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igus® inc.

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RI 02914

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iglide® R - Material data

Materials table

General features Unit iglide® R Test method
Density g/cm³ 1.39
Color Dark red
Max. humidity absorption at 73° F/50% R. H. Wt.-% 0.2 DIN 53495
Max. water absorption Wt.-% 1.1
Coefficient of surface friction, dynamic, against steel µ 0.08 - 0.26
p x v value, max. (dry) psi x fpm 8,700

Mechanical properties
Modulus of elasticity psi 282,800 DIN 53457
Tensile strength at 68° F psi 10,150 DIN 53452
Compressive strength psi 9,863
Permissible static surface pressure (68° F) psi 3,336
Shore D hardness 77 DIN 53505

Physical and thermal properties
Max. long-term application temperature °F 194
Max. short-term application temperature °F 230
Min. application temperature °F -58
Thermal conductivity [W/m x K] 0.25 ASTM C 177
Coefficient of thermal expansion (at 68° F) [K-1 x 10-5 ] 11 DIN 53752

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


Permitted p x v values

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

The development of the iglide® R as a bushing material focused on high performance and very low cost. Especially in the dry operation low coefficients of friction and wear were to be attained. Plastic bushings made of iglide® R are selectively supported by a combination of solid lubricants. The iglide® R material achieves extremely low coefficients of friction in dry operation and runs largely free of stick-slip effects.


Deformation under load and temperatures Deformation under load and temperatures

Compressive Strength

iglide® R plastic bushings were developed mainly for low to medium radial loads. The graph shows the elastic deformation of iglide® R with radial loads. Under the maximum permitted load of 3335 psi, the deformation amounts to 3.5%. A plastic deformation can be negligible up to this value. It is however also dependent on the period of exposure.


Maximum surface speed

fpm Rotating Oscillating Linear
Constant 157 118 689
Short-term 236 196 984

Permitted surface speeds

iglide® R plastic bushings are suitable for high surface speeds. Speeds of up to 32.8 ft/s are permitted in linear motions! Here too the specified maximum values can be achieved 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.


surface pressure on plastic bushings Maximum recommended surface pressure dependent on the temperature

Temperatures

The short-term permitted maximum temperature is 230° F, and the long-term application temperature is 194° F. With increasing temperatures, the compressive strength of iglide® R plastic bushings decreases. The graph clarifies this connection.

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

Temperature limits

iglide® R Application temperature
Lower - 58 °F
Upper, long-term + 194 °F
Upper, short-term + 230 °F
Additional axial securing + 122 °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 declines like the wear resistance with increasing load. In contrast, a higher surface speed acts far less on the coefficient of friction of an iglide® R plastic bushing. iglide® R is suitable for applications in which high p x v values are induced mainly through the high surface speed and not as much through the surface pressure.

The coefficient of friction of iglide® R plastic bushings depends greatly on the shaft roughness. In the roughness range between 16 - 24 rms, the coefficient of friction reaches its optimal value. For values above and below this range, the friction of the bushing system increases quickly. Other shaft materials can be used without a large loss. Even with non metallic shafts, good results were obtained in tests. Ceramic and plastic shafts can also be used.

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

iglide® R Dry Grease Oil Water
Coefficients of friction µ 0.06 - 0.25 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 (shaft Cold Rolled Steel)

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

Shaft materials

The graphs show results of testing different shaft materials conducted with plastic bushings made of iglide® R.

In the low load range, the 440B, hard anodized aluminum, 1050 case hardened steel, free cutting and hard chromed shafts are the most suitable shafting partners for iglide® R plastic bushings. At higher loads, the hardened shafts such as 440B and 1050 case hardened steel are recommended

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

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

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

Diameter
d1 [inch]
Shaft h9
[inch]
iglide® R
E10 [inch]
Up to 0.019685 0 - 0.0009843 +0.000551 + 0.0021260
> 0.1181 to 0.2362 0 - 0.0011811 +0.000787 + 0.0026771
> 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 +0.001575 + 0.0048819
> 1.1811 to 1.9685 0 - 0.0024409 +0.001969 + 0.0059055

Installation tolerances

iglide® R 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 + to 0
Hydrocarbons, chlorinated +
Greases, oils, without additives +
Fuels +
Weak acids 0 to -
Strong acids -
Weak alkaline +
Strong alkaline + to 0
+ resistant      0 conditionally resistant      - non-resistant

Influence of moisture absorption Influence of moisture absorption of iglide® R plastic bushings


Electrical properties

Specific volume resistance > 1012 Ωcm
Surface resistance > 1012 Ω

Chemical resistance

iglide® R plastic bushings can be used under various environmental conditions and in contact with numerous chemicals.

The iglide® R plastic bushings are not chemically altered by moisture absorption. However alteration of the features can occur according to water content. The iglide® R plastic bushings absorb up to 0.2% water through atmospheric humidity (73° F, 50% relative atmospheric humidity), and up to 1.1% in saturation in water.

Radioactive rays

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

UV-resistant

iglide® R plastic bushings are resistant to UV radiation, but the tribological properties deteriorate with continuous exposure.

Vacuum

In vacuum, iglide® R degases. The use in vacuum is possible only limitedly.

Electrical properties

iglide® R plastic bushings are electrically insulating.