|General features||Unit||iglide® N54||test method|
|Max. moisture absorption at 73°F/50% R. H.||Wt.-%||1.6||DIN 53495|
|Max. moisture absorption||Wt.-%||3.6|
|Coefficient of surface friction, dynamic, against steel||μ||0.15–0.23|
|P x v value, max. (dry)||psi x fpm||14,000|
|Modulus of elasticity||psi||261,000||DIN 53457|
|Tensile strength at 68° F||psi||10,150||DIN 53452|
|Maximum recommended surface pressure (68° F)||psi||8,700|
|Shore D hardness||74||DIN 53505|
Physical and thermal properties
|Upper long-term application temperature||°F||176|
|Upper short-term application temperature||°F||248|
|Lower application temperature||°F||-40|
|Thermal conductivity||W/m x K||0.24||ASTM C 177|
|Coefficient of thermal expansion (at 73° F)||K-1 x 10-5||9||DIN 53752|
|Specific volume resistance||Ωcm||< 1013||DIN IEC 93|
|Surface resistance||Ω||< 1011||DIN 53482|
For iglide® N54 plastic bushing with 0.03 inches (1 mm) wall thickness under dry running conditions against a steel shaft, at 68°F, installed into a steel housing.
iglide® N54 is the first iglide® material based largely in biopolymers. In addition to the already assured lubricant-free properties of iglide® materials, this is one further contribution to positive environmental stewardship. The good coefficients of friction in conjunction with holding times ensure that these materials have a permanent place in the iglide® product range.
Maximum recommended surface pressure represents a mechanical material parameter. Tribological conclusions cannot be drawn from it. The compressive strength of iglide® N54 plastic bushings decreases with increasing temperatures. The graph clarifies this relationship. At the long-term permitted application temperature of 248°F, the permitted surface pressure still amounts to 210,000.
Even if the typical applications for iglide® N54 plastic bushings are more commonly for intermittent service, depending on the type of motion, the maximum attainable speeds can be quite high. The speeds stated in table are limit values for the lowest bearing loads. As loads increase, the admissible speed is reduced with higher loads due to the limitations of the pv value.
The short-term admissible temperature limit is +248 °F, thus permitting the use of iglide® N54 plastic bushings in all applications with elevated ambient temperatures. However, the compressive strength of iglide® N54 plastic bushings decreases as temperatures increase. The additional frictional heat in the bushing system should be taken into account when considering the temperature limits.
|iglide® N54||Application temperature|
|Lower||- 40 °F|
|Upper, long-term||+ 176 °F|
|Upper, short-term||+ 248 °F|
|Additional axial securing||+ 122 °F|
iglide® N54 has a low coefficient of friction. However it must be noted that a gliding partner with a rough surface finish increases the friction. We recommend shaft surface finishes 4 to 16 rms.
The coefficient of friction of iglide® N54 plastic bushings is only marginally dependent on the surface speed.
The influence of the load is greater; an increase in load lowers the coefficient of friction up to 0.08.
|Coefficients of friction µ||0.15 - 0.35||0.09||0.04||0.04|
|Alcohols||+ to 0|
|Greases, oils, without additives||+|
|Weak acids||0 to +|
|Specific volume resistance||< 1013 Ωcm|
|Surface resistance||< 1011 Ω|
iglie® N54 plastic bushings have good resistance to chemicals. They are resistant to most lubricants. iglide® N54 is not impaired by most weak organic and inorganic acids and bases.
iglide® N54 plastic bushings can be used with restrictions when exposed to radiation. They are resistant up to a radiation intensity of 1 x 104 Gy.
iglide® N54 plastic bushings are resistant to UV rays.
The low water elements degas in the vacuum. Applications under vacuum conditions are possible with restrictions.
iglide® N54 plastic bushings are electrically insulating.
The moisture absorption of iglide® N54 plastic bushings is about 1.6% in standard climatic conditions. The saturation limit in water is 3.6 %.
|Up to 3||0 - 0,025||+0,014 +0,054||0 +0,010|
|> 3 bis 6||0 - 0,030||+0,020 +0,068||0 +0,012|
|> 6 bis 10||0 - 0,036||+0,025 +0,083||0 +0,015|
|> 10 bis 18||0 - 0,043||+0,032 +0,102||0 +0,018|
|> 18 bis 30||0 - 0,052||+0,040 +0,124||0 +0,021|
|> 30 bis 50||0 - 0,062||+0,050 +0,150||0 +0,025|
|> 50 bis 80||0 - 0,074||+0,060 +0,180||0 +0,030|
iglide® UW plastic bushings are standard 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 E10 tolerance.