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igus® inc.

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igus® inc.

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East Providence, RI

+1 401 438 2200
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iglide® T500 - Material data

Materials table

General features Unit iglide® T500 Test method
Density g/cm³ 1.44
Color Black
Max. humidity absorption at 73° F/50% R. H. Wt.-% 0.1 DIN 53495
Max. water absorption Wt.-% 0.5
Coefficient of surface friction, dynamic, against steel µ 0.09 - 0.27
p x v value, max. (dry) psi x fpm 37,700

Mechanical properties
Modulus of elasticity psi 1,174,800 DIN 53457
Tensile strength at 68° F psi 24,660 DIN 53452
Compressive strength psi 14,500
Permissible static surface pressure (68° F) psi 21,760
Shore D hardness 85 DIN 53505

Physical and thermal properties
Max. long-term application temperature °F 482
Max. short-term application temperature °F 599
Min. application temperature °F -148
Thermal conductivity [W/m x K] 0.6 ASTM C 177
Coefficient of thermal expansion (at 73° F) [K-1 x 10-5 ] 5 DIN 53752

Electrical properties
Specific volume resistance Ωcm < 10 5 DIN IEC 93
Surface resistance Ω < 10 3 DIN 53482

bearings in dry operation  
Permitted p x v values

For iglide® T500 bushings with 0.03937 wall thickness in dry operation against a steel shaft, at 68° F, installed in a steel housing.

iglide® T500 is primarily characterized by the combination of high temperature resistance with compressive strength and high chemical resistance.

Deformation under load and temperatures

Deformation under load and temperatures

 
Compressive Strength

The graph shows how the iglide® T500 plastic bushing elastically deform under loads when they stand.

On the previous page, the graph shows the maximum p x v values at room temperature. In this case, the compressive strength of iglide® T500 approximates that of steel.

The graph below shows the extreme compressive strength of iglide® T500 even at very high temperatures. Even at the maximum long-term application temperature of 482° F, the iglide® T500 plastic bushing still tolerate a surface pressure of about 4350 psi.

Maximum surface speed

fpm Rotating Oscillating Linear
Constant 295 216 984
Short-term 689 492 1968

Permitted surface speeds

iglide® T500 is designed for higher speeds than other iglide® bushings due to its high temperature resistance and good heat conductivity. This is already clear from the p x v values of maximum 37600 psi x fpm.

At the speeds mentioned in the table, only the minimum radial loads are allowed to act on the bushings. The specified values show the speed at which due to friction an increase in temperature up to the long-term permitted value can occur.

bushing surface pressure

Maximum recommended surface pressure dependent on the temperature

 
Temperatures

The iglide® T500 takes the top position also with regard to temperature resistance. With a permitted long-term application temperature of 482° F, the iglide® T500 tolerates even 600° F on a short term.

Like in all thermoplastics, the compressive strength decreases in iglide® T500 as well with rising temperature. Remarkably, however, the wear also significantly drops at the same time within the observed temperature range of 73.4° F to 302° F.

In the most unfavorable cases, a relaxation of the bushings can already occur at temperatures of more than 338° F. This leads to the loosening of the bushing in the housing after the re-cooling. For this reason, the firm seating of the bushing in the housing should be checked in tests at temperatures above 338° F. Steps should be taken if necessary to mechanically secure the bushing. Please contact us if there is any query about the application of the bushing.

Temperature limits

iglide® T500 Application temperature
Lower - 148 °F
Upper, long-term + 482 °F
Upper, short-term + 599 °F
Additional axial securing + 275 °F

bushing surface speed

Coefficients of friction dependent on the surface speed, p = 108 psi (1050 hard chromed)

 
Friction and wear

Like the wear resistance, the coefficient of friction alters with increasing load. The coefficient of friction increases with rising speed, whereas an increasing load acts inversely. The coefficient of friction drops. This illustrates the excellent suitability of iglide® T500 bushings with high loads.

Friction and wear also depend to a high degree on the reverse partner. Extremely smooth shafts enhance the coefficient of friction of the bushing. Ideal are smoothed surfaces with an average surface finish of Ra of 24 to 32 rms.

Coefficients of friction for iglide® T500 against steel
(Shaft finish = 40 rms, 50 HRC)

iglide® T500 Dry Grease Oil Water
Coefficients of friction µ 0.09 - 0.27 0.09 0.04 0.04

bushing loads

Coefficients of friction dependent on the load, v = 1.97 fpm

 
bearing shaft surface

Coefficients of friction dependent on the shaft surface (1050 hard chromed)

 
bushing shaft materials

Wear, rotating application with different shaft materials, load p = 108 psi, v = 98 fpm

 
Shaft materials

The graphs show results of testing different shaft materials with plastic bushings made of iglide® T500. For low loads in the rotating application, the coefficients of wear are ideal with 303 Stainless and HR Carbon Steel shafts. The bushing wear however rises with these two shaft materials above a load of 290 psi , and so hard-chromed or Cold Rolled Steel shafts are better for a higher load range. Similar coefficients of wear exist for cold rolled steel and 303 stainless steel shafts in the pivoting application with low loads. The wear is somewhat higher than in rotating application.

Please contact us in case the shaft material scheduled by you is not included in this list.

bushing with rotation operation

Wear with various shaft materials in the rotating operation dependent on the load

 
beushing wear pivoting application

Wear in pivoting and rotating applications (p = 290 psi) with various shaft materials

 
Important tolerances for iglide® T500 plastic bushings according to ISO 3547-1 after the press-fit.

Diameter
d1 [inches]
Shaft h9
[inches]
iglide® T500
F10 [inches]
Up to 0.019685 0 - 0.0009842 +0.0002362 + 0.0018110
> 0.1181 to 0.2362 0 - 0.0011811 +0.0003937 + 0.0022835
> 0.2362 to 0.3937 0 - 0.0014173 +0.0005118 + 0.0027953
> 0.3937 to 0.7087 0 - 0.0014173 +0.0006299 + 0.0033858
> 0.7087 to 1.1811 0 - 0.0020472 +0.0007874 + 0.0040945
> 1.1811 to 1.9685 0 - 0.0024409 +0.0009842 + 0.0049213
> 1.9685 to 3.1496 0 - 0.0029134 +0.0011811 + 0.0059055

Installation tolerances

iglide® T500 plastic bushings are standard bushings for shafts with h-tolerance (recommended minimum h9).

After the installation in a housing bore with H7 tolerance, the inner diameter of the bushing automatically adjusts to F10 tolerance.

Medium Resistance
Alcohol +
Hydrocarbons,chlorinated +
Greases, oils, without additives +
Fuels +
Weak acids +
Strong acids +
Weak alkaline +
Strong alkaline +
+ resistant      0 conditionally resistant      - non-resistant

Influence of moisture absorption

Influence of moisture absorption of iglide® T500 plastic bushings

 

Electrical properties

Specific forward resistance < 105 Ωcm
Surface resistance < 103 Ω

Chemical resistance

iglide® T500 plastic bushings have almost universal chemical resistance.

They are affected only by concentrated nitric acid and sulfuric acid with an acid content of above 65%. The chemicals list given at the end of this catalog gives detailed information over this.

The moisture absorption of iglide® T500 plastic bushings is extremely low. In standard climatic conditions, it lies below 0.1 Wt-%. Thus the iglide® T500 plastic bushings can be even mounted for underwater applications without any adaptation to the installation conditions. The maximum water absorption is 0.5 Wt-%.

Radioactive rays

iglide® T500 bushings are radiation resistant up to a radioactive intensity of 1 x 105 Gy. iglide® T500 is the radiation-resistant material in the iglide® product range. iglide® T500 is extremely resistant to strong gamma rays and withstands a radiation dose of 1,000 Mrad without any perceptible loss of any of its properties. The material also overcomes an alpha or beta radiation of 10,000 Mrad virtually unscathed.

UV-resistant

The excellent material features of the iglide® T500 do not alter under UV radiation and other climatic influences.

Vacuum

The iglide® T500 plastic bushings can also be used almost unrestrictedly in vacuum. An evaporation takes place only to a minor degree.

Electrical properties

Plastic bushings made of iglide® T500 are electrically conductive.