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iglide® F - Material data
Materials table
General features
Unit
iglide® F
Test method
Density
g/cm³
1.25
Color
Black
Max. humidity absorption at 73° F/50% R. H.
Wt.-%
1.8
DIN 53495
Max. water absorption
Wt.-%
8.4
Coefficient of surface friction, dynamic, against steel
µ
0.1 - 0.39
p x v value, max. (dry)
psi x fpm
9,700
Mechanical properties
Modulus of elasticity
psi
1,682,000
DIN 53457
Tensile strength at 68° F
psi
37,710
DIN 53452
Compressive strength
psi
14,210
Permissible static surface pressure (68° F)
psi
15, 230
Shore D hardness
84
DIN 53505
Physical and thermal properties
Upper long-term application temperature
°F
284
Upper short-term application temperature
°F
356
Lower application temperature
°F
-40
Heat conductivity
[W/m x K]
0.65
ASTM C 177
Coefficient of thermal expansion (at 73°F)
[K-1 x 10-5 ]
12
DIN 53752
Electrical properties
Specific forward resistance
Ωcm
< 10 3
DIN IEC 93
Surface resistance
Ω
< 10 2
DIN 53482
Permitted p x v values
For iglide® F plastic bushings with 0.0394 inch (1 mm) wall thickness in dry operation against a steel shaft, at 68° F, installed in a steel housing.
When bushings need to be electrically conductive, especially in applications that should keep out static, the iglide® F is the right choice. Moreover, the iglide® F plastic bushings are extremely pressure resistant.
Figure 11.2: Deformation under load and temperatures
Surface pressure
At room temperature, they can handle loads up to 15,225 psi.
Figure 11.2 shows the elastic deformation of iglide® F with radial loads. Under the maximum recommended surface pressure of 15,225 psi, the deformation amounts to less than 3.5%.
A plastic deformation can be negligible up to this pressure load. It is however also dependent on the period of exposure.
Figure 11.3: Maximum recommended surface pressure dependent on the temperature
Temperatures
The ambient temperatures strongly influence the features of plastic bushings. The short-term permitted maximum temperature is 356° F. Long-term operating temperatures should not exceed 284° F.
With increasing temperatures, the compressive strength of iglide® F plstic bushings decreases. Fig. 11.3 clarifies this connection. The wear too rises.
Figure 2.4: Coefficients of friction dependent on the surface speed, p = 108 psi
Friction and wear
Similar to wear resistance, the coefficient of friction also changes with the load. Friction and wear are also dependent to a large degree on the shafting partner. Shafts that are too smooth not only increase the coefficient of friction, they can also increase the wear of the bushings. For iglide® F a ground surface with an average roughness of 20 rms is recommended for the shaft.
Fig. 2.7: Wear, rotating application with different shaft materials, load p = 108 psi, v = 98 fpm
Shaft materials
The graphs show results of tests with different shaft materials conducted with plastic bushings made of iglide® F.
In the lowest load range, the hard-chromed shafts prove to be the most suitable counter partner in rotating applications with iglide® F plastic bushings.
The behavior is different in oscillating movements. With much higher wear values than for rotation, the 303 Stainless Steel shaft and the hard-chromed shaft are better than the Cold Rolled Steel shaft even at 290 psi.
Please contact us in case the shaft material scheduled by you is not included in these diagrams.
Figure 11.10: Influence of moisture absorption of iglide® F plastic bushings
Radioactive rays
iglide® F plastic bushings are radiation resistant up to a radioactive intensity of 3 x 10² Gy.