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 |