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igus® inc.

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igus® inc.

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iglide® A350 - Material data

Materials table

General features Unit iglide® A350 test method
Density g/cm³ 1,42
Colour light blue
Max. moisture absorption at 73°F/50% R. H. Wt.-% 0,6 DIN 53495
Max. moisture absorption Wt.-% 1,9
Coefficient of friction, dynamic, against steel µ 0,10 - 0,20
P x v value, max. (dry) psi x fpm 11,500

Mechanical properties
Modulus of elasticity psi 290,100 DIN 53457
Tensile strength at 68° F psi 15,950 DIN 53452
Compressive strength psi 11,310
Permissible static surface pressure (68° F) psi 8,702
Shore D hardness 76 DIN 53505

Physical and thermal properties
Upper long-term application temperature °F +356
Upper short-term application temperature °F +410
Lower application temperature °F -148
Thermal conductivity [W/m x K] 0,24 ASTM C 177
Coefficient of thermal expansion (at 73° F) [K-1 x 10-5] 8 DIN 53752

Electrical properties
Specific volume resistance Ωcm > 1011 DIN IEC 93
Surface resistance Ω > 1011 DIN 53482

Plastic Bushings Permitted p x v values




Permissible p x v values for iglide® A350 plastic bushings running dry against a steel shaft, at 68°F

 
Permitted p x v values

FDA compliant and wear-resistant at high temperatures.

A very universal bushing for applications in the food and pharmaceutical industries. Thanks to the FDA conformity, iglide® A350 plastic bushings can be used wherever unpackaged foodstuffs are processed. With their tribological and thermal properties they are genuine all-rounders in the food industry.

deformation under load and temperature

Deformation under load and temperatures

 
Surface Pressure



The graph shows the elastic deformation of iglide® A350 during radial loading. At the recommended maximum surface pressure of 2900 psi the deformation is less than 5%.

Maximum surface speeds

fpm Rotating Oscillating Linear
Continuous 196 157 492
Short-term 236 177 590

Permitted surface speeds

iglide® A350 plastic bushings are suitable for low to medium speeds in both rotating and oscillating applications. Even linear motions can often be realized with iglide® A350.

With high sliding ,speeds, iglide® J or iglide® L250 can be interesting alternatives because the wear rate of these materials is better.

static surface

Recommended maximum permissible static surface pressure of iglide® A350 as a result of the temperature.

 
Temperatures

Its temperature resistance makes iglide® A350 an ideal material for a bushings in the food industry. The typical temperatures here reach up to +266°F, which is ideally covered by iglide® A350. Application temperatures up to +410°F are permitted on the short term. Please note that at temperatures over +284°F, the pressfit forces of the bushings may decrease and an additional axial securing device is recommended.
The wear rate of the iglide® A350 plastic bushings increases only minimally with higher temperatures. Tests have shown good wear results at +212°F on all tested shaft materials

iglide® A350 Application temperature
Minimum - 148 °F
Upper, long-term + 356 °F
Upper, short-term + 410 °F
Additional axial securing + 284 °F

bushing coefficients of friction

Coefficients of friction as a function of the running speed; p = 145 psi

 
plastic bushing coefficients of friction

Coefficients of friction as a function of the load, v = 1.96 fpm

 
Friction and wear

The coefficients of friction of iglide® A350 on a steel shaft is in the mid range. The friction decreases at temperatures, which is quite unusual in dry operation. The graph shows the connection. The wear rates of all tests with iglide® A350 show good results at a low level. The most wear resistant ones are often found among the iglide® plastic bushings for food contact.

iglide® A350 Dry Grease Oil Water
Coefficients of friction µ 0,1 - 0,2 0,09 0,04 0,04

Coefficients of friction for iglide® A350 against steel (Shaft finish = 40 rms, 50 HRC)

Coefficient of friction as a function of the shaft surface (1050 hard chromed and ground steel)

 
shaft materials for plastic bushings

Wear, rotating application with different shaft materials, p = 145 psi, v = 59 fpm

 
Shaft Materials

The corrosion-resistant steels are rather considered natural for use in the food industry. The trials were therefore carried out especially on such materials. It has been shown that there is no clear favorite 440B and hard chrome-plated steel are both suitable. Hard anodized aluminum is also well suited for both linear and rotating movements.

plastic bushing pressure

Wear with various shaft materials in the rotating operation , as a function of the pressure

 
plasting bushings load

Wear on oscillating application with different shaft materials depending on the load

 

Medium Resistance
Alcohols +
Hydrocarbons, chlorinated + to 0
Greases, oils, without additives +
Fuels +
Weak acids +
Strong acids +
Weak alkaline +
Strong alkaline +
+ resistant      0 partially resistant      - non-resistant
All specifications at room temperature [+68°F]


Electrical properties

Specific volume resistance > 1011 Ωcm
Surface resistance > 1011 Ω

Chemical Resistance

iglide® A350 plastic bushings are resistant to diluted acids and alkalis, alcohols and detergents. They are also resistant to most lubricants. The iglide® A350 plastic bushings are resistant to common cleaning agents used in the food industry. iglide® A350 is affected by esters, ketones, chlorinated hydrocarbons, aromatics and highly polar solvents.

Radioactive rays

iglide® A350 plastic bushings are radiation resistant up to a radiation intensity of 2 x 102 Gy.

UV-resistant

iglide A350® plastic bushings are well resistant against UV rays.

Vacuum

In vacuum, iglide® A350 degases. The application in vacuum is possible only for dry bushings.

Electrical properties

iglide® A350 plastic bushings are electrically insulating.

Influence of moisture absorption of iglide® A350 plastic bushings

 
Moisture Absorption

The moisture absorption of iglide® A350 is low and can be disregarded when using standard bushings. Even at full saturation the iglide® A350 does not absorb more than 1.9% of water.

Maximum moisture absorption
by +23 °C/50 % r. F. 0,6 weight-%
Max. water absorption 1,9 weight-%

Diameter
d1 [mm]
Shaft h9
[mm]
iglide® A350
F10 [mm]
Housing H7
[mm]
Up to 3 0 - 0,025 +0,006 +0,046 0 +0,010
> 3 bis 6 0 - 0,030 +0,010 +0,058 0 +0,012
> 6 bis 10 0 - 0,036 +0,013 +0,071 0 +0,015
> 10 bis 18 0 - 0,043 +0,016 +0,086 0 +0,018
> 18 bis 30 0 - 0,052 +0,020 +0,104 0 +0,021
> 30 to 50 0 - 0,062 +0,025 +0,125 0 +0,025
> 50 to 80 0 - 0,074 +0,030 +0,150 0 +0,030

Installation tolerances

iglide® A350 plastic bushings are standard bushings for shafts with h-tolerance (recommended minimum h9). The bushings 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 bushing automatically adjusts to the F10 tolerance.