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igus® inc.

PO BOX 14349

East Providence

RI 02914

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

Vice President

East Providence, RI

+1 401 438 2200
+1 401 438 7270

iglide® P - Material data

Materials table

General features Unit iglide® P Test method
Density g/cm³ 1.58
Color Black
Max. humidity absorption at 73° F/50% R. H. Wt.-% 0.2 DIN 53495
Max. water absorption Wt.-% 0.4
Coefficient of surface friction, dynamic, against steel µ 0.06 - 0.21
p x v value, max. (dry) psi x fpm 11,000

Mechanical properties
Modulus of elasticity psi 768,700 DIN 53457
Tensile strength at 68° F psi 17,400 DIN 53452
Compressive strength psi 9,572
Permissible static surface pressure (68° F) psi 7,252
Shore D hardness 75 DIN 53505

Physical and thermal properties
Max. long-term application temperature °F 266
Max. short-term application temperature °F 392
Min. application temperature °F -40
Thermal conductivity [W/m x K] 0.25 ASTM C 177
Coefficient of thermal expansion [K-1 x 10-5 ] 4 DIN 53752

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

Permissible p x v values  
Permitted p x v values

For iglide® P plastic bushings with 0.039 inches wall thickness in dry operation against a steel shaft, at 68° F, installed in a steel housing.

The iglide® P plastic bushings are a cost-effective, maintenance-free bushing solution for the user. Compared to iglide® G300, bushing made of iglide® P are better suited for rotating motions and high loads.

Deformation under load and temperatures

Deformation under load and temperatures

 
Compressive Strength

The graph shows the elastic deformation of iglide® P with radial loads. At the maximum permissible load of 5075 psi, the deformation is less than 3% at room temperature.

Maximum surface speed

fpm Rotating Oscillating Linear
Constant 196 137 590
Short-term 393 275 787

Permitted surface speeds

The iglide® P plastic bushings are maintenance-free bushings developed for low to medium surface speeds. The maximum values stated in the table can be attained only with very low surface pressure. The specified maximum speed is the speed at which the long-term permitted temperature is reached by an increase in heat through friction.

Maximum recommended surface pressure dependent on the temperature

Maximum recommended surface pressure dependent on the temperature

 
Temperatures

Even with its maximum long-term application temperature of 266° F, iglide® P does not approach the values of iglide® G300. With a short-term permitted maximum temperature of 392° F, a paint drying process is still possible without further load.

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

The temperatures prevailing in the bushing system also have an influence on the bushing wear. Rising temperatures mean higher wear.

Temperature limits

iglide® P Application temperature
Lower - 40 °F
Upper, long-term + 266 °F
Upper, short-term + 392 °F
Additional axial securing + 194 °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 like the wear resistance with increasing load. For iglide® P the coefficient of friction slightly increases with increasing speed. The graph shows how strongly the coefficient of friction drops with increasing load. From about 870 psi, the coefficient of friction is already below 0.1.

For iglide® P plastic bushing a ground surface with an averageroughness range of 4 - 8 rms is recommended for the shaft. Both smoother and rougher shafts finishes clearly increase the friction.

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

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

plastic bushings coefficient of friction

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 (Shaft 1050 case hardened and ground steel)

 
Wear with different shaft materials, oscillating and rotating movement

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 operation dependent on the load

 
Shaft materials

The graphs show a summary of the results of tests with different shaft materials conducted with plastic bushings made of iglide® P.

In rotating applications, the wear of iglide® P is very low with Cold Rolled Steel and HR Carbon Steel shafts. On the other hand, the bushings on 303 Stainless Steel shafts as well as hard-chromed shafts result in higher wear than other shaft materials even in the lowload range. For example, at a load of 290 psi Cold Rolled Steel is six times better than 303 Stainless Steel.

The wear rates of low-stressed bushings in pivoting motions with most shaft materials are lower than in rotating applications. For this purpose, the Cold Rolled Steel and hard-chromed shafts prove to be the best sliding partners. Also, the 303 Stainless Steel shafts that have poor results for rotation, are excellent for the oscillating application.

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

Wear with various shaft materials in the rotating operation

Wear with the Cold Rolled Steel shaft in oscillating and rotating applications

 
Wear with different shaft materials, oscillating and rotating movement

Wear in oscillating and rotating applications with various shaft materials, p = 290 psi

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

Diameter
d1 [inch]
Shaft h9
[inch]
iglide® P
E10 [inch]
Up to 0.019685 0 - 0.0009846 +0.000551 + 0.0021260
> 0.1181 to 0.2362 0 - 0.0011811 +0.000787 + 0.0026772
> 0.2362 to 0.3937 0 - 0.0014173 +0.000984 + 0.0032677
> 0.3937 to 0.7087 0 - 0.0016929 +0.001260 + 0.0040157
> 0.7087 to 1.1811 0 - 0.0020472 +0.001574 + 0.0048819
> 1.1811 to 1.9685 0 - 0.0024409 +0.001969 + 0.0059055

Installation tolerances

iglide® P 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 the E10 tolerance.

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

Influence of moisture absorption of iglide® P plastic bushings

 

Electrical properties

Specific volume resistance > 1013 Ωcm
Surface resistance > 1012 Ω

Chemical resistance

iglide® P plastic bushings have a good resistance against chemicals. They are resistant to most lubricants. The iglide® P is not affected by most weak organic and inorganic acids.

The humidity absorption of iglide® P plastic bushings amounts to about 0.2% in standard climatic conditions. The saturation limit in water is 0.4%. This minor moisture absorption is clearly below the values of iglide® G300.

Radioactive rays

Plastic bushings made of iglide® P are conditionally usable under radioactive radiation. They are resistant up to a radiation intensity of 5 x 10² Gy.

UV-resistant

iglide® P plastic bushings provide a comparably good UV resistance.

Vacuum

The existent humidity of iglide® P plastic bushings degasses in the vacuum. The use in vacuum is possible only limitedly.

Electrical properties

iglide® P plastic bushings are electrically insulating.