The figures quoted in the table below present the following categories of resistance to corrosion:
Category 1 – recommended
Category 2 – partially resistant
Category 3 – not recommended
| Corrosion Resistance of Materials ( based on BS 6501 – 2004 ) | |||||||
| Media / Service Condition | 304 | 316 | 321 | Bronze 510 | Monel 400 | Carbon steel | Copper- based |
| Acetic acid 5 % to 20 % agitated or aerated | 1 | 1 | 1 | 3 | 2 | 3 | 3 |
| Acetic acid 50 %, 70°F | 1 | 1 | 1 | 3 | 3 | 3 | 3 |
| Acetic acid 50 % to 80 %, boiling | 3 | 2 | 3 | 3 | 3 | 3 | 3 |
| Acetic acid 80 %, 70°F | 1 | 1 | 1 | 3 | 1 | 3 | 3 |
| Acetic acid 100 %, boiling | 3 | 2 | 3 | 3 | 2 | 3 | 3 |
| Acetic acid 100 %, 70°F | 1 | 1 | 1 | 3 | 1 | 3 | 3 |
| Acetic anhydride | 1 | 1 | 1 | 3 | 2 | 3 | 3 |
| Aceton, boiling | 1 | 1 | 1 | 1 | 1 | 3 | 1 |
| Acetyl chloride, boiling | 2 | 2 | 2 | 2 | 1 | 3 | 2 |
| Formaldehyde, 40 % solution | 1 | 1 | 1 | 1 | 1 | 2 | 1 |
| Fuel oil | 1 | 1 | 1 | 1 | 2 | 2 | 1 |
| Fuel oil containing sulfuric 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 |
| Glue 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, 70°F | 2 | 1 | 2 | 3 | 2 | 3 | 3 |
| Hydrogen peroxide, boiling | 2 | 1 | 2 | 3 | 2 | 3 | 3 |
| Hydrogen sulfide, dry | 1 | 1 | 1 | 1 | 3 | 2 | 1 |
| Hydrogen sulfide, 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, 70°F | 2 | 1 | 2 | 3 | 3 | 3 | 3 |
| Iron (III) chloride (Ferric chloride), 1 % solution, boiling | 3 | 3 | 3 | 3 | 3 | 3 | 3 |
| Iron (III) chloride (Ferric chloride), 5 % solution agitated, aerated | 3 | 3 | 3 | 3 | 3 | 3 | 3 |
| Iron (II) 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 |
| Iron (III) nitrate (Ferric nitrate) 1 % to 5 % aerated | 1 | 1 | 1 | 3 | 3 | 3 | 3 |
| Iron (II) sulfate (Ferrous sulfate) dilute solution | 1 | 1 | 1 | 2 | 3 | 3 | 2 |
| Iron (III) sulfate (Ferric sulfate) 1 % to 5 % quiescent or agitated | 1 | 1 | 1 | 3 | 3 | 3 | 3 |
| Iron (III) sulfate (Ferric sulfate) 1 % to 5 % quiescent or aerated | 1 | 1 | 1 | 3 | 3 | 3 | 3 |
| Iron (III) sulfate (Ferric sulfate) 10 % | 1 | 1 | 1 | 3 | 3 | 3 | 3 |
| Kerosene | 1 | 1 | 1 | 1 | 2 | 2 | 1 |
| Lactic acid 1%, 70°F | 1 | 1 | 1 | 2 | 2 | 3 | 2 |
| Lactic acid 1 %, boiling | 1 | 1 | 1 | 3 | 2 | 3 | 3 |
| Lactic acid 5 %, 70°F | 1 | 1 | 1 | 2 | 2 | 3 | 2 |
| Lactic acid 5 %, boiling | 2 | 1 | 2 | 3 | 2 | 3 | 3 |
| Lactic acid 10 %, 70°F | 2 | 1 | 2 | 3 | 2 | 3 | 2 |
| Lactic acid 10 %, boiling | 3 | 2 | 3 | 3 | 2 | 3 | 3 |
| Lactic acid concentrated, 70°F | 2 | 1 | 2 | 2 | 2 | 3 | 2 |
| Lactic acid 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, 70°F | 1 | 1 | 1 | 2 | 1 | 3 | 2 |
| Magnesium chloride 1 % quiescent, hot | 3 | 2 | 3 | 2 | 1 | 3 | 2 |
| Magnesium chloride 5 % quiescent, 70°F | 1 | 1 | 1 | 2 | 1 | 3 | 2 |
| Magnesium chloride 5 % quiescent, hot | 3 | 2 | 3 | 2 | 1 | 3 | 2 |
| Magnesium sulfate | 1 | 1 | 1 | 1 | 1 | 3 | 1 |
| Malice 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 |
| Acetylene concentrated | 1 | 1 | 1 | 3 | 1 | 1 | 3 |
| Acetylene commercially 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 |
| Aluminium chloride 25 %, quiescent | 1 | 1 | 1 | 3 | 2 | 3 | 3 |
| Aluminium hydroxide, saturated | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Aluminium sulfate 5 % | 1 | 1 | 1 | 3 | 1 | 3 | 3 |
| Aluminium sulfate 10 %, 70°F | 1 | 1 | 1 | 3 | 1 | 3 | 3 |
| Aluminium sulfate 10 %, boiling | 2 | 1 | 2 | 3 | 1 | 3 | 3 |
| Aluminium sulfate saturated, 70°F | 1 | 1 | 1 | 3 | 1 | 3 | 3 |
| Aluminium sulfate saturated, boiling | 2 | 1 | 2 | 3 | 1 | 3 | 3 |
| Aluminium potassium sulfate (alum) 2% to 1 %, 70°F | 1 | 1 | 1 | 2 | 2 | 3 | 3 |
| Aluminium potassium sulfate (alum) 10 %, boiling | 2 | 1 | 2 | 3 | 2 | 3 | 3 |
| Aluminium potassium sulfate (alum) saturated | 3 | 2 | 3 | 3 | 2 | 3 | 3 |
| Ammonia (anhydrous) all concentrations | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Ammonia (anhydrous) hot gas | 3 | 3 | 3 | 3 | 3 | 3 | 3 |
| Ammonia liquor, 70°F | 1 | 1 | 1 | 3 | 3 | 3 | 3 |
| Ammonia liquor, boiling | 1 | 1 | 1 | 3 | 3 | 3 | 3 |
| Ammonium bromide | 2 | 1 | 2 | 3 | 2 | 3 | 3 |
| Ammonium carbonate, 1 % and 5 % | 1 | 1 | 1 | 3 | 3 | 1 | 3 |
| Ammonium chloride, 1 % | 1 | 1 | 1 | 3 | 1 | 2 | 3 |
| Ammonium chloride, 10 % | 1 | 1 | 1 | 3 | 2 | 3 | 3 |
| Ammonium chloride, 28 % | 2 | 1 | 2 | 3 | 2 | 3 | 3 |
| Ammonium chloride, 50 % | 2 | 1 | 2 | 3 | 2 | 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 oxalate, 5 % | 1 | 1 | 1 | 3 | 3 | 2 | 3 |
| Ammonium perchlorate, 10 %, boiling | 1 | 1 | 1 | 3 | 3 | 2 | 3 |
| Ammonium peroxodisulfate (Ammonium persulfate), 5 % | 1 | 1 | 1 | 3 | 3 | 3 | 3 |
| Ammonium solution (Ammonium hydroxide), all concentration | 1 | 1 | 1 | 3 | 3 | 2 | 3 |
| Ammonium sulfate 1 %, aerated or agitated | 1 | 1 | 1 | 3 | 2 | 3 | 3 |
| Ammonium sulfate 5 %, aerated and agitated | 1 | 1 | 1 | 3 | 2 | 3 | 3 |
| Ammonium sulfate 10 %, saturated | 2 | 1 | 2 | 3 | 2 | 3 | 3 |
| Ammonium sulfate, 70°F, 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 |
| Aniline 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 | 1 | 2 | 2 | 1 |
| Barium sulfate, (Barytes-blanc fixe) | 1 | 1 | 1 | 1 | 2 | 3 | 1 |
| Barium sulfide, saturated solution | 1 | 1 | 1 | 3 | 3 | 3 | 3 |
| Benzene (Benzol) 70°F 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, -58°F | 1 | 1 | 1 | 1 | 1 | 3 | 1 |
| Butane, 70°F | 1 | 1 | 1 | 1 | 1 | 2 | 1 |
| Butyl acid, 5 % | 1 | 1 | 1 | 2 | 2 | 3 | 2 |
| Butyl aqueous solution, dilution of 0.13 oz/gal | 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 chlorite, dilute or concentrate solution | 2 | 1 | 2 | 2 | 3 | 3 | 2 |
| Calcium hypochlorite, 2 % | 2 | 1 | 2 | 2 | 3 | 3 | 2 |
| Calcium hydroxide, 10 % to 20 % | 1 | 1 | 1 | 1 | 1 | 3 | 1 |
| Calcium sulfate, saturated | 1 | 1 | 1 | 1 | 2 | 3 | 1 |
| Carbonated water | 1 | 1 | 1 | 2 | 3 | 3 | 2 |
| Carbonic acid, saturated solution | 1 | 1 | 1 | 1 | 3 | 3 | 3 |
| Carbon dioxide dry | 1 | 1 | 1 | 1 | 1 | 1 | 3 |
| Carbon dioxide moist | 1 | 1 | 1 | 3 | 1 | 2 | 3 |
| Carbone disulfide (Carbon bisulfide) | 1 | 1 | 1 | 2 | 2 | 2 | 1 |
| Carbon tetrachloride CP | 1 | 1 | 1 | 1 | 1 | 2 | 1 |
| Carbon tetrachloride dry CP | 1 | 1 | 1 | 1 | 2 | 2 | 1 |
| Carbon tetrachloride commercial + 1 % water | 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 |
| Chlorine gas, 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 |
| Chromium (VI) oxide (Chromic acid) 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 |
| Citric acid 15 %, still, 70°F | 1 | 1 | 1 | 2 | 2 | 3 | 3 |
| Citric acid 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 |
| Copper (II) nitrate 5 % still, agitated and aerated | 1 | 1 | 1 | 3 | 3 | 3 | 3 |
| Copper (II) nitrate 50 % aqueous solution | 1 | 1 | 1 | 3 | 3 | 3 | 3 |
| Copper (II) sulfate 5 % agitated still or aerated | 1 | 1 | 1 | 2 | 3 | 3 | 2 |
| Copper (II) sulfate 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) 70°F 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 (Hydrofluosilicid acid) | 3 | 3 | 3 | 2 | 2 | 3 | 2 |
| Sodium carbonate, molten | 3 | 3 | 3 | 3 | 1 | 3 | 3 |
| Sodium chloride 5 %, still | 1 | 1 | 1 | 2 | 1 | 3 | 3 |
| Sodium chloride 20 %, aerated | 1 | 1 | 1 | 2 | 1 | 3 | 3 |
| Sodium chloride saturated, 70°F | 1 | 1 | 1 | 2 | 1 | 3 | 3 |
| Sodium chloride 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 |
| Sodium hydrogen carbonate (Sodium bisulfate) solution | 1 | 1 | 1 | 2 | 2 | 3 | 3 |
| Sodium hydrogen carbonate (Sodium bisulfate) saturated solution | 3 | 3 | 3 | 2 | 2 | 3 | 3 |
| Sodium hydroxide | 1 | 1 | 1 | 2 | 1 | 2 | 3 |
| Sodium hypochlorite | 3 | 3 | 3 | 3 | 3 | 3 | 3 |
| Sodium nitrate | 1 | 1 | 1 | 1 | 2 | 2 | 1 |
| Sodium perchlorate, 10 % | 1 | 1 | 1 | 3 | 3 | 3 | 3 |
| Sodium phosphate | 1 | 1 | 1 | 2 | 2 | 2 | 2 |
| Sodium sulfate 5 % | 1 | 1 | 1 | 2 | 2 | 3 | 3 |
| Naphtha crude | 1 | 1 | 1 | 2 | 1 | 2 | 2 |
| Naphtha pure | 1 | 1 | 1 | 2 | 1 | 2 | 2 |
| Naphthalene sulfonic acid | 1 | 1 | 1 | 3 | 1 | 3 | 3 |
| Nickel chloride solution | 1 | 1 | 1 | 2 | 2 | 3 | 3 |
| Nickel sulfate | 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 |
| Nitric acid 65 %, 70°F | 1 | 1 | 1 | 3 | 3 | 3 | 3 |
| Nitric acid 65 %, boiling | 2 | 2 | 2 | 3 | 3 | 3 | 3 |
| Nitric acid concentrated, 70°F | 1 | 1 | 1 | 3 | 3 | 3 | 3 |
| Nitric acid concentrated, boiling | 3 | 3 | 3 | 3 | 3 | 3 | 3 |
| Nitric acid fuming concentrated, 110°F | 1 | 1 | 1 | 3 | 3 | 3 | 3 |
| Nitric acid 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, 70°F | 1 | 1 | 1 | 1 | 2 | 3 | 1 |
| Orthoboric acid (Boric acid) 5 % solution, boiling | 1 | 1 | 1 | 1 | 2 | 3 | 1 |
| Orthoboric acid (Boric acid) saturated solution, 70°F | 1 | 1 | 1 | 2 | 2 | 3 | 3 |
| Orthoboric acid (Boric acid) saturated solution, boiling | 1 | 1 | 1 | 3 | 2 | 3 | 3 |
| Orthophosphoric acid (Phosphoric acid) 1 %, 70°F | 1 | 1 | 1 | 3 | 2 | 3 | 3 |
| Orthophosphoric acid (Phosphoric acid) 1 %, boiling | 1 | 1 | 1 | 3 | 2 | 3 | 3 |
| Orthophosphoric acid (Phosphoric acid) 1 % to 3 %, 15 psi, 285°F | 1 | 1 | 1 | 3 | 2 | 3 | 3 |
| Orthophosphoric acid (Phosphoric acid) 5 %, quiescent, or agitated | 1 | 1 | 1 | 3 | 2 | 3 | 3 |
| Orthophosphoric acid (Phosphoric acid) 5 %, aerated | 1 | 1 | 1 | 3 | 2 | 3 | 3 |
| Orthophosphoric acid (Phosphoric acid) 10 %, quiescent | 3 | 1 | 3 | 3 | 2 | 3 | 3 |
| Orthophosphoric acid (Phosphoric acid) 10 %, agitated or aerated | 3 | 2 | 3 | 3 | 2 | 3 | 3 |
| Orthophosphoric acid (Phosphoric acid) 10 % to 50 %, boiling | 1 | 1 | 1 | 3 | 3 | 3 | 3 |
| Orthophosphoric acid (Phosphoric acid) 80 %, 70°F | 3 | 3 | 3 | 3 | 2 | 3 | 3 |
| Orthophosphoric acid (Phosphoric acid) 80 %, 230°F | 3 | 3 | 3 | 3 | 3 | 3 | 3 |
| Orthophosphoric acid (Phosphoric acid) 85 %, boiling | 3 | 3 | 3 | 3 | 3 | 3 | 3 |
| Oxalic acid 5 %, 10 %, 70°F | 1 | 1 | 1 | 2 | 2 | 3 | 3 |
| Oxalic acid 10 %, boiling | 3 | 3 | 3 | 2 | 2 | 3 | 3 |
| Oxalic acid 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 %, 70°F | 1 | 1 | 1 | 2 | 1 | 2 | 2 |
| Potassium carbonate 1 %, hot | 1 | 1 | 1 | 3 | 1 | 2 | 3 |
| Potassium chlorade saturated at 212°F | 1 | 1 | 1 | 3 | 3 | 2 | 3 |
| Potassium chloride 1 % quiescent | 1 | 1 | 1 | 2 | 1 | 3 | 3 |
| Potassium chloride 1 % agitated or aerated | 1 | 1 | 1 | 2 | 1 | 3 | 3 |
| Potassium chloride 5 % quiescent | 1 | 1 | 1 | 2 | 1 | 3 | 3 |
| Potassium chloride 5 % agitated or aerated | 1 | 1 | 1 | 2 | 1 | 3 | 3 |
| Potassium chloride 5 %, boiling | 1 | 1 | 1 | 2 | 1 | 3 | 3 |
| Potassium chromium sulfate 5 % | 1 | 1 | 1 | 2 | 3 | 3 | 3 |
| Potassium chromium dilution of 0.21 oz/gal | 3 | 3 | 3 | 3 | 3 | 3 | 3 |
| Potassium cyanide | 1 | 1 | 1 | 3 | 2 | 2 | 3 |
| Potassium dichromate (Potassium bichromate) 25 %, 70°F | 1 | 1 | 1 | 3 | 2 | 3 | 3 |
| Potassium dichromate (Potassium bichromate) 25 %, boiling | 1 | 1 | 1 | 3 | 2 | 3 | 3 |
| Potassium hexacyanoferrate (III) (Potassium ferrocyanide) 5 %, 25 %, 70°F | 1 | 1 | 1 | 3 | 2 | 3 | 3 |
| Potassium hexacyanoferrate (III) (Potassium ferrocyanide) 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) 5 % | 1 | 1 | 1 | 2 | 1 | 2 | 3 |
| Potassium hydrogen oxalate (Potassium oxalate) 27 % | 1 | 1 | 1 | 2 | 1 | 2 | 3 |
| Potassium hydrogen oxalate (Potassium oxalate) 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 |
| Potassium nitrate 1 %, 5 % aerated | 1 | 1 | 1 | 2 | 1 | 3 | 2 |
| Potassium nitrate 50 %, 70°F | 1 | 1 | 1 | 2 | 1 | 3 | 2 |
| Potassium nitrate 50 %, boiling | 1 | 1 | 1 | 2 | 1 | 3 | 2 |
| Potassium nitrate 50 %, molten | 1 | 1 | 1 | 3 | 3 | 3 | 3 |
| Potassium permanganate, 5 % | 1 | 1 | 1 | 3 | 3 | 2 | 3 |
| Potassium sulfate 1 %, 5 % or agitated | 1 | 1 | 1 | 1 | 2 | 2 | 2 |
| Potassium sulfate 1 %, 5 % aerated, 70°F | 1 | 1 | 1 | 1 | 2 | 2 | 2 |
| Potassium sulfate hot | 1 | 1 | 1 | 1 | 2 | 3 | 2 |
| Potassium sulfate (salt) | 1 | 1 | 1 | 3 | 3 | 3 | 3 |
| Propane -58°F | 1 | 1 | 1 | 1 | 1 | 3 | 1 |
| Propane 70°F | 1 | 1 | 1 | 1 | 1 | 2 | 1 |
| Pyrogallol (Pyrogallic acid) | 1 | 1 | 1 | 3 | 3 | 2 | 3 |
| Quinine bisulfate, dry | 2 | 1 | 2 | 3 | 3 | 3 | 3 |
| Quinine sulfate, dry | 1 | 1 | 1 | 2 | 2 | 3 | 2 |
| Resin | 1 | 1 | 1 | 1 | 1 | 3 | 1 |
| Sea water | 3 | 2 | 3 | 2 | 2 | 3 | 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 | 2 | 1 |
| Sodium acetate, moist | 1 | 1 | 1 | 3 | 2 | 3 | 3 |
| Sodium carbonate 5 %, 150°F | 1 | 1 | 1 | 2 | 1 | 2 | 2 |
| Sodium carbonate 5 %, 50 %, boiling | 1 | 1 | 1 | 2 | 1 | 2 | 2 |
| Propyl Bromide | 3 | 2 | 3 | 2 | 2 | 3 | 3 |
| Diesel (fuel) | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Natural gas | 1 | 1 | 1 | 1 | 1 | 2 | 1 |
| Sodium sulfate 10 % | 1 | 1 | 1 | 2 | 2 | 3 | 3 |
| Sodium thiosulfate saturated solution | 1 | 1 | 1 | 3 | 1 | 3 | 3 |
| Sodium thiosulfate acid fixing bath (hypo) | 1 | 1 | 1 | 3 | 2 | 3 | 3 |
| Sodium thiosulfate 25 % solution | 1 | 1 | 1 | 3 | 2 | 3 | 3 |
| Sodium thiosulfite (Sodium hyposulfite) | 1 | 1 | 1 | 3 | 2 | 3 | 3 |
| Steam | 1 | 1 | 1 | 1 | 1 | 3 | 2 |
| Stearic acid | 1 | 1 | 1 | 2 | 2 | 3 | 3 |
| Starch, aqueous solution | 1 | 1 | 1 | 3 | 2 | 3 | 3 |
| Strontium hydroxide | 1 | 1 | 1 | 3 | 3 | 3 | 3 |
| Strontium nitrate solution | 1 | 1 | 1 | 3 | 2 | 3 | 3 |
| Sulfur moist | 2 | 1 | 2 | 3 | 2 | 3 | 3 |
| Sulfur molten | 1 | 1 | 1 | 3 | 1 | 3 | 3 |
| Sulfur chloride, dry | 3 | 3 | 3 | 1 | 2 | 3 | 1 |
| Sulfur dioxide gas, moist | 2 | 1 | 2 | 2 | 3 | 3 | 2 |
| Sulfur dioxide gas, dry | 1 | 1 | 1 | 1 | 2 | 3 | 1 |
| Sulfur acid 5 %, 10 % | 3 | 2 | 3 | 2 | 3 | 3 | 3 |
| Sulfur acid 50 % | 3 | 3 | 3 | 3 | 3 | 3 | 3 |
| Sulfur acid concentrated, 70°F | 1 | 1 | 1 | 2 | 3 | 3 | 3 |
| Sulfur acid concentrated, boiling | 3 | 3 | 3 | 2 | 3 | 3 | 3 |
| Sulfurous acid saturated | 3 | 2 | 3 | 2 | 3 | 3 | 3 |
| Sulfurous acid saturated, 60 psi pressure | 3 | 2 | 3 | 2 | 3 | 3 | 3 |
| Sulfurous acid saturated, 120 psi pressure | 3 | 2 | 3 | 2 | 3 | 3 | 3 |
| Sulfurous acid saturated, 150 psi pressure | 3 | 2 | 3 | 2 | 3 | 3 | 3 |
| Tannic acid, 70°F | 1 | 1 | 1 | 1 | 3 | 3 | 2 |
| Tannic acid, 150°F | 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 %, 70°F | 1 | 1 | 1 | 1 | 2 | 3 | 2 |
| Tartaric acid 10 %, 50 %, boiling | 2 | 1 | 2 | 1 | 2 | 3 | 2 |
| Tin (VI) chloride (Stannous chloride) (dilution of 0.16 oz/gal) | 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 |
| Trichloroethylene, moist | 3 | 3 | 3 | 2 | 3 | 3 | 2 |
| Trichloroethylene, 3,3,5-Trihydroxybenzoic acid (Gallic acid) 5 % | 1 | 1 | 1 | 3 | 2 | 3 | 3 |
| Trichloroethylene, 3,3,5-Trihydroxybenzoic acid (Gallic acid) 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 |
| Zinc chloride 70°F, 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 sulfate 4 % | 1 | 1 | 1 | 2 | 2 | 3 | 3 |
| Zinc sulfate 25 % | 1 | 1 | 1 | 2 | 2 | 3 | 3 |
| Zinc sulfate saturated | 1 | 1 | 1 | 2 | 2 | 3 | 3 |
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