PI Resistant To Elevated Temperatures Plastic Bearings
PI Plastic Bearings could work at 300℃ in long time. Moreover PI Resistant To Elevated Temperatures Plastic Bearings have excellent anti-corrosion performance, could be used in strong
acid and alkali environment. So generally PI Resistant To Elevated Temperatures Plastic Bearings are used to manufacture bearings to realize precision running in
rigor environment.
Generally the rings made with PEEK or PI, Cage with PTFE, PEEK or
PI, and ball with ZrO2 or Si3N4.As the material is expensive, the costs are high.
As newly developing engineering plastic material, PI have been
approved have the strongest mechanical strength and could endure
the highest temperature among all the plastic 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 | |
