Properties & Grades of Machined PPS
There's a lot to like about PPS's material properties. PPS has exceptional chemical resistance that makes its bearing grades especially favorable for the chemical industry or caustic environments. In particular, its resistance to acids, alkalis, ketones, and hydrocarbons lend PPS stellar structural performance in harsh chemicals.
Additionally, PPS materials are inert to steam as well as strong bases, fuels and acids. Combine that with a low coefficient of thermal expansion and zero moisture absorption, and you get a material that is ideal for continuous use in corrosive or hostile environments. PPS has replaced stainless steel for a lot of industrial applications for this reason.
Most impressively, PPS will not dissolve at temperatures below approximately 200 °C, no matter what solvent is used. In fact, all grades of PPS share UL94 V-0 flammability ratings, without requiring flame retardant additives, resulting in an excellent material for aircraft where flame resistance is paramount.
| property |
item no |
unit |
value |
| 1 |
density |
g/cm³ |
1.43 |
| 2 |
water absorption (23ºC in air) |
% |
0.03 |
| 3 |
tensile strength |
Mpa |
75 |
| 4 |
tensile strain at break |
% |
5 |
| 5 |
compressive stress (at 2% nominal strain) |
Mpa |
55 |
| 6 |
charpy impact strength (unnotched) |
KJ/m² |
25 |
| 7 |
charpy impact strength (notched) |
KJ/m² |
3.5 |
| 8 |
tensile modulus of elasticity |
Mpa |
3700 |
| 9 |
ball indentation hardness |
N/mm² |
180 |
| 10 |
rockwell hardness |
-- |
M84 |
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