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Table 7. Guidance on the corrosion resistance of materials (see note)
NOTE. The figures quoted in this table present the following categories of resistance to corrosion.
Unless otherwise stated, resistance is quoted at ambient temperature.
Category 1: Recommended;
Category 2: Partially resistant;
Category 3: Not recommended
| Service condition | Hose and end fittings | End fittings | |||||
| Austenitic steels | Bronze | Nickel.alloy NA13 | Carbon Steels | Copper based allys | |||
| 304S11 | 316S11 | 321S31 | |||||
| Acetic acid | |||||||
| 5% to 20% agigtated or aerated | 1 | 1 | 1 | 3 | 3 | 3 | 3 |
| 50% to 20°C | 1 | 1 | 1 | 3 | 3 | 3 | 3 |
| 50% to 80%, boiling | 3 | 2 | 3 | 3 | 3 | 3 | 3 |
| 80% to 20°C | 1 | 1 | 1 | 3 | 1 | 3 | 3 |
| 100% to 20°C | 1 | 1 | 1 | 3 | 1 | 3 | 3 |
| 100%. Boiling | 3 | 2 | 3 | 3 | 2 | 3 | 3 |
| Acetic anhydride | 1 | 1 | 1 | 3 | 2 | 3 | 3 |
| Acetone, boiling | 1 | 1 | 1 | 1 | 1 | 3 | 1 |
| Acetyl chloride, boiling | 2 | 2 | 2 | 2 | 1 | 3 | 2 |
| Acetylene | |||||||
| Concentrated | 1 | 1 | 1 | 3 | 1 | 1 | 3 |
| Commericially pure | 1 | 1 | 1 | 3 | 1 | 1 | 3 |
| Acid salt mixture | 1 | 1 | 1 | 3 | 3 | 3 | 3 |
| Air | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Aluminium acetate, saturated | 1 | 1 | 1 | 3 | 1 | 3 | 3 |
| Aluminium chloride | |||||||
| 10 % quiescent | 3 | 3 | 3 | 3 | 2 | 3 | 3 |
| 25 % quiescent | 1 | 1 | 1 | 3 | 2 | 3 | 3 |
| Aluminium hydroxide, saturated | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Aluminium sulphate | |||||||
| 5% | 1 | 1 | 1 | 3 | 1 | 3 | 3 |
| 10 % to, 20°C | 1 | 1 | 1 | 3 | 1 | 3 | 3 |
| 10 %, boiling | 2 | 1 | 2 | 3 | 1 | 3 | 3 |
| saturated 20°C | 1 | 1 | 1 | 3 | 1 | 3 | 3 |
| saturated, boiling | 2 | 1 | 2 | 3 | 1 | 3 | 3 |
| Aluminium potassium sulphate (alum) | |||||||
| 2 % to 1 %, 20°C | 1 | 1 | 1 | 2 | 2 | 3 | 2 |
| 10 %, boiling | 2 | 1 | 2 | 3 | 2 | 3 | 3 |
| saturated | 3 | 2 | 3 | 3 | 2 | 3 | 3 |
| Ammonia (Anhydrous) | |||||||
| all concentrations | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| hot gas | 3 | 3 | 3 | 3 | 3 | 3 | 3 |
| Ammonia liqour | |||||||
| 20°C | 1 | 1 | 1 | 3 | 3 | 3 | 3 |
| boiling | 1 | 1 | 1 | 3 | 3 | 3 | 3 |
| Ammonium bromide | 2 | 1 | 2 | 3 | 2 | 3 | 3 |
| Amomonium carboante, 1% and 5% | 1 | 1 | 1 | 3 | 3 | 1 | 3 |
| Ammonium chloride | |||||||
| 1% | 1 | 1 | 1 | 3 | 3 | 2 | 3 |
| 10% | 1 | 1 | 1 | 3 | 3 | 3 | 3 |
| 28% | 2 | 1 | 2 | 3 | 3 | 3 | 3 |
| 50% | 2 | 1 | 2 | 3 | 3 | 3 | 3 |
| Ammonium dihydrogen orthophosphate | |||||||
| (Ammonium phosphate) 5% | 1 | 1 | 1 | 3 | 3 | 2 | 3 |
| Ammonium Hydrogen carbonate | |||||||
| (Ammonium bicarbonate) hot | 1 | 1 | 1 | 3 | 2 | 3 | 3 |
| Ammonium monophosphate | 1 | 1 | 1 | 3 | 2 | 2 | 3 |
| Ammonium nitrate, boiling | 1 | 1 | 1 | 3 | 2 | 3 | 3 |
| Ammonium oxalate, 5% | 1 | 1 | 1 | 3 | 3 | 2 | 3 |
| Ammonium perchlorate, 10%, boiling | 1 | 1 | 3 | 3 | 2 | 3 | |
| Ammonium peroxodisulphate | |||||||
| (Ammonium persulphate) 5% | 1 | 1 | 1 | 3 | 3 | 3 | 3 |
| Ammonia solution (Ammonium hydroxide) | |||||||
| all concentrations | 1 | 1 | 1 | 3 | 3 | 2 | 3 |
| Ammonium sulphate | |||||||
| 1%, aerated or agitated | 1 | 1 | 1 | 3 | 2 | 3 | 3 |
| 5%, aerated and agitated | 1 | 1 | 1 | 3 | 2 | 3 | 3 |
| 10%, saturated | 2 | 1 | 2 | 3 | 2 | 3 | 3 |
| Ammonium sulphite, 20 °C, boiling | 1 | 1 | 1 | 3 | 3 | 3 | 3 |
| Amyl acetate, concentrate | 1 | 1 | 1 | 1 | 1 | 2 | 1 |
| Amyl chloride | 1 | 1 | 1 | 2 | 2 | 3 | 2 |
| Aniline | |||||||
| 3% | 1 | 1 | 1 | 3 | 2 | 2 | 3 |
| concentrated crude | 1 | 1 | 1 | 3 | 2 | 1 | 3 |
| Argon (refrigerated liquid) | 1 | 1 | 1 | 1 | 1 | 3 | 1 |
| Barium carbonate | 1 | 1 | 1 | 1 | 2 | 2 | 1 |
| Barium chloride, 5%, saturated | 1 | 1 | 1 | 2 | 2 | 3 | 2 |
| Barium hydroxide, aqueous solution, hot | 1 | 1 | 1 | 1 | 2 | 2 | 1 |
| Barium nitrate, aqueous solution, hot | 1 | 1 | 1 | 3 | 2 | 2 | 3 |
| Barium sulphate (Barytes-blanc fixe) | 1 | 1 | 1 | 1 | 2 | 3 | 1 |
| Barium sulphide, saturated solution | 1 | 1 | 1 | 3 | 3 | 3 | 3 |
| Benzene (Benzol) 20 °C or hot | 1 | 1 | 1 | 1 | 2 | 2 | 1 |
| Benzoic Acid | 1 | 1 | 1 | 1 | 3 | 1 | 1 |
| Bitumen | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Butane | |||||||
| -50 °C | 1 | 1 | 1 | 1 | 1 | 2 | 1 |
| 20 °C | 1 | 1 | 1 | 1 | 1 | 2 | 1 |
| Butyl acetate | 1 | 1 | 1 | 3 | 2 | 3 | 3 |
| Butyric acid | |||||||
| 5% | 1 | 1 | 1 | 2 | 2 | 3 | 2 |
| aqueous solution, dilution of 0.964 g/L | 1 | 1 | 1 | 3 | 2 | 3 | 3 |
| Calcium carbonate | 1 | 1 | 1 | 3 | 1 | 1 | 3 |
| Calcium chlorate, dilute solution | 1 | 1 | 1 | 3 | 2 | 2 | 3 |
| Calcium chloride, dilute or concentrated solution | 2 | 1 | 2 | 2 | 3 | 3 | 2 |
| Calcium hypochlorite, 2% | 2 | 1 | 2 | 2 | 2 | 3 | 2 |
| Calcium hydroxide, 10 % to 20% | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Calcium sulphate, saturated | 1 | 1 | 1 | 1 | 1 | 2 | 1 |
| Carbonated water | 1 | 1 | 1 | 2 | 2 | 3 | 2 |
| Carbonic acid, saturated solution | 1 | 1 | 1 | 1 | 1 | 3 | 3 |
| Carbon dioxide | |||||||
| dry | 1 | 1 | 1 | 1 | 1 | 1 | 3 |
| moist | 1 | 1 | 1 | 3 | 1 | 2 | 1 |
| Carbon disulphide (Carbon bisulphide) | 1 | 1 | 1 | 2 | 2 | 2 | 1 |
| Carbon tetrachloride | |||||||
| CP | 1 | 1 | 1 | 1 | 1 | 2 | 1 |
| dry CP | 1 | 1 | 1 | 1 | 2 | 2 | 1 |
| commercial + 1 % wate | 3 | 3 | 3 | 2 | 2 | 3 | 2 |
| Cellulose | 1 | 1 | 1 | 3 | 1 | 3 | 3 |
| Chloracetic acid | 3 | 3 | 3 | 2 | 2 | 3 | 2 |
| Chlorbenzol, concentrated, pure, dry | 1 | 1 | 1 | 2 | 2 | 2 | 2 |
| Chlorine gas | |||||||
| dry | 3 | 3 | 3 | 2 | 2 | 2 | 2 |
| moist | 3 | 3 | 3 | 3 | 3 | 3 | 3 |
| Chlorinated water, saturated | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Chloroform | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Chromium(VI) oxide (Chromic acid) | |||||||
| 5% CP | 1 | 1 | 1 | 3 | 3 | 3 | 3 |
| 10% | 3 | 2 | 3 | 3 | 3 | 3 | 3 |
| Chromium plating bath | 1 | 1 | 1 | 3 | 3 | 2 | 3 |
| 1-chloro-2,4-dinitrobenzene (Dinitrochlorobenzene) | |||||||
| melted and solidified | 1 | 1 | 1 | 3 | 3 | 3 | 3 |
| Chloroethane (Ethyl chloride) | 1 | 1 | 1 | 2 | 1 | 2 | 2 |
| Citric acid | |||||||
| 5%, still | 1 | 1 | 1 | 1 | 2 | 3 | 2 |
| 15%, still, 20 °C | 1 | 1 | 1 | 2 | 2 | 3 | 3 |
| 15 %, boiling | 2 | 1 | 2 | 2 | 3 | 3 | 3 |
| Copper(II) acetate, saturated solution | 1 | 1 | 1 | 3 | 2 | 3 | 3 |
| Copper(III) carbonate, saturated solution | |||||||
| in 50 % NH4OH | 1 | 1 | 1 | 3 | 3 | 3 | 3 |
| Copper(II) cyanide, saturated solution | 1 | 1 | 1 | 3 | 2 | 3 | 3 |
| Copper(II) nitrate | |||||||
| 1% still, agitated and aerated | 1 | 1 | 1 | 3 | 3 | 3 | 3 |
| 5% still, agitated and aerated | 1 | 1 | 1 | 3 | 3 | 3 | 3 |
| 50% aqueous solution | 1 | 1 | 1 | 3 | 3 | 3 | 3 |
| Copper(II) sulphate | |||||||
| 5% agitated still or aerated | 1 | 1 | 1 | 2 | 3 | 3 | 2 |
| saturated solution | 1 | 1 | 1 | 2 | 3 | 3 | 2 |
| Creosote (coal tar) | 1 | 1 | 1 | 1 | 2 | 2 | 1 |
| Creosote oil | 1 | 1 | 1 | 2 | 2 | 2 | 2 |
| Cyanogen gas | 1 | 1 | 1 | 3 | 3 | 3 | 3 |
| Developing solutions | 1 | 1 | 1 | 3 | 3 | 3 | 3 |
| 1,2-Dichloroethylene (Dichloroethane) dry | 1 | 1 | 1 | 3 | 2 | 3 | 3 |
| Diethyl ether (Ether) | 1 | 1 | 1 | 1 | 2 | 2 | 1 |
| Disodium tetraborate (Borax) 5% | 1 | 1 | 1 | 1 | 2 | 2 | 1 |
| Distillery wort | 1 | 1 | 1 | 3 | 3 | 3 | 3 |
| Dyewood liquor | 1 | 1 | 1 | 3 | 2 | 3 | 3 |
| Ethanediol (Ethylene glycol) | 1 | 1 | 1 | 1 | 1 | 2 | 1 |
| Ethanol (Ethyl alcohol) 20 °C and boiling | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Ethyl acetate, concentrated solution | 1 | 1 | 1 | 1 | 2 | 2 | 1 |
| Ethylene chloride | 1 | 1 | 1 | 2 | 1 | 2 | 2 |
| Fluorine (gas) moist | 3 | 3 | 3 | 3 | 3 | 3 | 3 |
| Fluorosilicic (Hydrofluosilicic) acid | 3 | 3 | 3 | 2 | 2 | 3 | 2 |
| Formaldehyde, 40% solution | 1 | 1 | 1 | 1 | 1 | 2 | 1 |
| Formic acid | |||||||
| 5%, stil, 20 °С | 2 | 1 | 2 | 2 | 2 | 3 | 2 |
| 5%, still, 66 °С | 2 | 1 | 2 | 2 | 3 | 3 | 2 |
| Fuel oil | 1 | 1 | 1 | 1 | 2 | 2 | 1 |
| containing sulphuric acid | 3 | 2 | 3 | 3 | 2 | 3 | 3 |
| 2-Furaldehyde (Furfural) | 1 | 1 | 1 | 1 | 2 | 2 | 1 |
| Gelatin | 1 | 1 | 1 | 1 | 1 | 3 | 1 |
| Glue | |||||||
| dry | 1 | 1 | 1 | 2 | 2 | 1 | 2 |
| solution, acid | 2 | 1 | 2 | 3 | 2 | 2 | 3 |
| Glycerol (Glycerine) | 1 | 1 | 1 | 1 | 1 | 2 | 1 |
| Hydrochloric acid, all concentrations | 3 | 3 | 3 | 3 | 3 | 3 | 3 |
| Hydrocyanic acid | 1 | 1 | 1 | 3 | 2 | 3 | 3 |
| Hydrofluoric acid | 3 | 3 | 3 | 3 | 1 | 3 | 3 |
| Hydrogen peroxide | |||||||
| 20 °C | 2 | 1 | 2 | 3 | 2 | 3 | 3 |
| boiling | 2 | 1 | 2 | 3 | 2 | 3 | 3 |
| Hydrogen sulphide | |||||||
| dry | 1 | 1 | 1 | 1 | 3 | 2 | 1 |
| wet | 2 | 1 | 2 | 3 | 3 | 3 | 3 |
| Ink | 2 | 1 | 2 | 3 | 1 | 3 | 3 |
| Iodoform | 1 | 1 | 1 | 3 | 2 | 3 | 3 |
| Iron(II) chloride | |||||||
| (Ferrous chloride) saturated solution | 3 | 1 | 3 | 2 | 3 | 3 | 2 |
| Iron(III) chloride (Ferric chloride) | |||||||
| 1% solution, 20 °С | 2 | 1 | 2 | 3 | 3 | 3 | 3 |
| 1% solution, boiling | 3 | 3 | 3 | 3 | 3 | 3 | 3 |
| 5% solution agitated, aerated | 3 | 3 | 3 | 3 | 3 | 3 | 3 |
| Iron(III) hydroxide | |||||||
| (Ferric hydroxide)(hydrated iron oxide) | 1 | 1 | 1 | 3 | 2 | 3 | 3 |
| Iron(III) nitrate (Ferric nitrate) | |||||||
| 1% to 5 % quiescent or agitated | 1 | 1 | 1 | 3 | 3 | 3 | 3 |
| 1 % to 5% aerated | 1 | 1 | 1 | 3 | 3 | 3 | 3 |
| Iron(II) sulphate (Ferrous sulphate) dilute solution | 1 | 1 | 1 | 2 | 3 | 3 | 2 |
| Iron(III) sulphate (Ferric sulphate) | |||||||
| 1% to 5 % quiescent or agitated | 1 | 1 | 1 | 3 | 3 | 3 | 3 |
| 1% to 5% aerated | 1 | 1 | 1 | 3 | 3 | 3 | 3 |
| 10% | 1 | 1 | 1 | 3 | 3 | 3 | 3 |
| Kerosene | 1 | 1 | 1 | 1 | 2 | 2 | 1 |
| Lactic acid | |||||||
| 1%, 20°C | 1 | 1 | 1 | 2 | 2 | 3 | 2 |
| 1%, boiling | 1 | 1 | 1 | 3 | 2 | 3 | 3 |
| 5%, 20°C | 1 | 1 | 1 | 2 | 2 | 3 | 2 |
| 5%, boiling | 2 | 1 | 2 | 3 | 2 | 3 | 3 |
| 10%, 20°C | 2 | 1 | 2 | 3 | 2 | 3 | 2 |
| 10%, boiling | 3 | 2 | 3 | 3 | 2 | 3 | 3 |
| concentrated, 20 °С | 2 | 1 | 2 | 2 | 2 | 3 | 2 |
| concentrated, boiling | 3 | 2 | 3 | 3 | 2 | 3 | 3 |
| Lead diacetate (Lead acetate) 5% | 1 | 1 | 1 | 3 | 2 | 3 | 3 |
| Linseed oil | 1 | 1 | 1 | 2 | 1 | 2 | 2 |
| Magnesium chloride | |||||||
| 1%, quiescent, 20 °С | 1 | 1 | 1 | 2 | 1 | 3 | 2 |
| 1%, quiescent, hot | 3 | 2 | 3 | 2 | 1 | 3 | 2 |
| 5%, quiescent, 20 °С | 1 | 1 | 1 | 2 | 1 | 3 | 2 |
| 5%, quiescent, hot | 3 | 2 | 3 | 2 | 1 | 3 | 2 |
| Magnesium sulphate | 1 | 1 | 1 | 1 | 1 | 3 | 1 |
| Malic acid | 2 | 1 | 2 | 3 | 2 | 3 | 3 |
| Mash | 1 | 1 | 1 | 3 | 2 | 3 | 3 |
| Mercury | 1 | 1 | 1 | 3 | 3 | 1 | 3 |
| Methane (refrigerated liquid) | 1 | 1 | 1 | 1 | 1 | 3 | 1 |
| Methanol (Methyl alcohol) boiling | 3 | 2 | 3 | 1 | 1 | 3 | 1 |
| Mixed acids, 53 % H₂SO4 + 45% HNO3 | 1 | 1 | 1 | 3 | 3 | 3 | 3 |
| Molasses | 1 | 1 | 1 | 1 | 1 | 2 | 2 |
| Mustard | 1 | 1 | 1 | 3 | 2 | 3 | 3 |
| Naphtha | |||||||
| crude | 1 | 1 | 1 | 2 | 1 | 2 | 2 |
| pure | 1 | 1 | 1 | 2 | 1 | 2 | 2 |
| Naphthalene sulphonic acid | 1 | 1 | 1 | 3 | 1 | 3 | 3 |
| Nickel chloride solution | 1 | 1 | 1 | 2 | 2 | 3 | 3 |
| Nickel sulphate | 1 | 1 | 1 | 1 | 1 | 3 | 3 |
| Nitre cake | 2 | 1 | 2 | 3 | 2 | 3 | 3 |
| Nitric acid | |||||||
| 5%,50 %, 70 %, boiling | 1 | 1 | 1 | 3 | 3 | 3 | 3 |
| 65%, 20°C | 1 | 1 | 1 | 3 | 3 | 3 | 3 |
| 65 %, boiling | 2 | 2 | 2 | 3 | 3 | 3 | 3 |
| concentrated, 20°C | 1 | 1 | 1 | 3 | 3 | 3 | 3 |
| concentrated, boiling | 3 | 3 | 3 | 3 | 3 | 3 | 3 |
| fuming concentrated, 43 °C | 1 | 1 | 1 | 3 | 3 | 3 | 3 |
| fuming concentrated, boiling | 3 | 3 | 3 | 3 | 3 | 3 | 3 |
| Nitrogen (refrigerated liquid) | 1 | 1 | 1 | 1 | 1 | 3 | 1 |
| Nitrous acid, 5% | 1 | 1 | 1 | 3 | 3 | 3 | 3 |
| Oils, crude | 1 | 1 | 1 | 2 | 1 | 3 | 2 |
| Oils, vegetable, mineral | 1 | 1 | 1 | 2 | 1 | 3 | 2 |
| Oleic acid | 1 | 1 | 1 | 2 | 2 | 2 | 2 |
| Orthoboric acid (Boric acid) | |||||||
| 5% solution, 20 °С | 1 | 1 | 1 | 1 | 2 | 3 | 1 |
| 5% solution, boiling | 1 | 1 | 1 | 1 | 2 | 3 | 2 |
| saturated solution, 20 °C | 1 | 1 | 1 | 2 | 2 | 3 | 3 |
| saturated solution, boiling | 1 | 1 | 1 | 3 | 2 | 3 | 3 |
| Orthophosphoric acid (Phosphoric acid) | |||||||
| 1%, 20°C | 1 | 1 | 1 | 3 | 2 | 3 | 3 |
| 1%, boiling | 1 | 1 | 1 | 3 | 2 | 3 | 3 |
| 1% 3.1 bar, 140 °С | 1 | 1 | 1 | 3 | 2 | 3 | 3 |
| 5% quiescent, or agitated | 1 | 1 | 1 | 3 | 2 | 3 | 3 |
| 5% aerated | 1 | 1 | 1 | 3 | 2 | 3 | 3 |
| 10 % quiescent | 3 | 1 | 3 | 3 | 2 | 3 | 3 |
| 10% agitated or aerated | 3 | 2 | 3 | 3 | 2 | 3 | 3 |
| 10%, 50%, boiling | 1 | 1 | 1 | 3 | 3 | 3 | 3 |
| 80%,20 °C | 3 | 3 | 3 | 3 | 2 | 3 | 3 |
| 80%.110 °C | 3 | 3 | 3 | 3 | 3 | 3 | 3 |
| 85%, boiling | 3 | 3 | 3 | 3 | 3 | 3 | 3 |
| Oxalic acid | |||||||
| 5%, 10.%, 20 °С. | 1 | 1 | 1 | 2 | 2 | 3 | 3 |
| 10%, boiling | 3 | 3 | 3 | 2 | 2 | 3 | 3 |
| 25 %, 50%, boiling | 3 | 3 | 3 | 2 | 1 | 3 | 3 |
| Oxygen (refrigerated liquid) | 1 | 1 | 1 | 1 | 1 | 3 | 1 |
| Paraffin, hot | 1 | 1 | 1 | 1 | 1 | 2 | 1 |
| Petrol | 1 | 1 | 1 | 1 | 1 | 2 | 1 |
| Petroleum ether | 1 | 1 | 1 | 3 | 2 | 2 | 3 |
| Phenol | 1 | 1 | 1 | 3 | 2 | 2 | 1 |
| Picric acid | 1 | 1 | 1 | 3 | 3 | 3 | 3 |
| Potassium bromide | 2 | 1 | 2 | 2 | 2 | 3 | 2 |
| Potassium carbonate | |||||||
| 1%,20°C | 1 | 1 | 1 | 2 | 1 | 2 | 2 |
| hot | 1 | 1 | 1 | 3 | 1 | 2 | 3 |
| Potassium chlorate saturated at 100 °С | 1 | 1 | 1 | 3 | 3 | 2 | 3 |
| Potassium chloride | |||||||
| 1%, quiescent | 1 | 1 | 1 | 2 | 1 | 3 | 3 |
| 1%, agitated or aerated | 1 | 1 | 1 | 2 | 1 | 3 | 3 |
| 5%, quiescent | 1 | 1 | 1 | 2 | 1 | 3 | 3 |
| 5%, agitated or aerated | 1 | 1 | 1 | 2 | 1 | 3 | 3 |
| 5%, boiling | 1 | 1 | 1 | 2 | 1 | 3 | 3 |
| Potassium chromium sulphate | |||||||
| 5% | 1 | 1 | 1 | 2 | 3 | 3 | 3 |
| dilution of 1.6 g/L | 3 | 3 | 3 | 3 | 3 | 3 | 3 |
| Potassium cyanide | 1 | 1 | 1 | 3 | 2 | 2 | 3 |
| Potassium dichromate (Potassium bichromate) | |||||||
| 25%, 20°C | 1 | 1 | 1 | 3 | 2 | 3 | 3 |
| 25%, boiling | 1 | 1 | 1 | 3 | 2 | 3 | 3 |
| Potassium hexacyanoferrate(IШ( (Potassium ferricyanide) | |||||||
| 5%,25 %, 20 °C | 1 | 1 | 1 | 3 | 2 | 3 | 3 |
| 25%, boiling | 1 | 1 | 1 | 3 | 2 | 3 | 3 |
| Potassium hexacyanoferrate(II) (Potassium ferrocyanide) | |||||||
| 5% | 1 | 1 | 1 | 3 | 2 | 3 | 3 |
| Potassium hydrogen oxalate (Potassium oxalate) | 1 | 1 | 1 | 3 | 3 | 3 | 3 |
| Potassium hydroxide | |||||||
| 5% | 1 | 1 | 1 | 2 | 1 | 2 | 3 |
| 27% | 1 | 1 | 1 | 2 | 1 | 2 | 3 |
| 50% | 2 | 1 | 2 | 2 | 1 | 3 | 3 |
| Potassium hypochlorite | 2 | 2 | 2 | 3 | 3 | 3 | 3 |
| Potassium nitrate | |||||||
| 1%,5% still or agitated | 1 | 1 | 1 | 2 | 1 | 3 | 2 |
| 1%,5% aerated | 1 | 1 | 1 | 2 | 1 | 3 | 2 |
| 50%, 20°C | 1 | 1 | 1 | 2 | 1 | 3 | 2 |
| 50 %, boiling | 1 | 1 | 1 | 3 | 1 | 3 | 3 |
| molten | 1 | 1 | 1 | 3 | 3 | 3 | 3 |
| Potassium permanganate, 5% | 1 | 1 | 1 | 3 | 3 | 2 | 3 |
| Potassium sulphate | |||||||
| 1%,5% still or agitated | 1 | 1 | 1 | 1 | 2 | 2 | 2 |
| 1%,5% aerated, 20 °С | 1 | 1 | 1 | 1 | 2 | 2 | 2 |
| hot | 1 | 1 | 1 | 1 | 2 | 3 | 2 |
| Potassium sulphite (salt) | 1 | 1 | 1 | 3 | 3 | 3 | 3 |
| Propane | |||||||
| -50°C | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| 20 °C | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Pyrogallol (Pyrogallic acid) | 1 | 1 | 1 | 3 | 3 | 3 | 3 |
| Quinine bisulphate, dry | 2 | 1 | 2 | 3 | 3 | 3 | 3 |
| Quinine sulphate, dry | 1 | 1 | 1 | 2 | 2 | 2 | 2 |
| Resin | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Sea water | 3 | 2 | 3 | 2 | 2 | 2 | 2 |
| Silver bromide | 2 | 1 | 2 | 3 | 3 | 3 | 3 |
| Silver nitrate | 1 | 1 | 1 | 3 | 3 | 3 | 3 |
| Soap | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Sodium acetate, moist | 1 | 1 | 1 | 3 | 3 | 2 | 3 |
| Sodium carbonate | |||||||
| 5%, 66°C | 1 | 1 | 1 | 2 | 1 | 2 | 2 |
| 5%,50 %, boiling | 1 | 1 | 1 | 2 | 1 | 2 | 2 |
| molten | 3 | 3 | 3 | 3 | 1 | 3 | 3 |
| Sodium chloride | |||||||
| 5%, still | 1 | 1 | 1 | 2 | 1 | 3 | 3 |
| 20%, aerated | 1 | 1 | 1 | 2 | 1 | 3 | 3 |
| saturated, 20 °C | 1 | 1 | 1 | 2 | 1 | 3 | 3 |
| saturated, boiling | 2 | 1 | 2 | 2 | 1 | 3 | 3 |
| Sodium cyanide | 1 | 1 | 1 | 3 | 3 | 2 | 3 |
| Sodium fluoride, 5 % solution | 2 | 1 | 2 | 1 | 1 | 3 | 1 |
| Sulphuric acid | |||||||
| 5%, 10 % | 3 | 2 | 3 | 2 | 3 | 3 | 3 |
| 50% | 3 | 3 | 3 | 3 | 3 | 3 | 3 |
| concentrated, 20 °С | 1 | 1 | 1 | 2 | 3 | 3 | 3 |
| concentrated, boiling | 3 | 3 | 3 | 2 | 3 | 3 | 3 |
| Sulphurous acid | |||||||
| saturated | 3 | 2 | 3 | 2 | 3 | 3 | 3 |
| saturated, 4 bar pressure | 3 | 2 | 3 | 2 | 3 | 3 | 3 |
| saturated, 8 bar pressure | 3 | 2 | 3 | 2 | 3 | 3 | 3 |
| 10 bar pressure | 3 | 2 | 3 | 2 | 3 | 3 | 3 |
| Tannic acid | |||||||
| 20 °C | 1 | 1 | 1 | 1 | 3 | 3 | 2 |
| 66 °C | 1 | 1 | 1 | 1 | 3 | 3 | 2 |
| Tanning liquor | 1 | 1 | 1 | 3 | 1 | 3 | 3 |
| Tar | 1 | 1 | 1 | 1 | 3 | 2 | 1 |
| Tartaric acid | |||||||
| 10%, 20°C | 1 | 1 | 1 | 1 | 2 | 3 | 2 |
| 10 %, 50 %, boiling | 2 | 1 | 2 | 1 | 2 | 3 | 2 |
| Tin(IV) chloride (Stannic chloride solution) | |||||||
| (dilution of 1.21 g/L) | 3 | 3 | 3 | 3 | 3 | 3 | 3 |
| Tin(II) chloride (Stannous chloride) | |||||||
| saturated | 3 | 1 | 3 | 3 | 3 | 3 | 3 |
| Trichloroacetic acid | 3 | 3 | 3 | 2 | 3 | 3 | 3 |
| Trichloroethylene | |||||||
| dry | 1 | 1 | 1 | 1 | 1 | 3 | 1 |
| moist | 3 | 3 | 3 | 2 | 3 | 3 | 2 |
| 3,4,5 Trihydroxybenzoic acid (Gallic acid) | |||||||
| 5% | 1 | 1 | 1 | 3 | 2 | 3 | 3 |
| saturated | 1 | 1 | 1 | 3 | 2 | 3 | 3 |
| Varnish | 1 | 1 | 1 | 1 | 1 | 2 | 1 |
| Vegetable juices | 1 | 1 | 1 | 2 | 2 | 2 | 3 |
| Vinegar fumes | 2 | 1 | 2 | 2 | 3 | 3 | 3 |
| Vinegar, still, agitated or aerated | 1 | 1 | 1 | 2 | 3 | 3 | 3 |
| Water, potable | 1 | 1 | 1 | 1 | 1 | 2 | 1 |
| Whisky | 1 | 1 | 1 | 1 | 1 | 3 | 2 |
| Wine, all phases of processing and storing | 1 | 1 | 1 | 3 | 2 | 3 | 3 |
| Yeast | 1 | 1 | 1 | 3 | 1 | 3 | 3 |
| Zinc chloride | |||||||
| 5% still | 1 | 1 | 1 | 3 | 2 | 3 | 3 |
| 20 °C boiling | 2 | 2 | 2 | 3 | 2 | 3 | 3 |
| Zinc cyanide, moist | 1 | 1 | 1 | 3 | 3 | 3 | 3 |
| Zinc nitrate, solution | 1 | 1 | 1 | 3 | 3 | 3 | 3 |
| Zinc sulphate | |||||||
| 4% | 1 | 1 | 1 | 2 | 2 | 3 | 3 |
| 25% | 1 | 1 | 1 | 2 | 2 | 3 | 3 |
| saturated | 1 | 1 | 1 | 2 | 2 | 3 | 3 |
| A.3.5 Contact with zinc and other non-ferrous metals | A.3.6.2.1.2 BS 1449 : Part 2, steel 316S11 |
| At temperatures over 450 °C, either under working conditions or as a result of a plant fire, zinc can rapidly penetrate and embrittle austenitic stainless steel and high nickel alloys.End fittings or braid wire which have been galvanized or paints containing metallic zinc should not be used. For further information see Guidance Note PM 13, from the Health and Safety Executive, Zinc Embrittlement of Austenitic Stainless Steel¹). Other non-ferrous metals, e.g. lead and tin, may cause damage similar to that caused by zinc. |
This material offers improved resistance to pitting corrosion but, since it is a non-stabilized alloy, carbon precipitation can be a problem where carbon steel end fittings are used. |
| A 3.6 Guidance on the choice of materials | A.3.6.2.1.3 BS 1449: Part 2, steel 304S11 |
| A 3.6.1 General | This material is commonly used where good corrosion resistance is required. |
| Operating temperature may affect the choice of hose materials from the point of view of resistance to corrosion; data on fluid compatibility are given in table 7. Most service requirements in industry can be met by selecting from the materials listed in table 1. |
A.3.6.2.2 Nickel based alloys |
| A.3.6.2.2.1 BS 3073, NA 16 | |
| A 3.6.2 Hose materials | A high nickel alloy resistant to stress corrosion cracking and having good resistance to sulphuric and phosphoric acids. |
| A 3.6.2.1 Austenitic stainless steels | A.3.6.2.2.3 BS 3073, NA 14 |
| A 3.6.2.1.1 BS 1449: Part 2, steel 321S31 | The alloys included under this designation are immune to stress corrosion cracking and exhibit a good resistance to high temperature oxidation and corrosion. |
| This material is commonly used where good corrosion resistance and satisfactory mechanical properties over a wide temperature range are required. The material is stabilized and, therefore, is resistant to corrosion problems associated with welding. |
A.3.6.2.2.4 BS 3073, NA 13 |
| A nickel copper alloy widely used in marine and chemical processing applications and also in applications involving contact with chlorine |
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| A.3.6.2.3 Copper based alloys | |
| Copper based alloys are used mainly in areas where sparking can be a danger and for applications involving contact with sea water flowing at a rate of less than 1 m/s. Copper based alloys should not be used where there is a risk of flame impingement. |