Change Language :
iglide® L250 - Material data
Materials table
General features
Unit
iglide® L250
Test method
Density
g/cm³
1.50
Color
Beige
Max. moisture absorption at 73° F/50% R. H.
Wt.-%
0.7
DIN 53495
Max. moisture absorption
Wt.-%
3.9
Coefficient of friction, dynamic against steel
µ
0.08 - 0.19
p x v value, max. (dry)
psi x fpm
11,500
Mechanical properties
Modulus of elasticity
psi
282,800
DIN 53457
Tensile strength at 68° F
psi
9,718
DIN 53452
Compressive Strength
psi
6,817
Maximum recommended surface pressure (68° F)
psi
6,527
Shore D hardness
68
DIN 53505
Physical and thermal properties
Upper long-term application temperature
°F
194
Upper short-term application temperature
°F
356
Lower 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
> 1010
DIN IEC 93
Surface resistance
Ω
> 1011
DIN 53482
Permissible p x v values for iglide® L250 running dry against a steel shaft, at 68° F.
Permitted p x v values
For iglide® L250 plastic bushings with 0.03 inches (1 mm) wall thickness in dry operation against a steel shaft, at 68° F, installed in a steel housing.
iglide® L250 is a bushing material for high rotary speeds, fast gliding movements and super coefficients of friction. The iglide® L250 material can feature these advantages particularly with low loads. Applications which feature these advantages are fans, small motors, fast-running sensors or the magnet technology.
Deformation under load and temperatures
Surface pressure
With increasing temperatures, the compressive strength of iglide® L250 plastic bushings decreases. The graph shows this inverse relationship. However, at the long term maximum temperature of +194 °F the permissible surface pressure is almost 2901 psi.
Maximum recommended surface pressure dependent on the temperature
Temperatures
The iglide® L250 plastic bushings can be used in temperatures from -40° F up to 194° F. The short-term maximum temperature is 356° F. Note that a mechanical securing of the bushing is recommended from temperatures of 131° F. Higher temperatures can also cause the bushing to lose its press-fit seating and move in the housing.
Coefficients of friction of iglide® L250 as a function of the running speed; p = 108 psi
Friction and wear
Low coefficients of friction are a big influence on the excellent characteristics of iglide® L250 plastic bushings. The best pairing of iglide® L250 is with 304 stainless steel shafts where coefficient of friction of 0.14 are already attained at low loads. Coefficients of friction below 0.1 have already been measured for values below 1,450 psi. In order to convey the excellent wear values to the application, loads in excess of 725 psi should be avoided.
Wear, rotating application with different shaft materials, load p = 108 psi, v = 98 fpm
Shaft materials
As shown in the graphs, a variety of shafts can be used at low loads and low rotation. The good coefficients of friction are maintained across a wide range of recommended shaft roughness values. With regards to loads greater than 145 psi the shaft material selection becomes more important.
Influence of moisture absorption of iglide® L250 plastic bushings
Radioactive rays
iglide® L250 plastic bushings are radiation resistant up to a radioactive intensity of 3 x 104 Gy. Higher radiation affects the material and may potentially lead to a notable lowering of value of an important mechanical property.