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igus® inc.

PO BOX 14349

East Providence

RI 02914

+1 800 521 2747
+1 401 438 7270
igus® inc.

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East Providence, RI

+1 401 438 2200
+1 401 438 7270

iglide® Z - Material data

Materials table

General features Unit iglide® Z Test method
Density g/cm³ 1.40
Color Brown
Max. humidity absorption at 73° F/50% R. H. Wt.-% 0.3 DIN 53495
Max. water absorption Wt.-% 1.1
Coefficient of surface friction, dynamic, against steel µ 0.06 - 0.14
p x v value, max. (dry) psi x fpm 24,000

Mechanical properties
Modulus of elasticity psi 348,100 DIN 53457
Tensile strength at 68° F psi 13,775 DIN 53452
Compressive strength psi 9,425
Permissible static surface pressure (68° F) psi 21,750
Shore D hardness 81 DIN 53505

Physical and thermal properties
Max. long-term application temperature °F 482
Max. short-term application temperature °F 590
Min. application temperature °F -148
Thermal conductivity [W/m x K] 0.62 ASTM C 177
Coefficient of thermal expansion (at 73° F) [K-1 x 10-5 ] 4 DIN 53752

Electrical properties
Specific volume resistance Ωcm > 1011 DIN IEC 93
Surface resistance Ω > 1011 DIN 53482

Permissible p x v values  
Permitted p x v values

For iglide® Z plastic bushings with 0.039 inches 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 temperatures

 
Compressive Strength

iglide® Z is a high-temperature material for bushings suitable for applications with extremely high specific loads. With radial loads between 7,250 psi and 14,500 psi, there is no other iglide® material with better wear resistance in dry operation. The graph shows the elastic deformation of iglide® Z with radial loads. Under the maximum recommended surface pressure of 21750 psi, the deformation amounts to about 5.5%.

Maximum surface speed

fpm Rotating Oscillating Linear
Constant 295 216 984
Short-term 689 492 1181

Permitted surface speeds

iglide® Z is suitable for both medium and - due to the high heat resistance - high speeds. The maximum values stated in the table can be attained 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.

Maximum recommended surface pressure dependent on the temperature

Maximum recommended surface pressure dependent on the temperature

 
Wear with different shaft materials, oscillating and rotating movement

Wear dependent on the temperature, rotating application with p = 108 psi and V = 98 fpm (1050 hard chromed)

 
Temperatures

The short-term permitted maximum temperature amounts to 590° F and thus attains the maximum heat resistance of any iglide® material.

With increasing temperatures, the compressive strength of iglide® Z plastic bushings decreases. The graph clarifies this connection.

The temperatures prevailing in the bushing system also have an influence on the bushing wear. The wear rises with increasing temperatures.

The graph shows that in the iglide® Z plastic bushing the wear just doubles if the temperature rises to 302° F. Under high temperatures, iglide® Z is also the most wear-resistant material in dry operation.

Temperature limits

iglide® Z Application temperature
Lower - 148 °F
Upper, long-term + 482 °F
Upper, short-term + 590 °F
Additional axial securing + 293 °F

Coefficients of friction dependent on the surface speed

Coefficients of friction dependent on the surface speed, p = 108 psi

 
Friction and wear

The coefficient of friction alters only slightly like the wear resistance with increasing load.

Friction and wear also depend to a high degree on the reverse partner. Very smooth shafts increase the coefficient of both friction and wear. iglide® Z proves to be relatively insensitive with regard to the shaft surface. The best suited is a smoothed surface with an average roughness range of 16 - 32 rms.

Coefficients of friction for iglide® Z against steel
(Ra = 1 µm, 50 HRC)

iglide® Z Dry Fat Oil Water
Coefficients of friction µ 0.06 - 0.14 0.09 0.04 0.04

Coefficients of friction dependent on the load

Coefficients of friction dependent on the load, v = 1.97 fpm

 
Coefficients of friction dependent on the shaft surface

Coefficients of friction dependent on the shaft surface (1050 hard chromed)

 
Wear, rotating application with different shaft materials

Wear, rotating application with different shaft materials, load p = 108 psi, v = 98 fpm

 
Wear with different shaft materials, oscillating and rotating movement

Wear with various shaft materials in the rotating application dependent on the load

 
Shaft materials

The diagrams show, in the lower load range, wear rates that are by all means similar to that of other indicated iglide® materials. In the upper range in contrast, iglide® Z outclasses all other materials in wear resistance.Provided a 1050 hard chromed shaft is used, the wear at 6525 psi is still only 15 µm/km.

With low loads, the iglide® Z plastic bushings wear out less in pivoting applications than in rotating applications. 303 Stainless Steel and hard-chromed shafts stand out in particular here. The value 0.5 µm/km shows 303 Stainless provides the lowest wear in oscillating movements at 280 psi. With higher loads hard-chromed shafts outperform 303 Stainless. However even at 14,500 psi, iglide® Z attains excellent coefficients of wear.

Please contact us in case the shaft material scheduled by you is not included in this diagram.

Wear for oscillating and rotating applications

Wear for oscillating and rotating applications with 1050 hard chromed

 
Wear in pivoting and rotating applications at constant load with various shaft materials

Wear in pivoting and rotating applications at constant load with various shaft materials, p = 290 psi

 
Important tolerances for iglide® Z plastic bushings according to ISO 3547-1 after the press-fit.

Diameter
d1 [mm]
Shaft h9
[mm]
iglide® Z
F10 [mm]
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

Installation tolerances

iglide® Z plastic bushings are standard bushings for shafts with h-tolerance (recommended minimum h9).

After the installation in a housing bore with H7 tolerance, the inner diameter of the bushing automatically adjusts to F10 tolerance.

Medium Resistance
Alcohol 0
Hydrocarbons, chlorinated +
Greases, oils, without additives +
Fuels +
Weak acids +
Strong acids -
Weak alkaline +
Strong alkaline -
+ resistant      0 conditionally resistant      - non-resistant

Influence of moisture absorption

Influence of moisture absorption of iglide® Z plastic bushings

 

Electrical properties

Specific volume resistance > 1011 Ωcm
Surface resistance > 1011 Ω

Chemical resistance

iglide® Z plastic bushings have a good resistance against chemicals. They possess an excellent resistance to organic solvents, fuels, oils and greases. The material is only partially resistant to weak acids. The moisture absorption of iglide® Z plastic bushings amounts to about 0.3% in standard climatic conditions. The saturation limit in water is 1.1%.

Radioactive rays

iglide® Z plastic bushings are radiation resistant up to a radioactive intensity of 1 x 105 Gy.

UV-resistant

With UV radiation, the tribological properties (wear) of the iglide® Z plastic bushings drop by about 50%.

Vacuum

In application in vacuum, the potentially existent moisture content is degassed. For this reason only the dry iglide® Z plastic bushings are suitable for vacuum.

Electrical properties

iglide® Z plastic bushings are electrically insulating.