|Chemical||Teflon® (PTFE)||PCTFE/PFA||PEEK*||Vespel®||PPS||Conductive nylon**||Stainless steel||Silicone rubber***||Viton® rubber****|
|Ammonia||A||A||A||B to C||A||B to C||A||C||B to C|
|Hydrochloric acid||A||A||B||B to C||B||B to C||C||B to C||A|
|Hydrofluoric acid||A||A||C||B to C||B||B to C||B to C||C||A to B|
|Hydrogen peroxide||A||A||A||B to C||B||B to C||A to B||B||A|
|Nitric acid||A||A||B to C||B to C||B||B to C||A to B||B to C||A|
|Sodium hydroxide||A||A||A||B to C||A||B to C||B||B to C||B to C|
|Sulphuric acid||A||A||C||B to C||B||B to C||C||C||A to B|
C: Not recommended
The information presented on this chart is only intended as a reference. Chemical compatibility is affected by length of exposure, temperature, pressure, concentration and other factors. We recommend that the effect of the individual chemical is tested before use.
*Conductive PEEK has similar properties to PEEK.
** Conductive MC nylon has similar properties to Conductive nylon.
*** Conductive Silicone rubber has similar properties to Silicone rubber.
**** Conductive Viton® rubber has similar properties to Viton® rubber.
PEEK is a unique, semi-crystalline, high-temperature engineering thermoplastic with excellent chemical and fatigue resistance and thermal stability, exhibiting superior mechanical and electrical properties. ESD PEEK is carbon filled to provide good characteristics for the dissipation of static electricity. It has excellent retention of mechanical properties up to 300°C in a steam or high-pressure water environment. It is inert to all common solvents and resists a wide range of organic and inorganic liquids.
PPS is a high-temperature, semi-crystalline material. It has good mechanical properties and excellent chemical resistance at elevated temperatures. PPS has been compounded extensively and many different types of properties are available.
More information about Dupont Vespel can be found here.
Teflon is a fluoropolymer resin with exceptional resistance to high temperatures, chemical reaction, corrosion and stress cracking. The mechanical toughness, electrical and low-friction properties of Teflon make it a preferred plastic for a host of applications and different processing techniques.
More information about Teflon can be found here.
PCTFE is a partly crystalline polymer fluoroplastic, which is harder than all other materials of this kind. It is particularly characterised by its high deformation resistance. PCTFE is comparable to PTFE, with a restricted thermal resistance.