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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.


plastic bushings deformation 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.


Maximum surface speed

fpm Rotating Oscillating Linear
Continuous 157 118 590
Short-term 295 216 1181

Permitted surface speeds

The maximum permitted surface speeds are based on the operation period and the type of motion. A bushing is the most stressed in long-term rotating motions. Here the maximum speed for the iglide® F plastic bushing is 118 fpm.

The maximum values specified in Table 11.2 are attained only at minimum pressure loads. In practice these limit values are not often attained due to interactions.


surface pressure on plastic bushings 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.

Temperature limits

iglide® F Application temperature
Lower - 40 °F
Upper, long-term + 284 °F
Upper, short-term + 356 °F
Additional axial securing + 221 °F


plastic bushing coefficients of friction 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.

Coefficients of friction for iglide® F against steel
(Shaft finish = 40 rms, 50 HRC)

iglide® F Dry Grease Oil Water
Coefficients of friction µ 0.08 - 0.15 0.09 0.04 0.04

plastic bushing load Figure 2.5: Coefficients of friction dependent on the load, v = 0.01 m/s
shaft surface Figure 11.6: Coefficients of friction dependent on the shaft surface (1050 hard chromed)

shaft materials for plastic bushings 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.

plastic bushings in rotational applications Figure 11.8: Wear with various shaft materials in rotational applications, as a function of the pressure.
plasting bushings with shaft materials Figure 11.9: Wear with different shaft materials, oscillating and rotating movement p = 290 psi

Important tolerances for iglide® F plastic bushings according to ISO 3547-1 after the press-fit.

Diameter
d1 [inch]
Shaft h9
[inch]
iglide® F
D11 [inch]
Up to 0.019685 0 - 0.0009843 0.0007874 - 0.0031496
> 0.1181 to 0.2362 0 - 0.0011811 0.0011811 - 0.0041339
> 0.2362 to 0.3937 0 - 0.0014173 0.0015748 - 0.0051181
> 0.3937 to 0.7087 0 - 0.0016929 0.0019685 - 0.0062992
> 0.7087 to 1.1811 0 - 0.0020472 0.0025591 - 0.0076771
> 1.1811 to 1.9685 0 - 0.0024409 0.0031496 - 0.0094488

Installation tolerances

iglide® F plastic bushings are standard bushings for shafts with h-tolerance (recommended minimum h9).

After the installation in a housing bore with the tolerance H7, the inner diameter of the bushing automatically adjusts to the D11 tolerance.


Medium Resistance
Alcohol + to 0
Hydrocarbons, chlorinated +
Greases, oils, without additives +
Fuels +
Weak acids 0 to -
Strong acids -
Weak alkaline +
Strong alkaline + to 0
+ resistant      0 conditionally resistant      - non-resistant

plastic bushings moisture absorbtion Figure 11.10: Influence of moisture absorption of iglide® F plastic bushings


Electrical properties

Specific forward resistance < 103 Ωcm
Surface resistance < 102 Ω

Chemical resistance

iglide® F plastic bushings have a good resistance against chemicals. The particularly high resistance to lubricants is to be highlighted, even at high temperatures (around 248° F). Hence the iglide® F plastic bushings are particularly suitable for applications that call for lubrication necessitated by other parts.

The iglide® F is not affected by most weak organic and inorganic acids.

The moisture absorption of iglide® F plastic bushings amounts to about 1.8% in standard climatic conditions. The saturation limit in water is 8.4%. This should be considered according to application conditions.

Radioactive rays

iglide® F plastic bushings are radiation resistant up to a radioactive intensity of 3 x 10² Gy.

UV-resistant

iglide® F plastic bushings are permanently resistant against UV rays.

Vacuum

In application in vacuum, the potentially existent moisture content is degassed. For this reason only the dry iglidur® F plastic bushings are suitable for vacuum.

Electrical properties

In contrast to most other iglide® materials, the iglide® F plastic bushings are electrically conductive.