|General features||Unit||iglide® H||Test method|
|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|
|Modulus of elasticity||psi||1,813,000||DIN 53457|
|Tensile strength at 68° F||psi||25,380||DIN 53452|
|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|
|Specific forward resistance||Ωcm||< 10 5||DIN IEC 93|
|Surface resistance||Ω||< 10 2||DIN 53482|
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.
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.
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.
|iglide® H||Application temperature|
|Lower||- 40 °F|
|Upper, long-term||+ 392 °F|
|Upper, short-term||+ 464 °F|
|Additional axial securing||+ 248 °F|
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 µ||0,07 - 0,2||0,09||0,04||0,04|
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.
|Shaft h9 |
|iglide® H |
|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|
|Greases, oils, without additives||+|
|Weak acids||+ to 0|
|Strong acids||+ to -|
|Specific forward resistance||< 105 Ωcm|
|Surface resistance||< 102 Ω|
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.
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.
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.
Note that for use in vacuum, water elements, even if only little, should be degassed.
iglide® H plastic bushings are electrically conductive.