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igus® inc.

PO BOX 14349

East Providence

RI 02914

+1 800 521 2747

+1 401 438 7270

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iglide® T220 - Material data

Materials table

General features	Unit	iglide® T220	Test method
Density	g/cm³	1.28
Color		White
Max. moisture absorption at 73° F/50% R. H.	Wt.-%	0.3	DIN 53495
Max. water absorption	Wt.-%	0.5
Coefficient of friction, dynamic against steel	µ	0.20 - 0.32
p x v value, max. (dry)	psi x fpm	8,000
Mechanical properties
Modulus of elasticity	psi	261,100	DIN 53457
Tensile strength at 68° F	psi	9,427	DIN 53452
Compressive strength	psi	7,977
Maximum recommended surface pressure (68° F)	psi	5,802
Shore D hardness		76	DIN 53505
Physical and thermal properties
Upper long-term application temperature	°F	212
Upper short-term application temperature	°F	320

Min. application temperature	°F	-40
Thermal conductivity	[W/m x K]	0.24	ASTM C 177
Coefficient of thermal expansion (at 73° F)	[K^-1 x 10^-5]	11	DIN 53752

Electrical properties
Specific volume resistance	Ωcm	> 10¹⁰	DIN IEC 93
Surface resistance	Ω	> 10¹⁰	DIN 53482

Permitted p x v values

For iglide® T220 plastic bushings with 0.039 inches wall thickness in dry operation against a steel shaft, at 68° F, installed in a steel housing.

iglide® 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 and prohibited ingredients, as required by well-known manufacturers of tobacco products.

Deformation under load and temperatures

Compressive Strength

iglide® T220 plastic bushings can be stressed up to the permitted limit of 6,527 psi. However, the level of the load has an influence on the bushing's wear. The permitted load is limited by higher temperatures.

Surface pressure, load

Maximum surface speed

m/s	Rotating	Oscillating	Linear
Constant	78	59	196
Short-term	196	137	393

Permitted surface speeds

The maximum speed of iglide® T220 plastic bushings in continuous rotation is 78 fpm. The frictional heat generated define the permissible speeds. From this it follows that in intermittent service or in linear movements, higher speeds can be attained.

Surface speed

p x v value, lubrication

Maximum recommended surface pressure dependent on the temperature

Temperatures

The bushings made of iglide® T220 can be used continuously up to 212° F. Temperatures up to 320° F are permitted on the short term. The elasticity of the bushing is dependent on the temperature. Even 140° F leads to a clear increase in elasticity. A mechanical fastening should be considered from 140° F upward.

Please contact us if there is any query about the bushing and their application.

Temperature limits

iglide® T220	Application temperature
Lower	- 40 °F
Upper, long-term	+ 212 °C
Upper, short-term	+ 320 °C
Additional axial securing	+ 122 °F

Temperature

Coefficients of friction dependent on the surface speed, p = 108 psi

Friction and wear

As the requirements of the tobacco processing industry was strictly complied with in the development of the material, the application of friction-minimizing additives was limited. Hence the coefficients of friction and wear of the iglide® T220 plastic bushings are clearly behind those of the best iglide® bmaterials.

Coefficients of friction for iglide® T220 against steel
(Shaft finish = 40 rms, 50 HRC)

iglide® T220	Dry	Grease	Oil	Water
Coefficients of friction µ	020 - 0.32	0.09	0.04	0.04

Coefficients of friction

Wear resistance

Coefficients of friction dependent on the load, v = 1.96 fpm

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

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

Shaft materials

The graph show the results of tests for the wear resistance with different shaft materials. By the observance of the recommendations, the service life of a bushing application can be distinctly improved. The graph shows that with increase in load, the bearing responds with stronger increase in wear. Therefore care should be taken to maintain the loads under 725 psi through adequate dimensioning of the bushing.

Shaft materials

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

Wear with pivoting and rotating applications with different shaft materials, dependent on the load; p = 290 psi

Important tolerances for iglide® T220 plastic bushings according to ISO 3547-1 after the press-fit.

Diameter d1 [mm]	Shaft h9 [mm]	iglide® T220 E10 [mm]
Up to 0.5	0 - 0,025	+0,014 + 0,054
> 3 to 6	0 - 0,030	+0,020 + 0,068
> 6 to 10	0 - 0,036	+0,025 + 0,083
> 10 to 18	0 - 0,043	+0,032 + 0,102
> 18 to 30	0 - 0,052	+0,040 + 0,124
> 30 to 50	0 - 0,062	+0,050 + 0,150

Installation tolerances

iglide® T220 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 the E10 tolerance.

Tolerances

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

+ resistant 0 conditionally resistant - non-resistant

Influence of moisture absorption of iglide® T220 plastic bushings

Electrical properties

Specific volume resistance	> 10¹⁰ Ωcm
Surface resistance	> 10¹⁰ Ω

Chemical resistance

iglide® T220 plastic bushings are resistant to highly weak alkalis and very weak acids. The humidity absorption of iglide® T220 plastic bushings amounts to about 0,2% in standard climatic conditions. The saturation limit in water is 0,7%. These values are so low that a moisture expansion need to be considered only in extreme cases.