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iglide® K - material data

Materials table

General features Unitiglide®K Testing method
Density g/cm³ 1.52
Coloryellow-beige
Max. moisture absorption at 73°F/50% R. H. Wt.-% 0.1 DIN 53495
Max. moisture absorption Wt.-% 0.6
Coefficient of surface friction, dynamic, against steel µ0.06 - 0.20
P x v value, max. (dry) psi x fpm 8,600

Mechanical properties

General features Unitiglide®K Testing method
Modulus of elasticity psi507,600DIN 53457
Tensile strength at 68° F psi11,600DIN 53452
Compressive strength psi8,702
Maximum recommended surface pressure (68° F) psi8,702
Shore D hardness 72DIN 53505

Physical and thermal properties

General features Unitiglide®K Testing method
Upper long-term application temperature °F 338
Upper short-term application temperature °F 464
Lower application temperature °F -40
Thermal conductivity W/m x K 0.25ASTM C 177
Coefficient of thermal expansion (at 73° F) K-1 x 10-53DIN 53752

Electrical properties

General features Unitiglide®K Testing method
Specific volume resistance Ωcm > 1012DIN IEC 93
Surface resistance Ω > 1012DIN 53482
plastic buahings Permitted p x v values
plastic buahings Permitted p x v values

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 temperatures

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.

Surface pressure, load

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.


Maximum surface speed

fpmRotaryOscillatingLinear
Constant 197137591
Short-term 393275787
Surface speedp x v value, lubrication
surface pressure on plastic bushings

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
Coefficients of friction dependent on the surface speed

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.

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

iglide® K DryGreaseOil Water
Coefficients of friction µ 0.06-0.21 0.090.040.04
Coefficients of frictionWear resistance
Coefficients of friction dependent on the load

Coefficients of friction of iglide® K as a function of the load, v = 1.96 fpm

Coefficients of friction dependent on the shaft surface

Coefficients of friction of iglide® K as a function of the shaft surface (1050 hard chromed)

Wear, rotating application with different shaft materials

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

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.

Shaft materials
Wear, rotating application with different shaft materials

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

Wear with different shaft materials, oscillating and rotating movement

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

Effect of moisture absorption on iglide® K plastic bushings

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

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

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

Electrical properties

Specific volume resistance Surface resistance
> 1012 Ωcm> 1012 Ω

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.

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 60 - 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
Tolerances

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.

Tolerances