Stanyl has an excellent abrasion resistance (or wear resistance) and
outperforms most other engineering/high performance plastics under most
conditions but especially at higher temperatures or high torque/loads.
Although the coefficients of friction of standard grades of these materials
are quite similar, Stanyl outperforms its competitors. The main reason is its
higher PV rating, which permits higher pressures or velocities to be used.
Where other materials fail when using demanding application conditions (high
temperature, high loads, high velocities, harsh chemical environment,
vibrations) due to melting (POM, PA6), brittle behavior (PPS, PPAs), low
stiffness at high temperatures (POM, PPS, PA6, PA66, PPAs) or high
abrasiveness (PPS), Stanyl will deliver smooth and reliable performance (see
Modified Stanyl grades with even better wear properties are available in
unreinforced as well as glass fiber reinforced form. Its smooth and tough
surface, combined with its stiffness at elevated temperatures, high melting
point, high fatigue and vibration resistance, high resistance against crack
propagation and resistance against oil and greases, make Stanyl an ideal
material for sliding parts like valve lifter guides,
chain tensioners(see graphs below),
gears, bushings and thrust washers.
Comparison between Stanyl, PA66 and POM with respect to the Taber Abrasion
Test (ASTM D1044).