EP Plastic Self-lubricating Bearings

EPT Plastic Bearings Universal strongest plastic bearings, to meet the operating temperature of 80 or less most of the workplace.
1: continuous use temperature: -40 ℃ ~ + 80 ℃;
2: Universal strong for use in low-load situations most;
3: Suitable for dry running, maintenance-free, corrosion-resistant;
4: minimize the damage to the shaft;
5: Very low coefficient of sliding friction.

TechnologyMaterialSize table Download

PV Value of Bearings

The max PV value of the EPT series bearing is 0.4N/mm2*m/s which detemines the load capacity of bearing is inversely proportional to the speed. Please refer to the chare for more detailed information (Graph EPT-1).

The Relation of Load,Speed and Temperature

EPT allows the max static load of 35Mpa, The max compressive deformation rate under the max load is listed in Graph EPT-2; The actual load capaxity 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 temperture(Tmax: 80℃) which decreases the load capacity of the bearing. Please refer to the Graph EPT-3 for such variation.

Friction Factor

EPT friction factor is not sensitive to the operation speed and bearing loading(see Graph EPT-4 and Graph EPT-5). The above features are the most common considerations for the bearing material selection.The friction of EPT could be maintained at a relatively lower lebel so that the good wearing features are guaranteed.From the Graph EPT-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.

EPT Dry Grease Oil Water
Friction coefficient μ 0.05~0.15 0.09 0.04 0.04
Wearing and shaft material

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

Chemical Resistance

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

Water Absorbability

The water absorb rate of EPT is 0.2% under the atmospheric pressure while it is 1.2% when the material is immerged into water. With its low water absorbability, the material is suitable for humid environment applications.

UV Resistance

EPT 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.

Bearing Installation

The Interfit Tolerance

d mm² 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

Material

Material Properties Table
Common Capability Unit EPT Testing Method
Density g/cm³ 1.46  
Color   Black gray  
Max.water absorption,23℃/ 50% [%weight] 0.2 DIN 53495
Max.water absorption [%weight] <1.2  
Dynamic friction /steel μ 0.05-0.15  
Max.PV(dry) MPa•m/s 0.4  
Mechanical behavior
E-module MPa 2,300 DIN 53457
Tensile strength,20℃ MPa 80 DIN 53452
Compressive strength MPa 65  
Max.static pressure of the surface,20℃ MPa 35  
Shore D hardness   70 DIN 53505
Physical and thermal properties
Continuous work tempreature +80  
short-time work tempreature +120  
Minimum operating temperature -40  
Thermal conductivity W/m•K 0.2 ASTM C 177Lin
Thermal expansion,23℃ K 7 DIN 53752
Conductive propertiesK-1•10-5
Volume resisticity Ωcm >1012 DIN IEC 93
Surface resisticity Ω >1015 DIN 53482

EPT
Universal Bearings

It can meet most applications working temperature of 80 degrees below, excellent wear resistance...

READ MORE >>

EPG
High load-bearing

Applications ace high loads. As the perfect combination of fiber reinforced material and lubrication.

READ MORE >>

EPH
Corrosion-resistant bearings

High temperature of 200 degrees and a low coefficient of friction material...

READ MORE >>

EPX
High-temperature
bearings

High temperature of 250 degrees of self-lubricating material. High chemical ...

READ MORE >>

EPJ
High-speed bearings

Low coefficient of friction and high wear resistance perfect combination. Rotary, linear and oscillating...

READ MORE >>

EPS
Tetrafluoroethylene modified bearing

High-speed low-cost solution. Lower temperature of 260 degrees ...

READ MORE >>