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iglidur® T220 is a special material for application in the tobacco processing industry. It fulfills the demands of the tobacco industry (engineering database). The material is free of undesirable or banned ingredients, as requested by reputed manufacturers from 2004 onward.
iglidur® T220 - Material data
Materials table
'Table 01: Material Data
| Genera l features | Unit | iglidur® T220 | test method |
| Density | g/cm³ | 1,28 | |
| Colour | white | ||
| Max. humidity absorption at 23°C/50% R. H. | % weight | 0,3 | DIN 53495 |
| Max. water absorption | % weight | 0,5 | |
| Coefficient of surface friction, dynamic, against steel | μ | 0,20-0,32 | |
| pv value, max. (dry) | MPa x m/s | 0,28 | |
Mechanical properties |
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| Bending E-module | MPa | 1.800 | DIN 53457 |
| Tensile strength at +20 °C | MPa | 65 | DIN 53452 |
| compressive strength | MPa | 55 | |
| Maximum recommended surface pressure (20° C) | MPa | 40 | |
| Shore D-hardness | 76 | DIN 53505 | |
Physical and thermal properties |
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| Max. long term application temperature | °C | +100 | |
| Max. short term application temperature | °C | +160 | |
| Minimum application temperature | °C | -40 | |
| thermal / heat conductivity | W/m x K | 0,24 | ASTM C 177 |
| Coefficient of thermal expansion (at 23° C) | K–1 x 10–5 | 11 | DIN 53753 |
Electrical properties |
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| Specific forward resistance | Ωcm | > 1010 | DIN IEC 93 |
| surface resistance | Ω | > 1010 | DIN 53482 |
| 1) Without additional load; no gliding movement; relaxation not excluded. | |||
Figure 02: Maximum recommended surface pressure dependent on the temperature (40 MPa to +20 °C)
X = Temperature [°C]
Y = Load [MPa]
Figure 03: Deformation under load and temperatures
X = Load [MPa]
Y = Deformation [m/s]
Mechanical properties
Maximum recommended surface pressure represents a mechanical material parameter. Tribological conclusions cannot be drawn from it.
The pressure resistance of iglidur® T220
bearings declines with increasing temperatures. Fig. 02 clarifies this connection.
iglidur® T220 bearings can be stressed up to the permitted limit of 45 MPa. The deformation is then
virtually at 2%. The permitted load is limited by higher temperatures. (Fig. 02).
Maximum surface speed
Table 02: Maximum surface speeds
| m/s | Rotary | oscillating | Linear |
| Constant | 0,4 | 0,3 | 1 |
| Short-term | 1 | 0,7 | 2 |
Permitted surface speeds
The maximum surface speeds of iglidur® T220 bearings amount to 0.4 m/s with continuous rotation. The friction and the entailing heating limit the permitted speeds. From this it follows that higher speeds can be attained in intermittent service or in linear movements.
| iglidur® T220 | Operating temperature |
| Lower | - 40 °C |
| Upper, long-term | + 100 °C |
| Upper, short-term | + 160 °C |
| Secure axially in addition | + 50 °C |
Temperatures
The elasticity of the bearing is dependent on the temperature. Even 60°C leads to a significant increase in elasticity. A mechanical fastening should be considered from +50°C upward.
Figure 04: Coefficients of friction dependent on the surface speed, p = 0,75 MPa
X = Surface speed [m/s]
Y = Coefficient of friction μ
Figure 05: Coefficients of friction dependent on the load, v = 0,01 m/s
X = Load [MPa]
Y = Coefficient of friction μ
Friction and wear
By complying with the requirements established by the tobacco processing industry, the coefficients of friction and wear of the iglidur® T220 bearings are clearly behind those of the best iglidur® bearings. The coefficient of friction decreases with the load while it increases only slightly at higher speeds.
| iglidur® T220 | Dry | Grease | Oil | Water |
| Coefficients of friction µ | 0,2 - 0,32 | 0,09 | 0,04 | 0,04 |
Fig. 06: Wear, rotating application with various shaft materials p = 1 MPa, v = 0.3m/s
X = shaft materials
Y = wear [μm/km]
A = Aluminum, hard-anodized
B = machining steel
C = Cf53
D = Cf53, hard chrome-plated
E = St37
F = V2A
G = X90
Shaft materials
Fig. 06 shows the test results with different
shaft materials conducted with bearings
made of iglidur® T220.
Figure 07 shows that with increase in load, the bearing responds with stronger increase in wear. Therefore care should be taken to maintain the loads under 5 MPa through adequate dimensioning of the bearing.
Fig. 07: Wear with oscillating and rotating applications with Cf53 as a function of the load
X = Load [MPa]
Y = Wear [μm/km]
A = rotating
B = oscillating
| Medium | Resistance |
| Alcohols | + |
| Hydrocarbons | - |
| Fats, oils, without additives | + |
| Fuels | + |
| Diluted acids | 0 |
| Strong acids | - |
| Diluted bases | - |
| Strong bases | - |
All specifications at room temperature [+20°C] Table 05: Chemical resistance of iglidur® T220
Electrical properties
| Specific forward resistance | > 1010 Ωcm |
| Surface resistance | > 1010 Ω |
Chemical resistance
iglidur® T220 bearings are resistant to highly diluted alkalis and very weak acids.
Radioactive rays
iglidur® T220 bearings are radiation resistant up to a radioactive intensity of 3 x 10² Gy.
UV-resistant
iglidur® T220 bearings are not resistant to the influence of UV rays.
Vacuum
The use in vacuum is possible only conditionally. Only dry bearings made of iglidur® T220 should be tested in vacuum.
Electrical properties
Bearings made of iglidur® T220 are electrically insulating.
Delivery program
The iglidur® T220 bearings are manufactured according to order specifications.
| Maximum moisture absorption | |
|---|---|
| by +23 °C/50 % r. F. | 0,3 weight-% |
| Max. water absorption | 0,5 weight-% |
Moisture absorption
The humidity absorption of iglidur® 200 bearings amounts to about 0,3% in standard climatic conditions. The saturation limit in water is 0,5 %. These values are so low that a moisture expansion need to be considered only in extreme cases.
| Diameter
d1 [mm] | Shaft h9
[mm] | iglidur® T220
E10 [mm] | Housing H7
[mm] |
| Up to 3 | 0 - 0,025 | +0,014 +0,054 | 0 +0,010 |
| > 3 to 6 | 0 - 0,030 | +0,020 +0,068 | 0 +0,012 |
| > 6 to 10 | 0 - 0,036 | +0,025 +0,083 | 0 +0,015 |
| > 10 to 18 | 0 - 0,043 | +0,032 +0,102 | 0 +0,018 |
| > 18 to 30 | 0 - 0,052 | +0,040 +0,124 | 0 +0,021 |
| > 30 to 50 | 0 - 0,062 | +0,050 +0,150 | 0 +0,025 |
| > 50 to 80 | 0 - 0,074 | +0,060 +0,180 | 0 +0,030 |
| > 80 to 120 | 0 - 0,087 | +0,072 +0,212 | 0 +0,035 |
| > 120 to 180 | 0 - 0,100 | +0,085 +0,245 | 0 +0,040 |
Table 07: Important tolerances for iglidur® T220 bearings according to ISO 3547-1 after the press-in.
Installation tolerances
iglidur® T220- bearings are standard bearings for shafts with h-tolerance (recommended minimum h9). The bearings are designed for press-fit in a housing with h7 tolerance.
After the installation in a housing bore with H7 tolerance, the inner diameter of the bearing automatically adjusts to the E10 tolerance.
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