|General features||Unit||iglide® D||Test method|
|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|
|Modulus of elasticity||psi||290,100||DIN 53457|
|Tensile strength at 68° F||psi||10,440||DIN 53452|
|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|
|Specific forward resistance||Ωcm||> 1014||DIN IEC 93|
|Surface resistance||Ω||> 1014||DIN 53482|
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.
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.
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.
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.
|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 µ||0.08 - 0.26||0.09||0.04||0.04|
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.
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.
|Shaft h9 |
|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|
|Alcohol||+ to 0|
|Greases, oils, without additives||+|
|Weak acids||0 to -|
|Strong alkaline||+ to 0|
|Specific forward resistance||> 1014 Ωcm|
|Surface resistance||> 1014 Ω|
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.
iglide® D plastic bushings are radiation resistant up to a radioactive intensity of 3 x 10² Gy.
iglide® D plastic bushings are resistant to UV radiation, but the tribological properties deteriorate with continuous exposure.
In vacuum, iglide® D degases. The use in vacuum is possible only limitedly.
iglide® D plastic bushings are electrically insulating.
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.