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RI 02914

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iglide® D - Material data

Materials table

General features Unit iglide® D Test method
Density g/cm³ 1.40
Color Green
Max. moisture absorption at 73° F/50% R. H. Wt.-% 0.3 DIN 53495
Max. moisture absorption Wt.-% 1.1
Coefficient of surface friction, dynamic, against steel µ 0.08 - 0.26
p x v value, max. (dry) psi x fpm 8,700

Mechanical properties
Modulus of elasticity psi 290,100 DIN 53457
Tensile strength at 68° F psi 10,440 DIN 53452
Compressive strength psi 10,150
Maximum recommended surface pressure (68° F) psi 3,336
Shore D hardness 78 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
Heat 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 forward resistance Ωcm > 1014 DIN IEC 93
Surface resistance Ω > 1014 DIN 53482


Permitted p x v values

For iglide® D plastic bushings with 1 mm wall thickness in dry operation against a steel shaft, at 68° F, installed in a steel housing.

The development of the iglide® D as a bushing material placed high performances and very low costs high up on the application profile. It should achieve particularly low coefficients of friction in the dry operation at high speeds. Bushings made of iglide® D are selectively supported by a combination of solid lubricants. The material containing silicon achieves extremely low coefficients of friction in dry operation and runs largely free of stick-slip effects.


Deformation under load and temperatures Figure 24.2: Deformation under load and temperatures

Surface pressure

iglide® D plastic bushings were developed mainly for low to medium radial loads. Figure 24.2 shows the elastic deformation of iglide® D with radial loads. Under the maximum recommended surface pressure of 3,336 psi, the deformation amounts to about 3%. A plastic deformation can be negligible up to this value. It is however also dependent on the period of exposure.


Maximum surface speed

fpm Rotating Oscillating Linear
Continuous 295 216 1575
Short-term 591 413 1969

Permitted surface speeds

iglide® D plastic bushings are suitable for high surface speeds. Speeds of up to 1969 fpm are permitted in linear motions! Here too the specified maximum values can be achieved only with minimum pressure loads. The specified values show the speed at which due to friction an increase in temperature up to the long-term permitted value can occur.


Maximum recommended surface pressure dependent on the temperature Figure 24.3: Maximum recommended surface pressure dependent on the temperature

Temperatures

The short-term permitted maximum temperature is 230° F, and the long-term application temperature is 194° F. With increasing temperatures, the compressive strength of iglide® D plastic bushings decreases. Fig. 24.3 clarifies this connection.

The temperatures prevailing in the bushing system have an influence on the bushing wear. The wear rises with increasing temperatures.

Temperature limits

iglide® D Application temperature
Lower - 58 °F
Upper, long-term + 194 °F
Upper, short-term + 230 °F
Additional axial securing + 122 °F


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

iglide® D Dry Grease Oil Water
Coefficients of friction µ 0.08 - 0.26 0.09 0.04 0.04

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

Friction and wear

The coefficient of friction declines like the wear resistance with increasing load. In contrast, a higher surface speed rarely acts on the coefficient of friction of an iglide® D plastic bushings. iglide® D is suitable for applications in which high p x v values are induced mainly through the high surface speed and not as much through the surface pressure.

The dependency of the coefficient of friction of the iglide® D plastic bushings on the shaft coarseness is distinct. In the rms range between 16 - 24, the coefficient of friction attains its optimum value. With values below and above this range, the friction of the bushing system rapidly rises. Other shaft materials can be used without significant losses. Good results were attained in tests even with non-metallic shafts. Ceramic and plastic shafts can also be used.

Coefficients of friction dependent on the load Figure 2.5: Coefficients of friction dependent on the load, v = 1.96 fpm
Coefficients of friction dependent on the shaft surface Figure 24.6: Coefficients of friction dependent on the shaft surface (1050 hard chromed)

Wear, rotating application with different shaft materials Fig. 2.7: Wear, rotating application with different shaft materials, load p = 108 psi, v = 98.5 fpm

Shaft materials

The graphs display a summary of the results of tests with different shaft materials conducted with bushing made of iglide® D.

In the low load range, the hard chromed shaft is the most suitable material for iglide® D plastic bushings. At loads greater than 290 psi, shafts made of 1050 hardened and ground steel as well as 304 stainless steel increase wear resistance.

For oscillating operation, the 1050 hardened and ground steel shafts and the 304 stainless steel shafts can be used in the low load range.

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

Wear with various shaft materials in the rotating operation dependent on the load Figure 24.8: Wear with various shaft materials in the rotating operation dependent on the load
Wear in oscillating and rotating applications at constant load with various shaft materials Figure 24.9: Wear in oscillating and rotating applications at constant load with various shaft materials, p = 290 psi

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

Diameter
d1 [inch]
Shaft h9
[inch]
iglide® D
E11 [inch]
Up to 0.019685 0 - 0.0009842 +0.0005511 + 0.0029133
> 0.1181 to 0.2362 0 - 0.0011811 +0.0007874 + 0.0037007
> 0.2362 to 0.3937 0 - 0.0014173 +0.0009842 + 0.0045275
> 0.3937 to 0.7086 0 - 0.0016929 +0.0012598 + 0.0055905
> 0.7086 to 1.1811 0 - 0.0020472 +0.0015748 + 0.0066929
> 1.1811 to 1.9685 0 - 0.0024409 +0.0019685 + 0.0082677

Installation tolerances

iglide® D plastic bushings 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 bushing automatically adjusts to the E11 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

Influence of moisture absorptio Figure 24.10: Influence of moisture absorption of iglide® D plastic bushings


Electrical properties

Specific forward resistance > 1014 Ωcm
Surface resistance > 1014 Ω

Chemical resistance

iglide® D plastic bushings are resistant to very weak acids, diluted alkalis as well as to fuels and all kinds of lubricants.

The moisture absorption of iglide® D plastic bushings amounts to about 0,2% in standard climatic conditions. The saturation limit in water is 1%. This low moisture absorption also allows the use in wet environment.

Radioactive rays

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

UV-resistant

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

Vacuum

In vacuum, iglide® D degases. The use in vacuum is possible only limitedly.

Electrical properties

iglide® D plastic bushings are electrically insulating.

Delivery program

The iglide® D plastic bushings are manufactured according to order specifications. Please contact us for applications with large numbers of bushings made of iglide® D as alternative to iglide® J.