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igus® inc.

PO BOX 14349

East Providence

RI 02914

+1 800 521 2747
+1 401 438 7270
igus® inc.

Vice President

East Providence, RI

+1 401 438 2200
+1 401 438 7270

iglide® H1 - Material data

Materials table

General features Unit iglide® H1 test method
Density g/cm³ 1,53
Paint cream
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 0,06 - 0,20
P x v value, max. (dry) psi x fpm 22,800

Mechanical properties
Modulus of elasticity psi 406,100 DIN 53457
Tensile strength at 68° F psi 7,977 DIN 53452
Compressive strength psi 11,310
Permissible static surface pressure (68° F) psi 11,600
Shore D hardness 77 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] 0,24 ASTM C 177
Coefficient of thermal expansion [K-1 x 10-5] 6 DIN 53752

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

Plastic Bushings Permitted p x v values  
Permitted p x v values

For iglide® H1 plastic bushings running dry against a steel shaft, at 68°F.

iglide® H1 plastic bushings have been specially developed for use under extreme environmental conditions. Their strengths are the extremely high wear resistance and the excellent coefficients of friction even in applications in which the bushing is exposed to extreme temperatures and/or aggressive chemicals. iglidur® H1 plastic bushings can be used completely free of lubrication; in wet area applications, the surrounding medium acts as additional lubricant.

surface pressure on plastic bushings

Fig. 13.2: Deformation at different loads and temperatures

 
Surface Pressure

Figure 13.2 shows the elastic deformation of iglide® H1 with radial loads. Among the iglide® H materials, iglide® H1 material has the greatest elasticity. This is beneficial in applications with edge loads and is the reason for a higher mechanical loss factor that indicates the vibration dampening capacity of a material.

Maximum surface speed

fpm Rotating Oscillating Linear
Continuous 393 196 984
Short Term 492 295 1378

Permitted surface speeds

Due to the excellent coefficients of friction, rotating surface speeds up to 393 fpm are possible with iglide® H1 plastic bushings in dry operation. Linear speeds up to 984 fpm are attained. The speeds stated in Table 13.2 are limit values for the lowest bushing loads. With higher loads, the permitted speed drops with the extent of the load due to the limitations by the p x v value.

surface pressure on plastic bushings

Fig. 13.3: 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.

iglide® H1 is a temperature-resistant material. The short-term permitted maximum temperature is 464°F, and this enables the iglide® H1 plastic bushings to be used, for instance, in a paint drying process without further load. With increasing temperatures, the compressive strength of iglide® H1 plastic bushings however declines. Figure 13.3 clarifies this connection. In addition to the ambient temperatures, the additional friction heat in the bushing system should be considered. The temperatures prevailing in the bushing system also have an influence on the bushing wear. The wear rises with increasing temperatures.

Temperature limits

iglide® H1 Application Temperature
Lower - 40 °F
Upper, long-term + 392 °F
Upper, short-term + 464 °F
Additional axial securing + 176°F

plastic bushing surface speed

Fig. 13.5: Coefficients of friction dependent on the surface speed, p = 108 psi

 
Friction and wear

The coefficient of friction alters like the wear resistance with increasing load and speed. At constant load the coefficient of friction µ increases with the speed. At constant speed the coefficient of friction lowers with increasing load, whereupon almost constant values result from 5,802 psi. As the counter partner has a large influence on friction and wear, the choice of the appropriate shaft can be decisive. Smoother shafts than Ra = 0.1 µm raises the coefficient of friction. For applications with high loads, we recommend hardened and smoothed surfaces with an average surface finish of 12 - 16 rms.

Coefficients of friction for iglide® H1 against steel
(Shaft finish = 40 rms 50 HRC)

iglide® H1 Dry Grease Oil Water
Coefficients of friction µ 0,06 - 0,2 0,09 0,04 0,04

plastic bushing load

Fig. 13.6: Coefficients of friction dependent on the load, v = 1.97 fpm

 
plasting bushings shaft surface

Fig. 13.7: Friction dependent on the shaft surface (1050 hard chromed)

 
shaft materials for plastic bushings

Figure 13.8: Wear, rotating application with different shaft materials, p = 108 psi, v = 98 fpm

 
Shaft Materials

Figure 13.8 displays a summary of the results of tests with different shaft materials conducted with iglide® H1 plastic bushings in the igus® laboratory. Plastic bushings made of iglide® H1 display a distinctly different behavior with different shaft materials in rotating and pivoting applications. In rotating applications, the 440B and 304 stainless shafts are superior to the aluminum HC and 1050 steel shafts especially with high loads. In pivoting applications, the lowest wear rates were measured in combination with aluminum HC and 304 stainless shafts. With most shafts the rotation wear rates are somewhat lower than the pivoting wear rates.

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

plastic bushings in rotational applications

Figure 13.9: Wear with various shaft materials in the rotating operation dependent on the load

 
plasting bushings with shaft materials

Fig. 13.10: Wear in pivoting and rotating applications with various shaft materials, p = 290 psi

 
Important tolerances for iglide® H1 plastic bushings according to ISO 3547-1 after the press-in

Diameter
d1 [mm]
Shaft h9
[mm]
iglide® H1
F10 [mm]
up to 3 0 - 0,025 +0,006 + 0,046
> 3 bis 6 0 - 0,030 +0,010 + 0,058
> 6 bis 10 0 - 0,036 +0,013 + 0,071
> 10 bis 18 0 - 0,043 +0,016 + 0,086
> 18 bis 30 0 - 0,052 +0,020 + 0,104
> 30 bis 50 0 - 0,062 +0,025 + 0,125
> 50 bis 80 0 - 0,074 +0,030 + 0,150

Installation tolerances

iglide® H1 plastic bushings are press-in bushings for shafts with h-tolerance (recommended minimum h9).

The bushings are designed for press-fit in a housing with h7 tolerance. After the installation in a housing with nominal diameter, the inner diameter of the bushing automatically adjusts to the F10 tolerance.

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


Electrical properties

Specific forward resistance > 1012 Ωcm
Surface resistance < 1011 Ω

Chemical Resistance

iglide® H1 plastic bushings have a good resistance against chemicals. Hence even chemicals can act as lubricants. The iglide® H1 plastic bushings are not resistant against hot, oxidizing acids and some other particularly aggressive chemicals.

The moisture absorption of iglide® H1 plastic bushings is about 0.1% in standard climatic conditions. The saturation limit in water is 0,3%. Therefore iglide® H1 is very well suited for use in wet environments.

UV-resistant

iglide® H1 plastic bushings are only conditionally resistant to UV rays. The surface of iglide® H1 becomes coarser under the influence of atmospheric conditions; the wear increases.

Vacuum

Note: Water elements, even if only little, should be degassed for use in vacuum.

Electrical properties

iglide® H1 plastic bushings are electrically insulating.