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igus® inc.

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+1 401 438 7270
igus® inc.

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East Providence, RI

+1 401 438 2200
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iglide® J plastic bushings: Material data

Materials table

General features Unit iglide® J Test method
Density g/cm³ 1.49
Color Yellow
Max. moisture absorption at 73° F/50% R. H. Wt.-% 0.3 DIN 53495
Max. moisture absorption Wt.-% 1.3
Coefficient of surface friction, dynamic, against steel µ 0.06 - 0.18
p x v value, max. (dry) psi x fpm 9700

Mechanical properties
Modulus of elasticity psi 348,100 DIN 53457
Tensile strength at 68° F psi 10,590 DIN 53452
Compressive strength psi 8,702
Permissible static surface pressure (68° F) Psi 5,076
Shore D hardness 74 DIN 53505

Physical and thermal properties
Max. long-term application temperature °F 194
Max. short-term application temperature °F 248
Min. application temperature °F -58
Thermal conductivity [W/m x K] 0.25 ASTM C 177
Coefficient of thermal expansion (at 73 °F)[K-1 x 10-5 ] 10 DIN 53752

Electrical properties
Specific volume resistance Ωcm > 1013 DIN IEC 93
Surface resistance Ω > 1012 DIN 53482

Permissible p x v  
Permissible p x v values

Permissible p x v value for iglide® J plastic bushings running oil free against a steel shaft at 68° F.

iglide® J plastic bushings are characterized by their extremely low coefficient of friction while operating dry and minimal stick-slip effect.

low load bushings

Deformation under load and temperature

 
Compressive Strength

With a maximum recommended surface pressure of 5,075 psi, iglide® J plastic bushings are not suitable for extremely high loads. The graph (left) shows the elastic deformation of iglide® J for radial loads. At the maximum recommended surface pressure of 5,075 psi, the deformation is less than 2.5%.

Maximum surface speeds

fpm Rotating Oscillating Linear
Continuous 295 216 1,574
Short-term 590 413 1,968

Permissible surface speeds

The low coefficient of friction and extremely low stick-slip tendency of iglide® J plastic bushings are particularly important at very low speeds. However, iglide® J can also be used at speeds over 197 fpm. In both cases, the static friction remains low and stick-slip does not occur.

The maximum values stated in the Table 3.2 can be attained only with minimum pressure loads. The stated values show the speed at which the temperature rises according to friction to the highest permitted value.

plastic bushing temparatures

Figure 3.3: Maximum recommended surface pressure dependent on the temperature

 
Temperatures

The iglide® J plastic bushings are usable between -58° F and +194° F; the short-term permitted maximum temperature is 248°F.

The diagram 3.3 shows that the compressive strength of the iglide® J plastic bushings decreases with rising temperatures. From 176° F onward, the wear strongly increases.

The iglide® J plastic bushings are usable between -58° F and +194° F; the short-term permitted maximum temperature is 248°F.

iglide® J Application temperature
Lower

- 58 °F

Upper, long-term + 194 °F
Upper, short-term + 248 °F
Additional axial securing + 140 °F

plastic bushings strength

Graph to show that the compressive strength of iglide® J plastic bushings decreases with increasing temperatures. From 176°F onward, the wear drastically increases.

 
Friction and Wear

The graph (left) shows the coefficient of friction under different loads. The coefficient of friction for iglide® J is excellent no matter what the load.

Friction and wear are also dependent on the type of shaft used. The rougher the shaft, the higher the coefficient of friction. The ideal would be to use a smoother shaft with an average roughness range of 4 - 12 rms.

Coefficients of friction for iglide® J with a steel shaft
(Shaft finish = 40 rms, 50 HRC)

iglide® J Dry Grease Oil Water
Coefficients of friction µ 0.06 - 0.18 0.09 0.04 0.04

plastic bushing friction graph

Coefficient of friction of iglide® J as a result of the load, v = 1.97 fpm

 
plastic bushings coefficient of friction

Coefficient of friction of iglide® J dependent as a result of the shaft surface (1050 hard chromed)

 
plastic bushing wear

Wear of iglide® J in a rotating application using different shaft materials, p = 108 psi, v = 98 fpm

 
wear graph

Wear of iglide® J in a rotating application testing different shaft materials and loads

 
bushing shaft materials

Wear in oscillating and rotating applications testing different shaft materials under a constant load, p = 290 psi

 
Shaft materials

The graphs (left) show results obtained from testing different shaft materials with bushings made from our proprietary iglide® J plastic bushings.

If iglide® J plastic bushings are used in rotational applications with loads no greater than 290 psi, several shaft materials are suitable. However, a hard chrome plated shaft generates the lowest amount of wear. When compared to other iglide® materials, iglide® J has very low wear results at low loads with all shaft materials tested.

The wear resistance of iglide® J plastic bushings is exceptional even with increasing loads up to 725 psi. The best shaft partner is 303 stainless steel.

iglide® J wears slightly faster when used in combination with Cold Rolled Steel and HR Carbon Steel shafts in oscillating applications that it does when used with these shafts and rotational movement. For oscillating motion with loads of 290 psi, iglide® J performs best with Cold Rolled Steel shafts.

As the graph (left) shows, the difference between rotating and oscillating movements is most significant for 303 Stainless Steel shafts.

If the shaft material you want to use is not included in this list, please contact us. We'll be happy to help.

Important tolerances for iglide® J plastic bushings after pressfit, according to ISO 3547-1 for plastic bushings and wrapped bushes

Diameter
d0.03937 [in]
Shaft h9
[in]
iglide® J
E10 [in]
Up to 0.019 0 - 0.0009 +0.00055 + 0.0021
> 0.11 to 0.23 0 - 0.0011 +0.00078 + 0.0026
> 0.23 to 0.39 0 - 0.0014 +0.00098 + 0.0032
> 0.39 to 0.70 0 - 0.0016 +0.00125 + 0.0040
> 0.70 to 1.18 0 - 0.0020 +0.00157 + 0.0048
> 1.1.8 to 1.97 0 - 0.0024 +0.00196 + 0.0059
> 1.97 to 3.15 0 - 0.0001 +0.00236 + 0.0070

Installation tolerances

iglide® J plastic bushings are oversized before pressfit.

After proper installation into a recommended housing bore, the inner diameter adjusts automatically to meet our specified tolerances.

Medium Resistance
Alcohol +
Hydrocarbons, chlorinated +
Greases, oils without additives +
Fuels +
Weak acids 0 to -
Strong acids -
Weak alkalines +
Strong alkalines + to 0
+ resistant      0 conditionally resistant      - not resistant

moisture absorption of bushings

Effect of moisture absorption on iglide® J plastic bushings

 

Electrical properties

Specific volume resistance > 1013 Ωcm
Surface resistance > 1012 Ω

Chemical resistance

iglide® J plastic bushings are resistant to diluted lyes and very weak acids, as well as to fuels and all types of lubricants. The low moisture absorption also permits their use in wet or damp environments. Plastic bushings made from iglide® J are resistant to common cleaning agents used in the food industry.

The moisture absorption of iglide® J plastic bushings is 0.3% in standard environments. The saturation limit in water is 1.3%. These values are so low that design changes due to moisture absorption need only be considered in extreme cases.

Radiation resistance

iglide® J plastic bushings are resistant to radiation up to an intensity of 3 x 10² Gy.

UV resistance

iglide® J plastic bushings become discolored under influence of UV radiation. However, the hardness, compressive strength, and wear resistance of the material do not change.

Vacuum

When used in a vacuum environment, the iglide® J plastic bushings release moisture as a vapor. Therefore, only dehumidified bushings made from iglide® J are suitable for vacuum environments. the potentially existent moisture content is degassed.

Electrical properties

iglide® J plastic bushings are electrically insulating.