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iglide® A200 - Material data

Materials table

General features Unit iglide® A200 Test method
Density g/cm³ 1.14
Color White
Max. humidity absorption at 73 ° F/50% R. H. Wt.-% 1.5 DIN 53495
Max. water absorption Wt.-% 7.6
Coefficient of surface friction, dynamic, against steel µ 0.10 - 0.40
p x v value, max. (dry) psi x fpm 2900

Mechanical properties
Modulus of elasticity psi 362,500 DIN 53457
Tensile strength at 68 ° F psi 16,820 DIN 53452
Compressive strength psi 7,830
Permissible static surface pressure (68° F) psi 2,610
Shore D hardness 81 DIN 53505

Physical and thermal properties
Max. long-term application temperature °F 176
Max. short-term application temperature °F 338
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 ] 10 DIN 53752

Electrical properties
Specific volume resistance Ωcm > 1013 DIN IEC 93
Surface resistance Ω > 1012 DIN 53482


Permitted p x v values

For iglide® A200 plastic bushings with 0.03937 (1 mm) wall thickness in dry operation against a steel shaft, at 68 ° F, installed in a steel housing.

Plastic bushings made of iglide® A200 are suitable for application in direct contact with foodstuffs. Hence they are the ideal solution for bushing positions in machines for the food industry, medical equipment manufacturing, for small equipment for households, etc. As the admixture of lubricants should be foregone in favor of food compatibility, the thermoplastic composition of iglide® A200 is particularly adjusted for abrasion resistance. In addition the iglide® A200 is characterized by its capacity to embed dirt and by its quiet operating behavior.


plastic bushing radial loads Figure 8.2: Deformation under load and temperatures

Compressive Strength

The high abrasion resistance, the insensitivity to dirt and the ability to operate dry enable it to dispense with the otherwise complex casings for lubricated bushings. Figure 8.2 shows the elastic deformation of iglide® A200 with radial loads. Under the maximum recommended surface pressure of 2610 psi, the deformation amounts to less than 2%. A plastic deformation is negligible up to this radial load. It is however also dependent on the period of exposure.


Maximum surface speed

fpm Rotating Oscillating Linear
Constant 157 118 393
Short-term 295 216 590

Permitted surface speeds

iglide® A200 is developed for low surface speeds. Maximum speeds up to 157 fpm(rotating) and 393 fpm (linear) respectively are permitted for continuous application in dry operation. These specified values state the limits to which the long-term permitted temperature rises due to frictional heat. In practice these limit values are not always reached due to interactions.


maximum bushing temp Figure 8.3: Maximum recommended surface pressure dependent on the temperature

Temperatures

The short-term permitted maximum temperature is 338° F. With increasing temperatures, the compressive strength of iglide® A200 plastic bushings decreases. Fig. 8.3 clarifies this connection. The temperatures prevailing in the plastic bushing system also have an influence on the bushing wear.

Temperature limits

iglide® A200 Application temperature
Minimum - 40 °F
Max. long-term + 176 °F
Max. short-term + 338 °F
Additional axial securing + 122 °F


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

Friction and wear

The coefficient of friction alters like the wear resistance with increasing load. In iglide® A200 plastic bushings, the friction coefficient µ slightly rises with increasing load. Friction and wear also depend to a high degree on the reverse partner. The shaft can be a decisive factor for an ideal pairing of the bushing system. Thus extremely smooth shafts enhance not only the coefficient of friction, but also the bushing wear. The most suited are smoothed surfaces with an average surface finish of Ra = 16 to 24 rms.

Coefficients of friction for iglide® A200 against steel
(Shaft finish = 40 rms, 50 HRC)

iglide® A200 Dry Grease Oil Water
Coefficients of friction µ 0.10 - 0.40 0.09 0.04 0.04

plastic bushing load Figure 2.5: Coefficients of friction dependent on the load, v = 1.96 fpm
surface finish of shaft Figure 8.6: Coefficients of friction dependent on the shaft surface (1050 hard chromed)

shaft materials for plastic bushings 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 bushing made of iglide® A200.

The combination "iglide® A200/hard-chromed shaft" clearly stands out. Up to a range of about 362 psi, the wear of this combination remains largely independent of load.

In pivoting applications below a load p = 290 psi, the wear of iglide® A200 plastic bushings is higher than in rotating applications with equal load. Here the HR carbon steel shaft is a positive exception with its much less coefficient of wear.

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

rotating wear Figure 8.8: Wear with various shaft materials in the rotational applications
pivioting wear Figure 8.9: Wear with different shaft materials, oscillating and rotating movement, p = 290 psi

Important tolerances for iglide® A200 plastic bushings according to ISO 3547-1 after the press-fit.

Diameter
d1 [inches]
Shaft h9
[inches]
iglide® A200
D11 [inches]
Up to 0.019685 0 - 0.0009842 +0.0007874 + 0.0031496
> 0.1181 to 0.2362 0 - 0.0011811 +0.0011811 + 0.0041339
> 0.2362 to 0.3937 0 - 0.0014173 +0.0015748 + 0.0051181
> 0.3937 to 0.7087 0 - 0.0016929 +0.0019685 + 0.0062992
> 0.7087 to 1.1811 0 - 0.0020472 +0.0025591 + 0.0076772
> 1.1811 to 1.9685 0 - 0.0024409 +0.0031496 + 0.0094488

Installation tolerances

iglide® A200 plastic bushings are standard bushings for shafts with h-tolerance (recommended minimum h9).

After the installation in a housing bore with the tolerance H7, the inner diameter of the bushing automatically adjusts to the D11 tolerance.


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

Figure 8.10: Influence of moisture absorption of iglide® A200 plastic bushings


Electrical properties

Specific forward resistance > 1013 Ωcm
Surface resistance > 1012 Ω

Chemical resistance

iglide® A200 plastic bushings have strong resistance to chemicals. They are also resistant to most lubricants. iglide® A200 plastic bushings are not attacked by most weak organic and inorganic acids.

The moisture absorption of iglide® A200 plastic bushings amounts to about 1,5% in standard climatic conditions. The saturation limit in water is 7,6%. This should be considered according to application conditions.

Radioactive rays

iglide® A200 plastic bushings are radiation resistant up to a radioactive intensity of 2 x 104 Gy. Higher radiations affect the material and can lead to the loss of important mechanical properties.

UV-resistant

iglide® A200 plastic bushings are resistant to UV rays.

Vacuum

The iglide® A200 plastic bushings can be used in vacuum only restrictedly.

Electrical properties

iglide® A200 plastic bushings are electrically insulating.