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igus® inc.

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igus® inc.

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iglide® Q2 - Material data

Materials table

General features Unit iglide® Q2 test method
Density g/cm³ 1.46
Color beige-brown
Max. moisture absorption at 73°F/50% R. H. Wt.-% 1.1 DIN 53495
Max. moisture absorption Wt.-% 4.6
Coefficient of surface friction, dynamic, against steel µ 0.22 - 0.42
P x v value, max. (dry) psi x fpm 19,500

Mechanical properties
Modulus of elasticity psi 1,214,000 DIN 53457
Tensile strength at 68° F psi 34,810 DIN 53452
Compressive strength psi 18,850
Maximum recommended surface pressure (68° F) psi 17,400
Shore D hardness 80 DIN 53505

Physical and thermal properties
Upper long-term application temperature °F 266
Upper short-term application temperature °F 392
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] 8 DIN 53752

Electrical properties
Specific volume resistance Ωcm > 1013 DIN IEC 93
Surface resistance Ω > 1011 DIN 53482

Plastic Bushings Permitted p x v values

Permissible p x v values for iglide® Q2 plastic bushings running dry against a steel shaft, at 68°F

 
Permitted p x v values

For iglide® Q2 plastic bushings with 0.03 inches (1 mm) wall thickness under dry running conditions against a steel shaft, at 68°F, installed into a steel housing.

Deformation under load and temperatures

Deformation under load and temperatures

 
Compressive Strength

iglide® Q2 plastic bushings stand for high load capacities and good abrasion resistance at high loads. Solid lubricants reduce the coefficient of friction and improve the resistance to wear, which was markedly improved as compared to other iglide® plastic bushings for high load pivoting applications. iglide® Q2 plastic bushings are self lubricating and suitable for any motion.

The graph shows the elasticity deformation of iglide® Q2 plastic bushings during radial loading. Plastic deformation can occur, this depends on the applied pressure.

Maximum surface speed

fpm Rotary Oscillating Linear
Constant 197 137 787
Short-term 393 275 984

Permitted surface speeds

The typical applications for iglide® Q2 plastic bushings are high load pivoting motions at comparatively low speeds. Independently of that, relatively high speeds are still attainable. The speeds shown in the table are threshold values for minimal bushing loads. As loads increase, the admissible speed is reduced with higher loads due to the limitations of the pv value.

Temperatures

iglide® Q2 Application temperature
Lower - 40 °C
Upper, long-term + 266 °F
Upper, short-term + 392 °F
Additional axial securing + 176 °F
Temperature limits for iglide® Q2

maximum permissible static surface pressure

Recommended maximum permissible static surface pressure of iglide® Q2 as a result of the temperature

 
Temperatures

iglide® Q2 is a very temperature resistant material. The short-term temperature exposure limit is at +428 °F. The long-term upper temperature limit of +266 °F permits the broad use in applications typical for the agricultural, utility vehicle or construction equipment fields. However, the pressure resistance of iglide® Q2 plastic bushings declines as temperatures increase. When considering temperatures, the additional frictional heat in the bushing system must be taken into account.

Coefficients of friction as a function of the running speed; p = 108 psi

 
Friction and wear

iglide® Q2 has a low coefficient of friction. Please note that a gliding partner with a rough surface finish will increase the friction. The highest coefficients of friction occur at 40 rms. For iglide® Q2 a ground surface with an average roughness range of 4 - 16 rms is recommended. Furthermore, the coefficient of friction of iglide® Q2 plastic bushings largely depends on the speed and load. As the speed increases, the coefficient of friction will quickly increase as well. However, as the load is reduced, the coefficient of friction initially drops significantly, then moderately.

iglide® Q2 Dry Grease Oil Water
Coefficients of friction µ 0.06 - 0.21 0.09 0.04 0.04

Coefficients of friction for iglide® Q2 against steel
(Shaft finish = 40 rms, 50 HRC)

Coefficients of friction dependent on the load

Coefficients of friction dependent on the load, v = 1.96 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, p = 108 psi, v = 98 fpm

 
Shaft materials

Generally, we recommend the use of hardened shafts for use in high load applications. Furthermore, even at low to medium loads, iglide® Q2 will attain increased service life with "hard" shafts as compared to "soft" shafts.

But for low load applications, the results are outstanding with free cutting steel as well. For high loads, the wear in pivoting applications is much lower than for rotations.

Wear with various shaft materials in the rotating operation

Wear with various shaft materials in the rotating operation

 
Wear with different shaft materials, oscillating and rotating movement

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

 

Medium Resistance
Alcohols +
Hydrocarbons, chlorinated +
Greases, oils, without additives +
Fuels +
Weak acids 0 to -
Strong acids -
Weak alkaline +
Strong alkaline 0
+ resistant      0 conditionally resistant      - non-resistant
glide® Q2 chemical resistance
All specifications at room temperature [+68 °F] iglide® Q2 chemical resistance


Electrical properties

Specific volume resistance > 1013 Ωcm
Surface resistance > 1011 Ω

Effect of moisture absorption

Effect of moisture absorption on iglide® Q2 plastic bushings

 
Chemical Resistance

iglide® Q2 plastic bushings have good resistance to chemicals. They are resistant to most lubricants. The resistance is only limited for acids

Radioactive rays

iglide® Q2 plastic bushings are radiation resistant up to a radioactive intensity of 3 x 102 Gy.

UV-resistant

iglide® Q2 are permanently resistant to UV radiation.

Vacuum

The low water elements degas in the vacuum. Applications under vacuum conditions are possible with restrictions.

Electrical properties

iglide® Q2 plastic bushings are electrically insulating.

Diameter
d1 [mm]
Shaft
h9 [mm]
iglide® Q2
E10 [mm]
Housing H7
[mm]
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
> 80 bis 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® Q2 plastic bushings according to ISO 3547-1 after the press-in

Installation tolerances

iglide® Q2 plastic bushings are standard bushings for shafts with tolerance h (minimum recommendation is 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.