iglide® K - material data

Permitted p x v values for iglide® K plastic bushing running dry against a steel shaft, at 68°F

Permitted p x v values

iglide® K is a wear-resistant universal material. iglide® K is the new general purpose bushing for medium temperatures, low moisture absorption and good environment resistance.

For iglide® K plastic bushings with 0.03 inches (1 mm) wall thickness in dry operation against a steel shaft, at 68°F, installed in a steel housing.

Deformation under load and temperature

Surface Pressure

The graph shows the elastic deformation of iglide® K during radial loading. At the recommended maximum surface pressure of 8,702 psi the deformation is less than 5%. Plastic deformation can occur, this depends on the applied pressure.

Maximum surface speed

fpm	Rotary	Oscillating	Linear
Constant	197	137	591
Short-term	393	275	787

Permitted surface speeds

iglide® K has been developed for low to medium surface speeds. The maximum values shown in the table can be attained only with minor pressure loads. At the specified speeds, an increase in temperature up to the long-term permitted value can occur due to friction. In practice these limit values are not always reached.

Recommended maximum permissible static surface pressure of iglide® K as a result of the temperature

Temperatures

iglide® K plastic bushings can be used between –40°F and +338°F. The short-term permitted maximum temperature is +464°F. The temperatures prevailing in the bushing system also have an influence on the bushing wear. The wear increases with rising temperatures, and the influence is particularly marked from 212°F temperature onward.

iglide® K	Application temperature
Lower	-40°F
Upper, long-term	+338°F
Upper, short-term	+464 °F
Additional axial securing	+158 °F

Temperature limits for iglide® K

Coefficient of friction of iglide® K as a function of the running speed; p = 108 psi

Friction and wear

Just like the wear resistance, the coefficient of friction µ, friction coefficient in short, also alters with the load. Interestingly the coefficient of friction decreases with increasing load, whereas an increasing surface speed causes a rise in the coefficient of friction. The friction and wear are also dependent, to a large degree, on the shaft material. Shafts that re too smooth increase both the coefficient of friction and the wear of the bushing. For iglide® K a ground surface with an average roughness of 6-8 rms is recommended.

iglide® K	Dry	Grease	Oil	Water
Coefficients of friction µ	0.06-0.21	0.09	0.04	0.04

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

Wear of iglide® K , rotating applications with different shaft materials, p = 145 psi, v = 59 fpm

Wear of iglide® K with different shaft materials in rotational applications

Wear with different shaft materials, oscillating and rotating movement p = 290 psi

Shaft Materials

The graphs show the results of testing different shaft materials with plastic bushings made of iglide® K. The graph shows that iglide® K can be combined with a large number of different shaft materials. Only hard-chromed shafts are unsuitable.

It is important to notice that with increasing loads, the recommended hardness of the shaft increases. Soft shafts tend to wear more easily and thus increase the wear of the overall system, if the loads exceed 290 psi.

The comparison of rotational movements to oscillating movements shows that the wear is almost identical at a pressure up to 725 psi. The higher the loads the greater the difference.

Medium	Resistance
Alcohols	+ to 0
Hydrocarbons, chlorinated	+
Greases, oils, without additives	+
Fuels	+
Weak acids	0 to -
Strong acids	-
Weak alkaline	+
Strong alkaline	0

+ resistant      0 partially resistant      - non-resistant
All specifications at room temperature [+68°F]
Chemical resistance of iglide® K

Effect of moisture absorption on iglide® K plastic bushings

Electrical properties

Specific volume resistance	> 1012 Ωcm
Surface resistance	> 1012 Ω

Chemical Resistance

iglide® K plastic bushings are resistant to diluted alkalis and very weak acids as well as to fuels and all kinds of lubricants. The low moisture absorption allows them to be used in wet or damp environment.

Radioactive rays

They are resistant up to a radiation intensity of 5 x 10² Gy.

UV-resistant

iglide® K plastic bushings change color under the influence of UV rays. However the hardness, compressive strength and the wear resistance of the material do not degrade.

Vacuum

When used in vacuum environment, the iglide® K plastic bushings release moisture as vapor. therefore, only dehumidified bushings are suitable in a vacuum environment.

Electrical properties

Electrically insulating

Diameter d1 [mm]	Shaft h9 [mm]	iglide® K E10 [mm]	Housing H7 [mm]
0 to 3	0 - 0,036	+0,014 +0,054	0 +0,010
> 3 bis 6	0 - 0,030	+0,020 +0,068	0 +0,012
> 6 to 10	0 - 0,043	+0,025 +0,083	0 +0,015
> 10 to 18	0 - 0,043	+0,032 +0,102	0 +0,018
> 18 to 30	0 - 0,052	+0,040 +0,124	0 +0,021
> 30 to 50	0 - 0,062	+0,050 +0,150	0 +0,025
> 50 to 80	0 - 0,074	+0,060 +0,180	0 +0,030
> 80 to 120	0 - 0,087	+0,072 +0,212	0 +0,035
> 120 bis 180	0 - 0,100	+0,085 +0,245	0 +0,040

Table 07: Important tolerances for iglide® K plastic bushings according to ISO 3547-1 after the press-in

Installation tolerances

iglide® K 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. Compared to the installation tolerance, the inner diameter varies according to moisture absorption.