HDPE / PP / UPE Plastic Bearings , Anti-Acid And Anti-Alkali Plastic Bearings
TOP-16 plastic bearing.pdf
HDPE,PP,UPE(UHMWPE) are approved can be used in faintish acid and alkali environment (30% CuCl2 solution and 30% NAOH solution is tested ok). Such bearings can be operated in liquid and contamination sensitive environments as acid/alkali/salt/solvent/oil/gas/seawater, and have general performance of lubrication and maintenance free, none magnetism, anti-rust and eroded of plastic bearings. But these bearings have not strong mechanical strength, and easy to be out of shape, so couldn't be used in heavy load and high-speed application. Among these 3 material, UPE have more excellent strength and low friction and could be used to lower temperature (lowest to -150℃). Generally the rings and cage were made with HDP PP or UPE, balls were made with glass stainless or ceramic.
The material of rings and cage: HDP, PP, UPE material.
The material of Balls: Glass Stainless, Ceramic material.
| Basic properties of staple engineer plastic | ||||||||
| Material | HDPE | PP | POM | PA66 | PVDF | PPS | PTFE | PEEK |
| Long-time working temp. | 90 | 100 | 110 | 100 | 150 | 230 | 260 | 280 |
| Density | g/cm3 | 0.91 | 1.42 | 1.14 | 1.77 | 1.35 | 2.18 | 1.32 |
| Ball indentation hardness | 50 | 80 | 170 | 170 | 80 | 190 | 30 | |
| Tensile stress | 25 | 30 | 70 | 80 | 50 | 75 | 25 | 95 |
| Sliding friction coefficient | 0.29 | 0.3 | 0.34 | 0.35-0.42 | 0.3 | 0.08-0.1 | 0.3-0.38 | |
| Melted temperature | 130 | 165 | 175 | 260 | 172 | 280 | 327 | 343 |
| Short-time highest application temperature | 90 | 140 | 150 | 170 | 150 | 260 | 260 | 300 |
| Coet of Inear expansion (10^-5/K) | 13-15 | 17 | 10 | 8 | 13 | 5 | 12 | 5 |
| Dielectric constant at 1 Mhz(10^6HZ) | 2.4 | 2.25 | 3.7 | 3.6-5 | 8 | 2.1 | 3.2-3.3 | |
| Volume resisrivity (Ω·cm) | >10^15 | >10^24 | >10^14 | 10^13 | 10^12 | >10^13 | 10^14 | 10^13 |
| flammability UL94 | + | + | - | (+) | (+) | - | + | + |
| Anti-weathering | - | - | - | - | - | - | + | - |
| Note: + =resistant; (+) =partly resistant; - =non-resistant | ||||||||
| Chemical properties of Engineer plastic | |||||||||
| Chemical Composition | Material | ||||||||
| PI | PEEK | PTFE | PVDF | PA66 | POM | PP | HDPE | ABS | |
| Acrtate | + | + | + | (+) | (+) | + | + | (+) | + |
| Formic acid (10% water) | + | + | + | + | - | - | + | + | + |
| Ammonia (10% water) | - | + | + | + | + | (+) | + | + | + |
| Aether | + | + | + | + | + | + | + | ||
| Petrol | + | + | + | + | + | + | (+) | (+) | (+) |
| Bori acid (10% water) | + | + | (+) | + | + | + | + | + | |
| Aminoform | + | + | + | - | - | (+) | - | - | |
| Aeti aid 100% | (+) | - | + | - | - | + | + | - | |
| Aceti aid (10% water) | + | + | + | - | (+) | + | + | + | |
| HF | + | - | - | + | + | (+) | |||
| Formaldehyde aqu (30% water) | + | + | + | + | - | + | + | + | |
| Glycerin | + | + | + | + | + | + | + | ||
| Iodine, Glycol | + | + | (+) | - | (+) | + | + | (+) | |
| K2Cr2O7 (10% water) | + | + | + | - | + | + | + | ||
| KMnO4 (1% water) | + | + | + | + | - | (+) | + | + | (+) |
| 2-Hydronyprpionic 10% | + | + | + | - | - | + | + | - | |
| 2-Hydronyprpionic 90% | + | + | + | + | + | (+) | + | + | + |
| Nad (10% water) | + | + | + | + | + | + | + | + | + |
| NaNO3 (10% water) | + | + | + | + | + | + | + | + | |
| NaOH (50% water) | + | + | + | + | - | + | + | + | |
| NaOH (5% water) | + | + | + | - | + | + | |||
| Oxalic (10% water) | + | + | + | + | (+) | (+) | + | + | + |
| Tetracarp | + | + | + | (+) | + | - | - | (+) | |
| H3PO3 100% | + | + | - | + | + | ||||
| H3PO4 (10% water) | + | + | + | - | - | + | + | ||
| NHO3 (2% water) | + | + | + | + | - | - | + | + | + |
| HCL (2% water) | + | + | + | (+) | - | - | + | + | + |
| H2SO4 98% | - | + | - | - | + | (+) | - | ||
| Soap liquid | + | + | + | + | + | + | |||
| Alkaliliquid (10% water) | + | + | + | + | + | + | + | ||
| Toluene | + | + | + | + | + | + | + | (+) | - |
| Water, cold | + | + | + | + | + | + | + | + | + |
| Water, hot | + | + | + | (+) | - | + | + | + | |
| H2O2 (30% water) | (+) | + | + | - | - | + | + | + | |
| H2O2 (0.5% water) | + | + | + | - | (+) | + | + | + | |
| Asphalt | + | + | (+) | + | (+) | (+) | |||
| Note: + =resistant; (+) =partly resistant; - =non-resistant | |||||||||
