UPE Plastic Bearings , Anti-Acid And Anti-Alkali Plastic Bearings
Among these 3 material HDPE, PP and UPE, UPE have more excellent
strength and low friction and could be used to lower temperature
(lowest to -150℃).
UPE plastic bearings could be used for long-time working
temperature on 110C, The ball indentation hardness is 170HRC, the
tensile stress is 70.
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). Generally the rings and cage were made with HDP PP or
UPE, balls were made with glass stainless or ceramic.
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 UPE
plastic 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.
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 | |