standard

Unit

CSB-EPB8

   Density

ISO1183

g/cm³

1.60

   Color



Grey

   Dynamic friction /steel(dry)



0.07-0.18

   Max. PV (dry)


N/mm²×m/s

0.8

   Max. roatating velocity


m/s

1.2

   Max. oscillating velocity


m/s

0.8

   Max. linear velocity


m/s

4.0

   Tensile strength

ISO527

MPa

135

   Compressive strength (Axial)


MPa

80

   E-module

ISO527

MPa

11000

   Max. static pressure of the surface, 20?


MPa

75

  Shore hardness

ISO868

D

82

   Continuous work temperature


-40/200

   Short-time work temperature


-40/260

   Thermal conductivity

ASTME1461

W/m×k

0.5

   Linear coef. of thermal expansion

ASTMD696

K-1×10-5

5

   Moisture absorption RH50/23?

ASTMD570

%

<0.1

   Max. water absorption, 23?
%<0.1

   Flammability

UL94


V0

   Volume resistivity

IEC60093

Ocm

>105

   Surface resistivity

IEC60093

O

>105

PV Value of Bearings

The max PV value of the CSB-EPB8 series bearing 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).

The Relation of Load, Speed and Temperature

CSB-EPB8 allows the Max static load of 75Mpa, 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 75Mpa, 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.

The Friction Factor,Wearing 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


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. Graph EPB8-8 tells that 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.

Chemical Resistance

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

Water Absorbability

The water absorb rate of CSB-EPB8 is less than 0.1% under the atmospheric pressure while it is less than 0.1% when the material is immerged into water. The material performance and dimensions of the material is stabilized for the applications under humid environment or even in the water

UV Resistance

Disintegration could be possible for the material CSBEPB8 after long period of exposing under the UV ray and therefore the compressive strength will be reduced.

Bearing Installation

CSB-EPB8 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

CSB Plastic is one of the leading China epb8 plastic plain bearings manufacturers and suppliers, and also a professional epb8 plastic plain bearings factory and company, we are always at your services.

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