EP Plastic Self-lubricating Bearings
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EPH Plastic Bearings
High temperature and good chemical resistance material. Continuous use at 200 degrees, is also suitable for use in wet environments in even chemical liquid. Rigid shaft material used in conjunction with good.
1: continuous use temperature: -40 ℃ ~ + 200 ℃;
2: For the majority of high-load situations;
3: Suitable for dry running, maintenance-free;
4: good chemical resistance;
5: Suitable wet environments.
TechnologyMaterialSize table Download
The max PV value of the EPH series bearing is 1.4N/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 EPH-1).
EPH allows the max static load of 90Mpa, The max compressive deformation rate under the max load is listed in Graph EPH-2; The actual load capaxity of bearing is slightly less than 90Mpa, The bearing load is variable against the speed and temperature, Fast speed( Vmax: 1.0m/s) results into higher temperture(Tmax: 200℃) which decreases the load capacity of the bearing. Please refer to the Graph EPH-3 for such variation.
Friction factor will be slightly decreased along with the speed increasing under certain loading of the rotation operation(See Graph EPH-4) and it will be slightly decreased along with the loading increasing under certain speed of the rotation operation especially when the loading is less than 30Mpa. Graph EPH tells that the friction of the EPH is not changed at all when the shaft roughness is between Ra0.1 to Ra0.4 and will be considerably increased when the shaft roughness is over Ra0.4. So the recommended shaft roughness is Ra0.1-Ra0.4.
| EPH | Dry | Grease | Oil | Water |
| Friction coefficient μ | 0.07~0.20 | 0.09 | 0.04 | 0.04 |
Graph EPH-7 shows that EPH is suitable for most of the shaft materials under low loading rotation operation and it is good for hardened carbon steel shaft under high loading rotation operation(see Graph EPH-7), From Graph EPH-8, we can also read that EPH is suitable for stainless steel shaft under oscillation operation and goog for hot rolled canbon steel and hardness carbon steel shaft under rotation operation.
The Chemical Resistance of EPH is fairly good against most of Acid and Alkalis.
The water absorb rate of EPH is 0.1% under the atmospheric pressure while it is 0.3% when the material is immerged into water. The material performance and dimensions of the material is stabilized for the applications under humid environment.
Disintegration could be possible for the material EPH after long period of exposing under the UV ray and therefore the compressive strength will be reduced.
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 |
| ＞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 | EPH | Testing Method |
| Density | g/cm³ | 1.65 | |
| Color | Grey | ||
| Max.water absorption,23℃/ 50% | [%weight] | 0.1 | DIN 53495 |
| Max.water absorption | [%weight] | ＜3 | |
| Dynamic friction /steel | μ | 0.07-0.20 | |
| Max.PV（dry） | MPa•m/s | 1.37 | |
| Mechanical behavior | |||
| E-module | MPa | 12,500 | DIN 53457 |
| Tensile strength,20℃ | MPa | 175 | DIN 53452 |
| Compressive strength | MPa | 81 | |
| Max.static pressure of the surface,20℃ | MPa | 90 | |
| Shore D hardness | 87 | DIN 53505 | |
| Physical and thermal properties | |||
| Continuous work tempreature | ℃ | +200 | |
| short-time work tempreature | ℃ | +240 | |
| Minimum operating temperature | ℃ | -40 | |
| Thermal conductivity | W/m•K | 0.6 | ASTM C 177 |
| Thermal expansion,23℃ | K | 4 | DIN 53752 |
| Conductive propertiesK-1•10-5 | |||
| Volume resisticity | Ωcm | ＞104 | DIN IEC 93 |
| Surface resisticity | Ω | ＞105 | DIN 53482 |
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