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iglide® H - Material data

Materials table

General features Unit iglide® H Test method
Density g/cm³ 1.71
Color Gray
Max. moisture absorption at 73° F/50% R. H. Wt.-% < 0.1 DIN 53495
Max. moisture absorption Wt.-% 0.3
Coefficient of surface friction, dynamic, against steel µ 0.07 - 0.2
p x v value, max. (dry) psi x fpm 39,000

Mechanical properties
Modulus of elasticity psi 1,813,000 DIN 53457
Tensile strength at 68° F psi 25,380 DIN 53452
Compressive strength psi 11,750
Permissible static surface pressure (68° F) psi 13,050
Shore D hardness 87 DIN 53505

Physical and thermal properties
Upper long-term application temperature °F 392
Upper short-term application temperature °F 464
Lower application temperature °F -40
Thermal conductivity [W/m x K] 0.6 ASTM C 177
Coefficient of thermal expansion (at 73° F) [K-1 x 10-5 ] 4 DIN 53752

Electrical properties
Specific forward resistance Ωcm < 10 5 DIN IEC 93
Surface resistance Ω < 10 2 DIN 53482


Permitted p x v values

For iglide® H plastic bushings with 0.039 inch wall thickness in dry operation against a steel shaft, at 68° F, installed in a steel housing.

iglide® H is a fiber-reinforced thermoplastic material especially developed for applications in high atmospheric humidity or under water. Plastic bushings made of iglide® H can be used completely free of lubrication; in application in the wet area, the surrounding media acts as additional lubricant.


plastic bushings deformation Figure 12.2: Deformation under load and temperatures

Surface pressure

Figure 12.2 shows the elastic deformation of iglide® H with radial loads. Under the maximum recommended surface pressure of 13,050 psi, the deformation amounts to about 2.5%.


Maximum surface speed

fpm Rotating Oscillating Linear
Continuous 196 137 590
Short-term 295 216 787

Permitted surface speeds

The maximum permitted surface speed is dependent on whether the temperature in the bushing location rises strongly or not. iglide® H is suited in dry operation for a maximum surface speed of 196 fpm (rotating) and 590 fpm (linear) respectively. Linear movements enable higher surface speeds, as a large area of the shaft contributes to the cooling.


surface pressure on plastic bushings Figure 12.3: Maximum recommended surface pressure dependent on the temperature

Temperatures

iglide® H is an extremely temperature-resistant material. With a short-term permitted maximum temperature of 464° F, the iglide® H plastic bushings can be subjected, for example, to a paint drying process at low loads.

With increasing temperatures, the compressive strength of iglide® H plastic bushings decreases. Fig. 12.3 clarifies this connection. The temperatures prevailing in the bushing system also have an influence on the bushing wear. The wear rises with increasing temperatures. With increasing temperature in the range between room temperature and 302° F, compressive strength and wear, if only to a minor degree, drop for the iglide® H.

Temperature limits

iglide® H Application temperature
Lower - 40 °F
Upper, long-term + 392 °F
Upper, short-term + 464 °F
Additional axial securing + 248 °F


plastic bushings friction surface speed Figure 2.4: Coefficients of friction dependent on the surface speed, p = 108 psi

Friction and wear

Similar to wear resistance, the coefficient µ of friction also changes with the load. Notice that the coefficient of friction µ is slightly reduced with the increase in the surface speed, when the pressure stays the same.

Since the shaft material also has a large effect on the friction and wear, correct shaft selection is important for iglide® H. Shafts that are smoother than 4 rms increase the coefficient of friction. For applications with high loads, we recommend hardened and ground surfaces with an average roughness range of 12-16 rms.

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

iglide® H Dry Grease Oil Water
Coefficients of friction µ 0,07 - 0,2 0,09 0,04 0,04

plastic bushing load Figure 2.5: Coefficients of friction dependent on the load, v = 1.97 fpm
plasting bushings with shaft materials Figure 12.7: Coefficients of friction dependent on the shaft surface

Fig. 2.7: Wear, rotating application with different shaft materials, load p = 108 psi, v = 98 fpm

Shaft materials

The graph displays a summary of the results of tests with different shaft materials conducted with plastic bushings made of iglide® H. The results clearly show that in rotating and oscillating applications the correct shaft selection is critical. For rotating applications, shafts made of 1050 hardened, ground steel and HR Carbon steel show the best wear values, the 3030 stainless steel shaft is best suited for oscillating movements. Also, hard chromed shafts with iglide® H plastic bushings are only recommended for low loads.

Please contact us in case the shaft material scheduled by you is not included in this diagram.

plastic bushings in rotational applications Figure 12.9: Wear with various shaft materials in the rotating operation dependent on the load
plasting bushings load Figure 12.10: Wear in pivoting and rotating applications at constant load with various shaft materials, p = 290 psi

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

Diameter
d1 [mm]
Shaft h9
[mm]
iglide® H
F10 [mm]
Up to 0.019685 0 - 0.0009842 +0.0002362 + 0.0018110
> 0.118 to 0.236 0 - 0.0011811 +0.0003937 + 0.0022835
> 0.236 to 0.394 0 - 0.0014173 +0.0005118 + 0.0027953
> 0.394 to 0.709 0 - 0.0016929 +0.0006299 + 0.0033858
> 0.709 to 1.181 0 - 0.0020472 +0.0007874 + 0.0040945
> 1.181 to 1.969 0 - 0.0024409 +0.0009843 + 0.0049213
> 1.969 to 3.150 0 - 0.0029134 +0.0011811 + 0.0059055

Installation tolerances

iglide® H plastic bushings are press-fit bushings 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 F10 tolerance.


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


Electrical properties

Specific forward resistance < 105 Ωcm
Surface resistance < 102 Ω

Chemical resistance

iglide® H plastic bushings have a good resistance against chemicals. Hence even aggressive chemicals can act as lubricant.

The iglide® H plastic bushings cannot withstand hot, oxidizing acids.

The humidity absorption of iglide® H plastic bushings is about 0.1% in standard climatic conditions. The saturation limit in water is 0,3%. iglide® H does not soak and is therefore very well suited for application in wet environment.

Radioactive rays

iglide® H withstands both the neutron and gamma particle radiations without noticeable loss to its excellent mechanical properties. iglide® H plastic bushings are radiation resistant up to a radioactive intensity of 2 x 10² Gy.

UV-resistant

iglide® H plastic bushings are only conditionally resistant to UV rays. Under the influence of weathering, the surface of iglide® H becomes harsher, and the compressive strength of the material drops.

Vacuum

Note that for use in vacuum, water elements, even if only little, should be degassed.

Electrical properties

iglide® H plastic bushings are electrically conductive.