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iglide® J2 - Material data

Material table

General features Unit iglide® J2 test method
Density g/cm³ 1,44
Color light-yellow
Max. humidity absorption at 73°F/50% R. H. % weight 0,2 DIN 53495
Max. water absorption % weight 1,3
Coefficient of surface friction, dynamic, against steel µ 0,11 - 0,27
PV values max. (dry) PSI - ft/min 6,600

Mechanical properties
Bending E-module psi 522,860 DIN 53457
Tensile strength at +68 °F psi 14,648 DIN 53452
compressive strength psi 11,167
Maximum recommended surface pressure (68° F) psi 6,670
Shore D hardness n.b. DIN 53505

Physical and thermal properties
Max. long term application temperature °F +194
Max. short term application temperature °F +230
Lower application temperature °F -58
Heat conductivity [W/m x K] 0,25 ASTM C 177
Coefficient of thermal expansion (at 73° F) [K-1 x 10-5] 7 DIN 53752

Electrical properties
Specific forward resistance Ωcm > 1013 DIN IEC 93
Surface resistance Ω > 1012 DIN 53482
'Table 01: Material Data


Permissible pv values for iglide® J2 bearings
 

Figure 01: Permitted pv-values for iglide® J2 bearings with 1 mm wall thickness in dry operation against a steel shaft, at +68°F, installed in a steel housing.
 
X = Sliding speed [ft/min]
Y = Load [psi]


 
With respect to its general mechanical and thermal specifications, iglide® J2 is directly comparable to our classic, iglide® J. In terms of mechanical properties, such as maximum recommended surface pressure, however, iglide® J2 is superior to iglide® J. Sights should, on the other hand, be lowered with regard to the wear resistance in dry-running operation.


iglide J2 Figure 02: Maximum recommended surface pressure dependent on the temperature (6,672 psi to +68 °F)
 
X = Temperature [°F]
Y = Load [psi]
iglide J2 Figure 03: Deformation under load and temperatures
 
X = Load [psi]
Y = Deformation [%]

Mechanical properties

With increasing temperatures, the compressive strength of iglide® J2 plain bearings decreases. Fig. 02 clarifies this connection. Maximum recommended surface pressure represents a mechanical material parameter. Tribological conclusions cannot be drawn from it.


 

 
Figure 03 shows the elastic deformation of iglide® J2 with radial loads. A potential plastic deformation depends, among other things, on the length of exposure.


Maximum surface speed

ft/min Rotary Oscillating Linear
Constant 157 137 590
Short-term 374 216 984

Table 02: Maximum surface speeds

Permitted surface speeds

iglide® J2 is predominantly suitable for low speeds and dry running conditions; the limit values indicated in Table 02 can only be achieved at very low pressure loads. At the specified speeds, an increase in temperature up to the long-term permitted value can occur due to friction. In practice these limit values are not always reached.


iglide® J2 Application temperature
Lower - 122 °F
Upper, long-term + 194 °F
Upper, short-term + 230 °F
Secure axially in addition + 140 °F

Table 03: Temperature limits for iglide® J2

Temperatures

The temperatures prevailing in the bearing system also have an influence on the bearing wear. The wear increases with rising temperatures, and the influence is especially marked from 194°F temperature onward. An additional securing is recommended at temperatures higher than +140°F.


iglide® J2 Dry Grease Oil Water
Coefficients of friction µ 0,11 - 0,27 0,08 0,07 0,04

Table 04: Coefficients of friction for iglide® J2 against steel (Ra = 1 µm, 50 HRC)

Friction and wear

The coefficient of friction and wear resistance depend on the application parameters (Fig. 04 and 05).

iglide J2 Figure 04: Coefficients of friction dependent on the surface speed, p = 108 psi
 
X = Sliding speed [ft/min]
Y = Coefficient of friction μ
iglide J2 Figure 05: Coefficients of friction dependent on the load, v = 1.96 ft/min
 
X = Load [psi]
Y = Coefficient of friction μ

Wear, rotating application with various shaft materials Fig. 06: Wear, rotating application with various shaft materials p = 145 psi, v = 59 ft/min
 
X = shaft materials
Y = wear [μm/km]
 
A = Aluminum, hard-anodized
B = machining steel

Shaft materials

Friction and wear also depend to a high degree on the reverse partner. Very smooth shafts increase the coefficient of both friction and wear. Figure 06 shows an excerpt of the results of tests with different shaft materials. Fig. 06 shows that when rotating under 145 psi, iglide® J2 has the best wear coefficients with machining steel. During dry-running operations, the wear coefficients on other shafts are sometimes far higher.
Unlike many other iglidea® materials, the wear rate is slightly higher with pivoting movements than with rotational movements with otherwise identical parameters (Fig. 07).

Wear in oscillating and rotating Fig. 07: Wear with oscillating and rotating applications with Cf53 as a function of the load
 
X = Load [psi]
Y = Wear [μm/km]
 
A = Rotating | B = Oscillating

Medium Resistance
Alcohols +
Hydrocarbons +
Greases, oils without additives +
Fuels +
Diluted acids 0 to -
Strong acids -
Diluted bases +
Strong bases + to 0
+ resistant      0 conditionally resistant      - non-resistant
 
All specifications at room temperature[+68 °F]
Table 05: Chemical resistance of the iglide® bearings J2


 

 
Electrical propertiesiglide® J2 bearings are electrically insulating.

Specific forward resistance > 1013 Ωcm
Surface resistance > 1012 Ω

Further properties

Chemical resistance
iglige® J2 bearings are resistant to diluted alkali's and very weak acids as well as to fuels and all kinds of lubricants. The low humidity absorption allows them to be used in wet or humid environment. Plain bearings made from iglide® J2 are resistant to a wide range of cleaning agents used in the food industry.
 

Radioactive rays iglide® J2 bearings are radiation resistant up to a radioactive intensity of 3 • 102 Gy.
 

UV-resistant iglide® J2 bearings change color under the influence of UV rays. However the hardness, compressive strength and the wear resistance of the material do not degrade.
 

VacuumIn application in vacuum, the potentially existent moisture content is degassed. For this reason only the dry iglide® J2 bearings are suitable for vacuum.


Maximum moisture absorption
by 73 °F/50 % r. F. 0,2 Wt.-%
Max. water absorption 1,3 Wt.-%

Table 06: Humidity absorption of iglide® J2
 

Moisture absorption

The humidity absorption of iglide® J2 bearings amounts to about 0.2 % in standard climatic conditions. The saturation limit in water is 1,3 %. These values are so low that a moisture expansion need to be considered only in extreme cases.


Diameter
d1 [mm]
Shaft
h9 [mm]
iglide® J2
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 iglide® J2 bearings according to ISO 3547-1 after the press-in.

Installation tolerances

iglide® J2 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 with nominal diameter, the inner diameter of the bearing automatically adjusts to the E10 tolerance. Compared to the installation tolerance, the inner diameter varies according to moisture absorption.