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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® A500 - Material data

Materials table

"

General features	Unit	iglide® A500	Test method
Density	g/cm³	1.28
Color		Brown
Max. humidity absorption at 73° F/50% R. H.	Wt.-%	0.3	DIN 53495
Max. water absorption	Wt.-%	0.5
Mechanical properties
Bending E-module	psi	522,000	DIN 53457
Bending strength at 68° F	psi	20,300	DIN 53452
Maximum recommended surface pressure (68° F)	psi	17,400
Shore D hardness		83	DIN 53505
Physical and thermal properties
Upper long-term application temperature	°F	482
Upper short-term application temperature	°F	572
Lower application temperature	°F	-148
Electrical properties
Specific forward resistance	Ωcm	> 10¹⁴	DIN IEC 93
Surface resistance	Ω	> 10¹³	DIN 53482

"

Permitted p x v values

For iglide® A500 plastic bushings with 1 mm wall thickness in dry operation against a steel shaft, at 68° F, installed in a steel housing.

Plastic bushings made of iglide® A500 can be used at high temperatures and are permitted for use in direct contact with foodstuffs (FDA compatible). They exhibit an exceptionally good chemical resistance and are suitable for the heavy-duty use in machinery for the food industry.

Figure 10.2: Deformation under load and temperatures

Surface pressure

Though iglide® A500 is an extremely soft material, it simultaneously possesses an excellent compressive strength even at high temperatures. Figure 10.2 shows the maximum recommended surface pressure of the bushing dependent on the temperature. This combination of high stability and high flexibility acts very positively during vibrations and edge loads.

As the wear of the bushing rapidly escalates from pressures of 1,450 to 2,901 psi, we recommend a particularly accurate testing of the application above these limits.

Surface pressure, load

Maximum surface speed

ftpm	Rotating	Oscillating	Linear
Continuous	118	78	196
Short-term	196	137	393

Permitted surface speeds

iglide® A500 also permits high surface speeds due to the high temperature resistance. The coefficient of friction rises however by these high rotatary speeds leading to a higher heating up of the bushings. Tests show that plastic bushings made of iglide® A500 are more wear resistant in pivoting motions, and the permitted p x v values are also higher in the pivoting application.

Surface speed

p x v value, lubrication

Figure 10.3: Maximum recommended surface pressure dependent on the temperature

Temperatures

The short-term permitted maximum application temperature is 572° F. With increasing temperatures, the compressive strength of iglide® A500 plastic bushings decreases. Fig. 10.3 clarifies this connection. The temperatures prevailing in the bushing system also have an influence on the bushing wear.

Temperature limits

iglide® A500	Application temperature
Lower	-148 °F
Upper, long-term	+ 482 °F
Upper, short-term	+ 572 °F
Additional axial securing	+ 266°F

Temperature

Figure 2.4: Coefficients of friction dependent on the surface speed, p = 108 psi

Friction and wear

The coefficient of friction is dependent on the load that acts on the bushing. In iglide® A500 plastic bushings, the friction coefficient µ initially declines with increasing load. The most favorable coefficient of friction is attained from about 1,450 psi.

Friction and wear also depend to a high degree on the reverse partner. Thus extremely smooth shafts enhance not only the coefficient of friction, but also the bushing wear. Ground surfaces with and average medium roughness range of 16 to 38 rms are the most suitable

Coefficients of friction for iglide® A500 against steel
(Shaft finish = 40 rms, 50 HRC)

iglide® A500	Dry	Grease	Oil	Water
Coefficients of friction	0.10 - 0.40	0.09	0.04	0.04

Coefficients of friction

Wear resistance

Figure 2.5: Coefficients of friction dependent on the load, v = 1.96 fpm

Figure 10.6: Coefficients of friction dependent on the shaft surface (1050 hard chromed)

Fig. 2.7: Wear, rotating application with different shaft materials, load p = 108 psi, v = 98 fpm

Shaft materials

The diagrams display a summary of the results of tests with different shaft materials conducted with plastic bushings made of iglide® A500. The combination "iglide® A500/hard-chromed shaft" clearly stands out in rotating application. Up to about 290 psi, the wear of this combination remains largely independent of load.

With regard to oscillating movements against shafts of 1050 steel, the wear resistance is better than that of rotation under the same pressure.

Please contact us in case the shaft material scheduled by you is not included in these figures.

Shaft materials

Figure 10.8: Wear with various shaft materials in the rotating operation

Figure 10.9: Wear with various shaft materials, oscillating and rotating movement p = 290 psi

Important tolerances for iglide® A500 plastic bushings according to ISO 3547-1 after the press-fit.

Diameter d1 [inch]	Shaft h9 [inch]	iglide® A290 F10 [inch]
Up to 0.019685	0 - 0.00098425	+0.0002362 + 0.0018110
> 0.1181 to 0.2362	0 - 0.0011811	+0.0003937 + 0.0022835
> 0.2362 to 0.3937	0 - 0.00141732	+0.0005118 + 0.0027953
> 0.3937 to 0.7087	0 - 0.00169291	+0.0006299 + 0.0033858
> 0.7087 to 1.1811	0 - 0.00204724	+0.0007874 + 0.0040945
> 1.1811 to 1.9685	0 - 0.00244094	+0.0011811 + 0.0059055

Installation tolerances

iglide® A500 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	+
Strong acids	+
Weak alkaline	+
Strong alkaline	+

+ resistant 0 conditionally resistant - non-resistant

Figure 10.10: Influence of moisture absorption of iglide® A500 plastic bushings

Electrical properties

Specific volume resistance	> 10¹⁴ Ωcm
Surface resistance	> 10¹³ Ω

Chemical resistance

iglide® A500 plastic bushings have an excellent resistance to cleaning agents, greases, oils, bases and acids. The moisture absorption of the iglide® A500 plastic bushings is only 0.5% when saturated.

The humidity absorption of iglide® A290 plastic bushings amounts to about 1.7% in standard climatic conditions. The saturation point in water is at 7.3%, a disadvantage which must be accounted for by all means in applications in humid and wet areas.

Please contact us if there is any query about clearance design in humid applications.

Radioactive rays

Plastic bushings made of iglide® A500 figure among the most radiation-resistant bushings in the iglide® product range. The plastic bushings are resistant up to a radioactive intensity of 2 x 10⁵ Gy Higher radiations affect the material and can lead to the loss of important mechanical properties.