Chemical compatibility of filter materials and sealings

Legend:

  recommended   limited application   not recommended -  insufficient data

Medium Filter material Sealing
Polyamide (Nylon6+66) Fluorine plastic (PVDF) Polyether sulfone (PES) Fluorine plastic-4 (PTFE) Polypro-pylene (PP) Glass-fiber (Glass) Stainless steel Silicone Viton EPDM PTFE

Acids

Acetic acid, 96%
Acetic acid, 25%
cetic acid, 5%
Boric acid
Hydrochloric acid, 37%
Fluohydric acid, 50%
Nitric acid, 25%
Nitric acid, 25%
Sulphuric acid, 25%
Sulphuric acid, 98% -
Phosphoric acid, conc.

Bases (alkalis)

Ammonia hydroxide, 1n
Potassium hydroxide, 3n
Sodium hydroxide, 3n
Sodium hydroxide, 6n
Sodium hydrate

Spirits and Solvents

Aceton
Butanol
Ethanol
Isopropanol
Isobutanol
Methanol
Butyl acetate
Ethyl acetate
Methyl acetate
Isopropyl acetate - -
Diethyl ether
Dioxane
Isopropylester - - -
Tetrahydrofuran
Ethylene glycol
Glycerol
Propylene glycol
Benzene
Toluene
Xylene
Chloroform
Dichloromethane
Tetrachloroethylene
Trichlorethylene
Dimethylformamide
Dimethylsulfoxide
Petrol
Kerosine
Acetonitrile
Pyridine

Oils/Fats

Vegetable oils
Lubricants

Gases/Air

Inert gases, air, nitrogen, proteins
Methane

The following table can only be used as a reference; chemical stability can be affected by the process conditions. Please, keep in mind the parameters, which can significantly degrade chemical stability if changed: temperature, time, concentration.

Sealing materials Designation Temperature limits Main applications
Silicone rubber Silicone -50°С to +250°С Food, neutral and slightly aggressive liquids, air, ozone.
Ethylene propylene rubber EPDM -30°С to +150°С Alcohols, ketones, glycols, alkalis, acids.
Fluoroplastic PTFE -30°С to +235°С Highly corrosive liquids and gases.
Fluorocarbon rubber Viton -21°С to +200°С Acids, aromatic hydrocarbons, chlorinated hydrocarbons, fatty hydrocarbons, alcohols.
Nitrile rubber Buna-N -30°С to +121°С Fatty hydrocarbons, alcohols, glycols, food liquids, salt solutions, liquids with low acid content, solutions of chlorides, nitrates and phosphates.

View in pdf format