iglidur® Z - material data

The most important specifications at a glance

Alongside iglidur X, iglidur Z is one of the most widely used iglidur high-temperature materials. Its excellent wear behaviour under external conditions (high loads and temperatures) is particularly noteworthy.

Descriptive technical specifications
Wear resistance at +23°C	- 🟧 🟧 🟧 🟧 ⬜️ +	More information on wear resistance
Wear resistance at +90°C	- 🟧 🟧 🟧 🟧 ⬜️ +
Wear resistance at +150°C	- 🟧 🟧 🟧 🟧 ⬜️ +
Sliding properties	- 🟧 🟧 🟧 🟧 🟧 +	Coefficient of friction, dynamic, against steel: µ 0.06 - 0.14
Wear resistance under water	- 🟧 🟧 ⬜️ ⬜️ ⬜️ +
Media resistance	- 🟧 🟧 🟧 🟧 ⬜️ +	More information on media resistance
Resistant to edge pressures	- 🟧 🟧 🟧 🟧 🟧 +
Resistant to shock and impact loads	- 🟧 🟧 🟧 🟧 🟧 +
Dirt resistance	- 🟧 🟧 🟧 🟧 🟧 +

When do I use this material?

At temperatures up to +250°C, continuous, or +310°C, short-term
When low wear is required, especially under high radial load
At high surface speeds
For edge pressure in conjunction with higher surface pressures

When do I use a different material?

For low loads and temperatures -> iglidur P
When an inexpensive all-round plain bearing is required -> iglidur G
When electrically conductive plain bearings are required -> iglidur F, iglidur H, iglidur H370

Download data sheet

Temperatures

The maximum permissible short-term temperature is +310°C. The temperatures prevailing in the bearing system also have an influence on bearing wear. Wear increases with rising temperatures. At high temperatures, iglidur Z is also the most wear-resistant material in dry operation. Additional protection is required at temperatures higher than +145°C.

Temperatures, coefficient of thermal expansion

min. application temperature	Upper application temperature, long-term	Upper application temperature, short-term	In addition secure axially from
-100°C	+250°C	+310°C	+145°C

Permissible surface speed

iglidur Z is a high-temperature material that is suitable for applications with very high specific loads. The maximum values specified in the table can only be achieved at low pressure loads. At the given speeds, friction can cause a temperature increase to maximum permissible levels. In practice, these limit values cannot always be achieved due to the interaction of different influences.

Surface speeds of various iglidur materials

Maximum surface speeds [m/s]	Rotating	Oscillating	linear
Long-term	1.5	1.1	5.0
Short-term	3.5	2.5	6.0

Permissible pv values

pv value, max. (dry)

MPa - m/s

0,84

Information on pv value and lubrication

Mechanical specifications

The maximum recommended surface pressure is a mechanical material parameter. Conclusions about the tribology cannot be drawn from this. The compressive strength of iglidur Z plain bearings decreases with increasing temperatures. Diagram 02 illustrates this relationship. Diagram 03 shows the elastic deformation of iglidur Z under radial load. At 150MPa, the deformation is approx. 5.5%.

Friction and wear

The coefficient of friction decreases with increasing load, as does the wear resistance (diagrams 04 and 05).

Coefficient of friction against steel (Ra = 1μm, 50 HRC):

iglidur Z	dry	Greases	Oil	Water
Coefficient of friction μ	0.06 - 0.14	0.09	0.04	0.04

Shaft materials

Diagram 06 shows wear rates in the lower load range that are quite similar to those of other very wear-resistant iglidur materials. In the upper range, however, iglidur Z outperforms all other materials in terms of wear resistance. With e.g. a Cf53 shaft, the wear at 45MPa is only 15μm/km.
At low loads, iglidur Z plain bearings wear less in pivoting operation than in rotation. 304 stainless steel shafts and hard chrome-plated shafts are particularly noticeable here.

Further information on shaft materials

Chemical resistance

iglidur Z plain bearings have very good resistance to chemicals. They have excellent resistance to organic solvents, fuels, oils and greases. The material is only partially resistant to weak acids.

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

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

Moisture absorption

The moisture absorption of iglidur Z plain bearings is around 0.3% in a normal climate. The saturation limit in water is 1.1%.

Maximum moisture absorption

at +23°C/50% room humidity.

0.3% weight

Maximum total moisture absorption

1.1% weight

Installation tolerances

iglidur Z plain bearings are standard bearings for shafts with h-tolerance (recommended minimum h9). The bearings are designed for press-fit into a housing machined to a H7 tolerance. After installation in a housing with nominal dimensions, the inner diameter of the bearings with E10 tolerance adjusts automatically. For certain dimensions, the tolerance deviates from this depending on the wall thickness (see product range).

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

Diameter d1 [mm]	Housing H7 [mm]	iglidur Z 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