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iglide® A180 - Material data

Materials table

General features Unit iglide® A180 Test method
Density g/cm³ 1,46
Color White
Max. moisture absorption at 73° F/50% R. H. % weight 0,2 DIN 53495
Max. moisture absorption % weight 1,3
Coefficient of surface friction, dynamic, against steel µ 0,05 - 0,23
p x v value, max. (dry) psi x fpm 8750

Mechanical properties
Modulus of elasticity psi 333,600 DIN 53457
Tensile strength at 68° F psi 12,760 DIN 53452
Compressive strength psi 11,310
Permissible staticsurface pressure (68° F) psi 4,060
Shore D hardness 76 DIN 53505

Physical and thermal properties
Upper long-term application temperature °F 194
Upper short-term application temperature °F 230
Lower application temperature °F -58
Thermal conductivity [W/m x K] 0,25 ASTM C 177
Coefficient of thermal expansion (at 73° F) [K-1 x 10-5 ] 11 DIN 53752

Electrical properties
Specific fvolume resistance Ωcm > 1012 DIN IEC 93
Surface resistance Ω > 1011 DIN 53482


Permitted p x v values

Plastic bushings made of iglide® A180 are suitable for application in direct contact with foods. Hence they are the ideal solution for plastic bushing positions on machines for the food and packaging industries, the medical equipment manufacturing, for small equipment for households, etc. The iglide® A180 distinguishes itself also in wet cleaning or where process-dependent contact with wet media is the business of the day by its extremely low humidity absorption


plastic bushing elastic deformation Figure 7.2: Deformation under load and temperatures

Surface pressure

The iglide® A180 distinguishes itself also in wet cleaning or where process-dependent contact with wet media is the business of the day by its extremely low humidity absorption. Figure 7.2 shows the elastic deformation of iglide® A180 with radial loads. At the recommended maximum surface pressure of 4060 psi the deformation is less than 2.5%. A plastic deformation is negligible up to this radial load. It is however also dependent on the period of exposure.


Maximum surface speed

m/s Rotating Oscillating Linear
Constant 0,8 0,6 3,5
Short-term 1,2 1 5

Permitted surface speeds

iglide® A180 is developed for low surface speeds. Maximum speeds up to 0.8 m/s (rotating) and 3.5 m/s (linear) respectively are permitted for continuous application in dry operation. These specified values state the limits to which the long-term permitted temperature rises due to frictional heat. In practice these limit values are not always reached due to interactions.


surface pressure on plastic bushings Figure 7.3: Maximum recommended surface pressure dependent on the temperature

Temperatures

The short-term permitted maximum temperature is +230° F. With increasing temperatures, the compressive strength of iglide® A180 plastic bushings decreases. Fig. 7.3 clarifies this connection. The temperatures prevailing in the plastic bushing system also have an influence on the plastic bushing wear.

Temperature limits

iglide® A180 Application temperature
Lower - 58 °F
Upper, long-term +194 °F
Upper, short-term + 230°F
Additional axial securing + 140°F


plastic bushing coefficients of friction Figure 2.4: Coefficients of friction dependent on the surface speed, p = 180 psi

Friction and wear

Similar to wear resistance, the coefficient of friction also changes with the load. For iglide® A180 plastic bushings, the coefficient of friction µ decreases slightly with increasing 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 plastic bushing. For iglide® A180 a ground surface with an average roughness range of 16-24 rms is recommended for the shaft.

Coefficients of friction for iglide® A180 against steel
(Shaft finish = 40 rms, 50 HRC)

iglide® A180 Dry Grease Oil Water
Coefficients of friction µ 0.05 - 0.23 0.09 0.04 0.04

plastic bushing load Figure 2.5: Coefficients of friction dependent on the load, v = 1.96 fpm
surface finish of plastic bushing Figure 7.6: Coefficients of friction dependent on the shaft surface (1050 hard chromed)

rotating plastic bushings Fig. 7.7: Wear, rotating application with different shaft materials, p = 145 psi, v = 59 fpm
shaft materials for plastic bushings Figure 7.8: Wear with different shaft materials, oscillating and rotating movement p = 290 psi
pivoting plastic bushings application Figure 7.9: Wear with different shaft materials in rotational applications

Shaft materials

The diagrams display a summary of the results of tests with different shaft materials conducted with plastic bushings made of iglide® A180.

The combination "iglide® A180/hard-anodized aluminum" clearly stands out. It attains good to excellent wear rates also with other shafts.

With Hard chromed shafts, the higher wear in pivoting applications is exemplary compared to rotating applications.

The graph clearly shows, in the example of the 304 stainless shafts, the direct increase in wear with rising load with "soft" shafts. The increase is hardly noticeable with hard shafts.

Please contact us in case the shaft material scheduled by you is not included in these figures.


Important tolerances for iglide® A180 plastic bushing according to ISO 3547-1 after the press-fit.

Diameter
d1 [mm]
Shaft h9
[mm]
iglide® A180
E10 [mm]
Up to 0.5 0 - 0,025 +0,014 + 0,054
> 3 to 6 0 - 0,030 +0,020 + 0,068
> 6 to 10 0 - 0,036 +0,025 + 0,083
> 10 to 18 0 - 0,043 +0,032 + 0,102
> 18 to 30 0 - 0,052 +0,040 + 0,124
> 30 to 50 0 - 0,062 +0,050 + 0,150

Installation tolerances

iglide® A180 plastic bushing are standard bushings for shafts with h-tolerance (recommended minimum h9).

After the installation in a housing bore with H7 tolerance, the inner diameter of the plastic bushing automatically adjusts to the E10 tolerance.


Medium Resistance
Alcohol +
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

Figure 7.10: Effect of moisture absorption on iglide® A180 plastic bushings


Electrical properties

Specific forward resistance > 1012 Ωcm
Surface resistance > 1011 Ω

Chemical resistance

iglide® A180 plastic bushings can be used under various environmental conditions and in contact with numerous chemicals. The table gives an overview of the chemical resistance of iglide® A180 plastic bushings at room temperature.

The iglide® A180 plastic bushings are not chemically altered by moisture absorption. However alteration of the features can occur according to water content. The iglide® A180 plastic bushings absorb up to 0.2% water through atmospheric humidity.

Radioactive rays

iglide® A180 plastic bushings are radiation resistant up to a radioactive intensity of 3 x 10² Gy. Higher radiations affect the material and can lead to the loss of important mechanical properties.

UV-resistant

iglide® A180 plastic bushings are resistant to UV radiation, but the tribological properties deteriorate with continuous exposure.

Vacuum

The iglide® A180 plastic bushings can be used in vacuum only restrictedly.

Electrical properties

iglide® A180 plastic bushings are electrically insulating.