Plastics & Polymers Reference Page

This list of Plastics and Polymers that we use incorporates an “inertness factor” that ranks the relative inertness of the material on a scale from zero (not inert) to 10 (most inert). This is purely intended as a guide only – in reality no such inertness scale exists because every material has resistance limitations based on other factors (temperature, time, humidity, etc.)

Abbreviation used Expanded name Inertness factor
PPS Polyphenelyne Sulfide 6
PTFE Polytetrafluoroethylene 9
PEEK Polyetherether Ketone 8
POM Polyoxymethylene 3
EPDM Ethylene Propylene Diene 3
FKM Fluorinated elastomer 6
FFKM Perfluoro elastomer 9
PSU Polysulfone
ETFE Ethylene Tetrafluoroethylene
PP Polypropylene
PCTFE/CTFE (Poly)Chlorotrifluoroethylene

PPS Resilient, chemically inert material typically used with high concentration chemicals, high pressure fluids, and/or fluids with entrained particulates. Less inert than PTFE and is more susceptible to chemical attack at higher temperatures.

PTFE Relatively soft, chemically inert material typically used with biological media and high concentration chemicals requiring the utmost level of purity and resistance to chemical attack. Its low durometer and susceptibility to cold flow make it a poor choice for applications with entrained particulates.

PEEK Resilient, chemically inert material typically used in similar applications to PPS but with better chemical resistance at higher temperatures.

POM Also known as Acetal / Acetal resin. Cost effective material with durability comparable to both PPS and PEEK when used with non-aggressive chemicals. Least chemically inert of our standard body materials.

EPDM Cost effective and durable material used with minimally aggressive chemicals, high pressure fluids, etc. Least chemically inert of our standard diaphragm materials and generally offers less precise operation than with PTFE.

FKM Cost effective alternative to FFKM with a greater chemical resistance than EPDM and significantly less cold flow issues than both. Less inert than FFKM and generally offers less precise operation than with PTFE.

FFKM Resilient, chemically inert material used in similar applications as PTFE but suitable for higher levels of entrained particulates and higher pressure. Susceptible to cold flow and generally offers less precise operation than with PTFE. Relative high cost.

For Material Data Sheets for Silicone Select™ and Bio-Chem (C-Flex) tubing visit our Download Center.

* All the trademarked names remain the trademark of their respective owners and are used here for guidance only and do not imply their use by Bio-Chem Fluidics.