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igus® Canada

180 Bass Pro Mills Drive

Concord

Ontario L4K 0G9

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+1 905 760-8688

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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	0.09 - 0.25
p x v value, max. (dry)	psi x fpm	7600
Mechanical properties
Modulus of elasticity	psi	290,000	DIN 53457
Tensile strength at 68° F	psi	10,440	DIN 53452
Compressive strength	psi	10,150
Permissible static surface pressure (68° F)	psi	3,335
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 bearings with 1 mm wall thickness in dry operation against a steel shaft, at 68° F (20° C), installed in a steel housing.

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

Figure 18.2: Deformation under load and temperatures

Compressive Strength

iglide® R bearings were developed mainly for low to medium radial loads. Figure 18.2 shows the elastic deformation of iglide® R with radial loads. Under the maximum permitted load of 3335 psi (23 MPa), 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.

Surface pressure, load

Maximum surface speed

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

Permitted surface speeds

iglide® R bearings are suitable for high surface speeds. Speeds of up to 32.8 ft/s (10 m/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 speed

p x v value, lubrication

Figure 18.3: Maximum recommended surface pressure dependent on the temperature

Temperatures

The short-term permitted maximum temperature is 230° F ( 110° C), and the long-term application temperature is 194° F (90° C). With increasing temperatures, the compressive strength of iglide® R bearings decreases. Fig. 18.3 clarifies this connection.

The temperatures prevailing in the bearing system have an influence on the bearing 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

Temperature

Figure 2.4: Coefficients of friction dependent on the surface speed, p = 109 psi (0.75 Mpa)

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 bearing. 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.

Less distinct is the dependency of the coefficient of friction of the iglide® R bearings on the shaft surface. Many surface finishes as well as other shaft materials can be used without much losses.

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

iglide® R	Dry	Fat	Oil	Water
Coefficients of friction µ	0.09 - 0.25	0.09	0.04	0.04

Coefficients of friction

Wear resistance

Figure 2.5: Coefficients of friction dependent on the load, v = 2 fpm (0.01 m/s)

Figure 18.6: Coefficients of friction dependent on the shaft surface (Cf53 shaft)

Fig. 2.7: Wear, rotating application with different shaft materials, load p = 109 psi (0.75 Mpa), v = 98.5 fpm (0.5 m/s)

Shaft materials

Figures 18.7 to 18.9 display a summary of the results of tests with different shaft materials conducted with bearings made of iglide® R.

At 98.5 fpm (0.5 m/s) and 109 psi (0.75 MPa), the X90 shaft is the best partner. With increasing loads the iglide® R bearings feature the best wear behavior with Cf53 and V2A shafts. In pivoting application, the hard-chromed shaft proves to be the ideal partner.

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

Shaft materials

Figure 18.8: Wear with various shaft materials in the rotating operation dependent on the load

Figure 18.9: Wear in pivoting and rotating applications at constant load with various shaft materials, p = 290 psi (2 MPa )

Important tolerances for iglide® R bearings 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 bearings are standard bearings for shafts with h-tolerance (recommended minimum h9).

After the installation in a housing bore with H7 tolerance, the inner diameter of the bearing automatically adjusts to the E10 tolerance.

Tolerances

Medium	Resistance
Alcohol	+ to 0
Hydrocarbons	+
Fats, oils, without additives	+
Fuels	+
Diluted acids	0 to -
Strong acids	-
Diluted bases	+
Strong bases	+ to 0

+ resistant 0 conditionally resistant - non-resistant

Figure 18.10: Influence of humidity absorption of iglide® R bearings

Electrical properties

Specific forward resistance	> 10¹² Ωcm
Surface resistance	> 10¹² Ω

Chemical resistance

iglide® R bearings can be used under various environmental conditions and in contact with numerous chemicals. Table 18.6 gives an overview of the chemical resistance of iglide® R bearings at room temperature.

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