iglidur® A350 - Material data

Material data table

General properties	Unit	iglidur® A350	Testing method
Density	g/cm³	1.42
Colour		blue
Max. moisture absorption at +23°C/50% room humidity	% weight	0.6	DIN 53495
Max. moisture absorption	% weight	1.9
Coefficient of sliding friction, dynamic against steel	µ	0,10 - 0,20
pv value, max. (dry)	MPa x m/s	0.4
Mechanical properties
Flexural modulus	MPa	2,000	DIN 53457
Flexural strength at 20°C	MPa	110	DIN 53452
Compressive strength	MPa	78
Maximum recommended surface pressure (20°C)	MPa	60
Shore D hardness		76	DIN 53505
Physical and thermal properties
Max. long-term application temperature	°C	+180
Max. short-term application temperature	°C	+210
min. application temperature	°C	-100
Thermal conductivity	[W/m x K]	0.24	ASTM C 177
Coefficient of thermal expansion (at 23°C)	[K^-1 x 10^-5	8	DIN 53752
Electrical properties
Specific transitional resistance	Ωcm	> 10¹¹	DIN IEC 93
Surface resistance	Ω	> 10¹¹	DIN 53482

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diagram. 01: Permissible pv value for iglidur® A350 plain bearings

iglidur® A350 plain bearings are designed in such a way that they can be used for all loads occurring in the food and packaging industry. Even high loads, such as those found in lifting equipment or presses, are no problem and the bearings function reliably without additional lubrication.

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Mechanical specification

The maximum recommended surface pressure is a mechanical material parameter. It cannot be used to draw conclusions about the tribology. The compressive strength of iglidur® A350 plain bearings decreases with increasing temperatures. diagram. 02 illustrates this relationship.

diagram. 03 shows how iglidur® A350 deforms elastically under radial load. Under the maximum surface pressure of 60 MPa, the deformation is less than 5 %.

Diagram 03: Deformation under pressure and temperature

Permissible sliding speeds

iglidur® A350 plain bearings are well suited for low and medium speeds in both rotating and oscillating applications. The wear rates are similar, so there is no preferred type of movement. Linear movements can also be supported well with iglidur® A350. At high sliding speeds, it should be checked whether iglidur® J or iglidur® L250 can be used, as the wear rate of these bearings is lower.

Maximum surface speed

m/s	Rotating	Oscillating	linear
permanent	1	0.8	2.5
Short-term	1.2	0.9	3

Surface Speedp x v value and lubrication

Temperatures

The temperature resistance makes iglidur® A350 the ideal material for plain bearings in the food sector. Additional protection is required at temperatures higher than +140 °C. The wear rate of the iglidur® A350 bearings increases only slightly at higher temperatures. Tests have shown good wear results at temperatures of +100 °C on all tested shaft materials.

iglidur® A350	Application temperature
Minimum	- 100 °C
Max. long-term	+180°C
Maximum, short-term	+ 210 °C
In addition secure axially from	+140°C

Temperatures, coefficient of thermal expansion

Diagram 04: Coefficient of friction as a function of the surface speed, p = 1MPa

Friction and wear

The coefficient of friction of iglidur® A350 against steel is in a medium range (diagrams 04 and 05).

coefficient of friction for iglidur® A350 against steel (Ra = 1 μm, 50 HRC):

iglidur® A300	dry	Greases	Oil	Water
Coefficients of friction µ	0,1 - 0,2	0.09	0.04	0.04

diagram. 05: coefficient of friction as a function of the load,v = 0.01 m/s X = load [MPa] Y = coefficient of friction μ

Further information:

Coefficient of frictionWear resistance

Shaft materials

Corrosion-resistant steels are naturally more suitable for use in the food industry. The tests were therefore carried out on such materials in particular. It has been shown that there is no clear favourite and that 304 SS, high grade steel and hard chrome-plated steel are all suitable. Hard anodised aluminium is also well suited for both linear and rotary movements.

Shaft materials

Chemical resistance

iglidur® A350 plain bearings are resistant to diluted acids and alkalis, alcohols and cleaning agents. They are also resistant to most lubricants. iglidur® A350 bearings are resistant to common cleaning agents used in the food industry. iglidur® A350 is attacked by esters, ketones, chlorinated hydrogens, aromatics and highly polar solvents.

+ resistant 0 conditionally resistant - not resistant
All data at room temperature [+20 °C]

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

Radioactive radiation

Bearings made from iglidur® A350 are resistant to radiation up to a radiation intensity of 2 x102 Gy.

UV resistance

iglidur® A350® bearings are well resistant to UV rays.

Vacuum

In a vacuum, iglidur® A350 bearings outgas. Use in a vacuum is only possible for dry bearings.

Electrical specification

iglidur® A350 plain bearings are electrically insulating.

Electrical properties
Specific transitional resistance	> 10¹¹ Ωcm
Surface resistance	> 10¹¹ Ω

Moisture absorption

The moisture absorption of iglidur® A350 is low and can be neglected when using the standard plain bearings. Even when completely saturated, iglidur® A350 absorbs no more than 1.9 % water.

Maximum moisture absorption
at +23 °C/50 % r. humidity	0.6 % by weight
Max. moisture absorption	1.9% weight

Installation tolerances

iglidur® A350 bearings are standard bearings for shafts with h-tolerance (recommended at least h9). The bearings are designed for press-fitting into an H7-toleranced mount. After installation in a mounting with nominal dimension, the inner diameter of the bearing with F10 tolerance adjusts itself automatically.

Diameter d1 [mm]	Shaft h9 [mm]	iglidur® A350 F10 [mm]	Housing H7 [mm]
up to 3	0 - 0.025	+0.006 +0.046	0 +0.010
> 3 up to 6	0 - 0.030	+0.010 +0.058	0 +0.012
> 6 up to 10	0 - 0.036	+0.013 +0.071	0 +0.015
> 10 up to 18	0 - 0.043	+0.016 +0.086	0 +0.018
> 18 up to 30	0 - 0.052	+0.020 +0.104	0 +0.021
> 30 up to 50	0 - 0.062	+0.025 +0.125	0 +0.025
>50 to 80	0 - 0.074	+0.030 +0.150	0 +0.030