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James Walker® Gaskets & Jointings > Metallic & semi-metallic gaskets



  Metallic & semi-metallic gaskets
Chemical suitability guide
 
Notation:
A= Fully resistant (less than 0.009mm penetration per month)
B = Satisfactory (0.009mm-0.09mm per month)
C = Fairly resistant (0.09mm-0.025mm per month)
D = Slightly resistant (0.25mm-0.9mm per month)
E = Non-resistant (over 0.9mm per month)
0 = Insufficient data available.
Where chemical compatibility is not indicated, or a chemical is not listed, please consult our technical services team for a recommendation to be made.
 
METAL COMPONENTS STAINLESS STEEL 304L, 321, 347 STAINLESS STEEL 316, 316L NICKEL 200 MONEL 400 INCONEL 625
STEAM A A A A A
STEAM CONDENSATE A A A A A
WATER A A A A A
AIR A A A A A
ACETIC ACID (50% @ boiling) C B B A B
ACETIC ANHYDRIDE (boiling) A A A A A
ACETONE (boiling) A A A A A
ALUMINIUM CHLORIDE (20°C) D C B B C
AMMONIA LIQUOR (boiling) A A C C A
AMMONIUM CHLORIDE (50%, boiling) B A A A B
AMMONIUM NITRATE (boiling) A A E E B
ANILINE (concentrated @ 20°C) A A A A A
BARIUM CHLORIDE (boiling) B A B A B
CHROMIUM PLATING BATH (20°C) A A C C A
CITRIC ACID (15%, boiling) B A B A A
COPPER SULPHATE (saturated, boiling) A A C C C
CREOSOTE/COAL TAR (hot) A A A A A
ETHER (20°C) A A A A A
ETHYL ALCOHOL (boiling) A A A A A
ETHYL CHLORIDE (20°C) A A A A A
ETHYLENE CHLORIDE (20°C) A A A A A
FERRIC CHLORIDE (1% @ 20°C) B A B C C
FLUORINE (20°C) E E A A A
FORMALDEHYDE (Formalin 40%) B A A A A
FORMIC ACID (5% @ 65°C, still) B A A A A
FUEL OIL (hot) A A B B A
FUEL OIL (+sulphuric acid) C B B B B
HYDROCHLORIC ACID (20°C) E E B B C
HYDROFLUOSILICIC ACID (20°C) E D A A B
HYDROGEN PEROXIDE (boiling) B A 0 0 0
HYDROGEN SULPHIDE (wet) B A A A A
KEROSENE A A A A A
LACTIC ACID (10% @ 65°C) C B B B B
LINSEED OIL (20°C) A A A A A
MAGNESIUM CHLORIDE (5%, hot) C B A A A
MAGNESIUM SULPHATE (hot) A A A A A
METHYL ALCOHOL (65°C) C B A A A
NAPHTHA (20°C) A A A A A
NICKEL CHLORIDE SOLUTION (20°C) A A B B B
NICKEL SULPHATE (hot/cold) A A A A A
NITRIC ACID (50% @ 20°C) A A E E A
(65%, boiling) B B E E D
OIL - CRUDE (hot/cold) A A A A A
OIL – VEG/MINERAL (hot/cold) A A A A A
OXALIC ACID (10%, boiling) D C B A B
PHENOL A A A A A
PHOSPHORIC ACID (10% @ 20°C) C B B B B
PICRIC ACID (70%) A A 0 0 0
POTASSIUM BICHROMATE (20°C) A A A A A
POTASSIUM CHLORIDE (5%, boiling) A A A A A
POTASSIUM HYDROXIDE (50%, boiling) B A A A A
POTASSIUM NITRATE (5%, hot) A A A A A
POTASSIUM SULPHATE (5%, hot) A A A A A
POTASSIUM SULPHIDE (salt) A A A A A
SEA WATER A A A A A
SEWAGE A A A A A
SODIUM CARBONATE (5% @ 65°C) A A A A A
SODIUM CHLORIDE (saturated, boiling) B A A A A
SODIUM HYDROXIDE A A A A A
SODIUM HYPOCHLORITE (5%, still) B A C C C
SODIUM NITRATE (fused) C B A B A
SODIUM SULPHATE (20°C) A A A A A
SULPHUR DIOXIDE (moist, 20°C) B A D C C
SULPHUR (wet) B A B B A
SULPHURIC ACID (10% @ 20°C) C B B A C
(fuming, 20°C) C B C B B
SULPHUROUS ACID (saturated, 190°C) C B E E E
TANNIC ACID (65°C) A A A A A
TRICHLORACETIC ACID (20°C) E E B B B
ZINC CHLORIDE (5%, boiling) B B B B B
ZINC SULPHATE (25%, boiling) A A A A A
 
FILLER & FACING MATERIALS
EXPANDED GRAPHITE: See details for Supagraf® Plain.
HTF (HIGH TEMPERATURE FILLER): When used with suitable winding steel grades, this material resists the majority of common media including: hot oil, fuels, acids, alcohols, and esters. It should NOT be used with: sulphuric, phosphoric, hydrofluoric or other strong mineral acids.
 
PTFE (WITH 25% GLASS FIBRE): This material is chemically inert to most media, with a few exceptions as follows.
• It offers only fair resistance to: ammonium hydroxide, bromine, chromic acid, hydroboric acid, hydrochloric acid, hydrocyanic acid, nitric acid (0-50%), phenol, and sodium hydroxide.
• It should NOT be used with: fluorosilicic acid, hydrofluoric acid, hydrogen sulphide solution, or sodium silicate.
 
Due to the complexity of making a recommendation for any given duty, this section on chemical suitability is intended only as a guide. The possible effect of elevated temperatures should be considered when determining the compatibility of these products with a chemical. If necessary, please contact our technical services team for assistance.