Technical Information - PTFE
Technical Information - PTFE
Chemical Resistance Guide of PTFE & Filled PTFE
Chemical Resistance of Virgin PTFE:
The chemical resistance of Virgin PTFE is excellent. It is stable in most aggressive and corrosive media, exceptions being liquid or dissolved alkali metals, flourine and other extremely potent oxidisers.
PTFE is not chemically resistive to
- Moltem or dissolved Alkali metals – Sodium, Potassium, Rubidium, Cesium, Francium
- Fluorine Gas
- Fluorine compounds & complexes at elevated temperature
Chemical Resistance of Filled PTFE:
The chemical resistance of Filled PTFE compositions to number of Chemicals is given below. In general carbon and glass filled compositions give better performance in chemical service.
| Chemical | Filler | ||
|---|---|---|---|
| Carbon/ Graphite |
Glass | Bronze | |
| Acetaldehyde | A | A | A |
| Acetone | A | A | A |
| Aluminum Sulphate | A | A | B |
| Ammonium chloride | A | A | C |
| Ammonium hydroxide | A | B | C |
| Aniline | A | A | C |
| Benzene | A | A | A |
| Brine | A | A | A |
| Bromine (anhydrous) | C | B | C |
| Carbon Disulphide | A | A | A |
| Chloroacetic acid | A | A | B |
| Chlorobenzene | A | A | A |
| Chloroform | A | A | A |
| Chromic acid | B | B | C |
| Citric acid | A | A | A |
| Diethyl ether | A | A | A |
| Ethylene glycol | A | A | A |
| Fatty acids | A | A | A |
| Ferric Chloride | A | A | C |
| Ferric sulphate | A | A | C |
| Fluorosilicic acid | B | C | C |
| Formic acid | A | A | A |
| Freon (liquid) | A | A | A |
| Hydro boric acid | A | B | C |
| Hydrochloric acid | A | B | C |
| Hydrocyanic acid | A | B | C |
| Hydrogen sulphide (solution) | A | C | C |
| Lead acetate | A | A | C |
| Chemical | Filler | ||
|---|---|---|---|
| Carbon/ Graphite |
Glass | Bronze | |
| Maleic acid | A | A | B |
| Mercury salts | A | A | C |
| Molasses | A | A | B |
| Naphtha | A | A | B |
| Naphthalene | A | A | B |
| Nickel salts | A | A | A |
| Nitric acid | C | B | C |
| Nitro benzene | A | A | A |
| Phenol | A | B | A |
| Phosphoric acid | A | A | C |
| Picric acid | A | A | A |
| Pyridine | A | A | C |
| Salicylic acid | A | A | B |
| Silver nitrate | A | A | C |
| Sodium carbonate | A | A | A |
| Sodium hydroxide | A | B | A |
| Sodium nitrite | A | A | A |
| Sodium peroxide | B | A | C |
| Sodium silicate | A | c | A |
| Sodium sulphide | A | A | C |
| Starch | A | A | A |
| Sulphuric acid | B | A | C |
| Tallow | A | A | A |
| Tannic acid | A | A | A |
| Tartaric acid | A | A | A |
| Trichloroethylene | A | A | B |
| Zinc chloride | A | A | C |
