iglidur® G1 - Material data

The most important specifications at a glance

The requirement profile is demanding: Comprehensive advanced development of the successful all-round classic iglidur G. This has been achieved especially in terms of moisture absorption, thermal properties and consistently improved wear resistance. Only with shock, impact and edge loads, the robustness of iglidur G could not quite be achieved.

Descriptive technical specifications
Wear resistance at +23°C	- 🟧 🟧 🟧 🟧 ⬜️ +	More information on wear resistance
Wear resistance at +90°C	- 🟧 🟧 🟧 🟧 ⬜️ +
Wear resistance at +150°C	- 🟧 🟧 🟧 ⬜️ ⬜️ +
Surface pressure	- 🟧 🟧 🟧 ⬜️ ⬜️ +	91MPa
Coefficient of friction	- 🟧 🟧 ⬜️ ⬜️ ⬜️ +	Coefficients of friction µ, dry: 0.11
Wear resistance under water	- 🟧 ⬜️ ⬜️ ⬜️ ⬜️ +
Media resistance	- 🟧 🟧 🟧 ⬜️ ⬜️ +	More information on media resistance
Resistant to edge pressures	- 🟧 🟧 🟧 ⬜️ ⬜️ +
Resistant to shock and impact loads	- 🟧 🟧 🟧 ⬜️ ⬜️ +
Dirt resistance	- 🟧 🟧 🟧 🟧 ⬜️ +
Mould resistance	- 🟧 🟧 🟧 🟧 🟧 +	According to DIN EN ISO 846

When to use it?

When I need a universal all-round bearing
When low moisture absorption is required
For low to medium speeds
For pivoting and rotating applications

When not to use it?

When high impact, shock & edge loads occur -> iglidur G
When lowest wear is required -> iglidur W300
When highest universal media resistance is required -> iglidur X
For underwater applications -> iglidur H370

Temperature

The ambient temperatures strongly influence the properties of plain bearings. The temperatures prevailing in the bearing system also have an influence on its wear. With increasing temperatures, the wear increases and this effect is significant when temperatures rise over +120°C. For temperatures over 120°C, an additional securing of the bearings in the housing is required.

min. application temperature	Upper application temperature, long-term	Upper application temperature, short-term	In addition secure axially from
-40°C	+180°C	+220°C	+120°C

Permissible surface speeds

iglidur G1 was developed for low to medium surface speeds. The maximum values specified under "Maximum surface speed" can only be achieved at low pressures. At the specified speeds, friction can a temperature increase to maximum permissible levels. In practice, these limit values cannot always be achieved due to the interaction of various influences.

Surface speed of various iglidur materials

Information on the p x v value and lubrication

Maximum surface speed

m/s	Rotating	Oscillating	linear
permanent	1.3	1.0	5.0
Short-term	2.5	1.8	6.0

Permissible p x v values

Diagram 01: Permitted pv values for iglidur® G1

p x v value, max. (dry)

MPa · m/s

0.60

Mechanical specification

The compressive strength of iglidur G1 plain bearings decreases with increasing temperatures. Diagram 02 illustrates this relationship. At the long-term permissible application temperature of +180°C, the permissible surface pressure is approximately 40MPa. The maximum recommended surface pressure represents a mechanical material parameter. No conclusions about the tribological properties can be drawn from this. Diagram 03 shows the elastic deformation of iglidur G1 under radial loads. Plastic deformation can be negligible up to a pressure of approx. 100MPa. However, it also depends on the duration of the effect.

Friction and wear

The coefficient of friction μ of a plain bearing is influenced by surface speed and load, among other factors (diagram 04 and 05).

Coefficients of friction for iglidur G1 against steel (Ra = 1µm, 50HRC):

iglidur® G1	Dry	Greases	Oil	Water
Coefficient of friction µ	0.13 - 0.32	0.09	0.04	0.04

Shaft materials

The friction and wear are also dependent, to a large degree, on the mating partner. Shafts that are too smooth increase both the coefficient of friction and the wear of the bearing. For iglidur G1 a ground surface with an average surface finish Ra = 0.8µm is recommended. Diagram 06 shows an extract of results of tests with different shaft materials with plain bearings made from iglidur G1. It can be observed that iglidur G1 achieves good to very good wear results with all shaft materials. The results for stainless steel types are most likely slightly lower. As with many of the iglidur materials, the wear rate is better in pivoting than rotating applications.

Wellenwerkstoffe

Installation tolerances

iglidur G1 plain bearings are standard bearings for shafts with h-tolerance (recommended minimum h9). The bearings are designed for press fitting into a housing machined to a h7 tolerance. After installation into a nominal size housing, in standard cases the inner diameter automatically adjusts to the F10 tolerances. For certain dimensions, the tolerance deviates from this depending on the wall thickness (see product range).

Important tolerances according to ISO 3547-1 after the press-fit:

Diameter d1 [mm]	Housing H7 [mm]	plain bearing F10 [mm]	Shaft h9 [mm]
up to 3	+0.000 +0.010	+0.006 +0.046	-0.025 +0.000
> 3 up to 6	+0.000 +0.012	+0.010 +0.058	-0.030 +0.000
> 6 up to 10	+0.000 +0.015	+0.013 +0.071	-0.036 +0.000
> 10 up to 18	+0.000 +0.018	+0.016 +0.086	-0.043 +0.000
> 18 up to 30	+0.000 +0.021	+0.020 +0.104	-0.052 +0.000
> 30 up to 50	+0.000 +0.025	+0.025 +0.125	-0.062 +0.000
>50 to 80	+0.000 +0.030	+0.030 +0.150	-0.074 +0.000
>80 to 120	+0.000 +0.035	+0.036 +0.176	-0.087 +0.000
> 120 up to 180	+0.000 +0.040	+0.043 +0.203	+0.000 +0.100

Chemical resistance

All data at room temperature [+20 °C], + resistant 0 conditionally resistant - non-resistant

Medium	Resistance
Alcohols	+ up to 0
Hydrocarbons	+
Diluted acids	0 to -
Strong acids	-
Diluted alkalines	+
Strong alkalines	0
Greases, oils without additives	+
Fuels	+

Moisture absorption

The moisture absorption of iglidur G1 plain bearings in ambient conditions is around 0.2% by weight. The saturation limit in water is 1.7% by weight. This must be taken into account under appropriate operating conditions.