iglide® G300 plastic bushings: Material data
Materials table
| General features | Unit | iglide® G300 | Test method |
|---|---|---|---|
| Density | g/cm3 | 1.45 | |
| Color | dark gray | ||
| Max. humidity absorption at 73° F/50% R. H. | Wt.-% | 0.7 | DIN53495 |
| Max. water absorption | Wt.-% | 4.0 | |
| Coefficient of surface friction, dynamic, against steel | µ | 0.08-0.15 | |
| p x v value, max. (dry) | psi x fpm | 12,000 | |
| Mechanical properties | |||
| Modulus of elasticity | psi | 1,131,000 | DIN53457 |
| Tensile strength at 68° F | psi | 30,450 | DIN53452 |
| Compressive strength | psi | 11,310 | |
| Permissible static surface pressure (68° F) | psi | 11,600 | |
| Shore D hardness | 81 | DIN53505 | |
| Physical and thermal properties | |||
| Max. long-term application temperature | °F | 266 | |
| Max. short-term application temperature | °F | 428 | |
| Min. application temperature | °F | -40 | |
| Thermal conductivity | [W/mxK] | 0.24 | ASTM C 177 |
| Coefficient of thermal expansion (at 73 °F) | [K-1x10-5] | 9 | DIN 53752 |
| Electrical properties | |||
| Specific volume resistance | Ωin | >1013 | DIN IEC 93 |
| Surface resistance | Ω | >1011 | DIN 53482 |
Click to enlarge
Permissible p x v values
Permissible p x v values for iglide® G300 plastic bushings running dry against a steel shaft at 68°F.
The elastic deformation of iglide® G300 under radial loads.
Compressive Strength
The graph (left) shows the elastic deformation of iglide® G300 plastic bushings under radial loads. Under the maximum recommended surface pressure of 11,600 psi, the deformation amounts to less than 5%. A plastic deformation can be ignored until a pressure of about 14,500 psi. It is, however, also dependent on the period of exposure.
Permissible surface speeds
iglide® G300 plastic bushings were developed for low to medium surface speeds. The maximum values stated in the table (left) can be attained only with low pressure loads. At the specified speeds, an increase in temperature up to the long-term permissible value can occur due to friction. In practice, these limits are not always reached due to the alternating effect of influences.
| fpm | Rotating | Oscillating | Linear |
|---|---|---|---|
| Continuous | 196 | 137 | 787 |
| Short-term | 393 | 275 | 984 |
Temperatures
Ambient temperatures influence the properties of iglide® G300 plastic bushings.
The maximum short-term permissible temperature is 428°F, and this enables the iglide® G300 bushings to be used in applications where they are used without any additional load: for instance in a paint-drying process. With increasing temperatures, the compressive strength of iglide® G300 plastic bushings decreases. The graph (left) illustrates this connection. Under the long-term permissible application temperature of 266°F, the permissible surface pressure is 5,800 psi.
Temperature can also have an influence on wear. An iglide G300® bushing's wear increases with rising temperatures and the influence can especially be seen from temperatures of 248°F upwards.
| iglide® G300 | Application temperature |
|---|---|
| Lower | -40 °F |
| Upper, long-term | +266 °F |
| Upper, short-term | +428 °F |
| Additional axial securing | +212 °F |
Friction and wear
Just like wear resistance, the coefficient of friction - or µ - also changes dependent on the load. Interestingly, the coefficient of friction decreases with increasing load, whereas an increasing surface speed causes he coefficient of friction to rise. This correlation confirms the extraordinary capacity of iglide® G300 plastic bushings for high loads and low speeds.
Very smooth shafts increase the coefficient of both friction and wear of the bearing. A smoothed surface with an average surface finish Ra = 32 rms is best suited for iglide® G300 (see graph left).
| iglide® G300 | Dry | Grease | Oil | Water |
|---|---|---|---|---|
| Coefficients of friction µ | 0.08-0.15 | 0.09 | 0.04 | 0.04 |
Wear, rotating application with different shaft materials, load p = 145 psi, v = 59 fpm
Shaft materials
The graphs (left) display a summary of tests conducted with iglide® G300 using different shaft materials. It can be seen that iglide® G300 can be combined with many different shaft materials. Low cost machined steel and St37 shaft materials are proven to be the most suitable for low loads.
It is important to note that, with increasing loads, the recommended hardness of the shaft increases. Soft shafts tend to wear more and increase the overall wear of the system if loads exceed 290 psi. Note that the wear rate is markedly reduced with hardened shafts.
The comparison of rotating versus pivoting movements shows that iglide® G300 wears less in pivoting applications. The higher the load, the greater the difference. This means that iglide® G300 plastic bushings can be used for pivoting applications involving far more than the specified maximum load of 11,600 psi. So, for high loads, the use of hardened shafts is strongly recommended.
Besides the shaft materials presented here, many others were tested. Please contact us in case the shaft material you would like to use is not included here.
Installation tolerances
iglide® G300 plastic bushings are standard for shafts with h-tolerance (recommended minimum h9). After the installation in a housing bore with H7 tolerance, the inner diameter of the bushing automatically adjusts to the E10 tolerance.
| Diameter d1 [inch] | Shaft h9 [inch] | iglide® G300 E10 [inch] |
|---|---|---|
| Up to 0.019685 | 0 - 0.0009843 | +0.0005512 + 0.0021259 |
| > 0.1181 to 0.2362 | 0 - 0.0011811 | +0.0007874 + 0.0026772 |
| > 0.2362 to 0.3937 | 0 - 0.0014173 | +0.0009843 + 0.0032677 |
| > 0.3937 to 0.7087 | 0 - 0.0016929 | +0.0012598 + 0.0040157 |
| > 0.7087 to 1.1811 | 0 - 0.0020472 | +0.0015748 + 0.0048819 |
| > 1.1811 to 1.9685 | 0 - 0.0024409 | +0.0019685 + 0.0059055 |
| > 1.9685 to 3.1496 | 0 - 0.0029134 | +0.0023622 + 0.0070866 |
| > 3.1496 to 4.7244 | 0 - 0.0034252 | +0.0028346 + 0.0083464 |
| > 4.7244 | 0 - 0.0039370 | +0.0033465 + 0.0096457 |
Chemical resistance
iglide® G300 plastic bushings have excellent resistance against chemicals. They are also resistant to most lubricants.
iglide® G300 is not affected by most weak acids.
The moisture absorption of iglide® G300 bushings amounts to about 1% in standard atmospheric conditions. The saturation limit submerged in water is 4%. This must be taken into account for these types of applications.
Radioactive rays
iglide® G300 plastic bushings are radiation resistant up to a radioactive intensity of 3 x 10² Gy.
UV-resistant
iglide® G300 plastic bushings are permanently resistant against UV rays.
Vacuum
iglide® G300 plastic bushings outgas in a vacuum. Use in a vacuum environment is only possible for dehumidified bushings.
| Medium | Resistance |
|---|---|
| Alcohol | + to 0 |
| Hydrocarbons | + |
| Greases, oils without additives | + |
| Fuels | + |
| Weak acids | 0 to - |
| Strong acids | - |
| Weak alkalines | + |
| Strong alkalines | 0 |
| + resistant 0 conditionally resistant - not resistant |
Electrical properties
iglide® G300 plastic bushings are electrically insulating.
| Specific forward resistance | Surface resistance |
|---|---|
| > 1013 Ωcm | > 1011 Ω |