Corrosion resistance

Graphite is corrosion-resistant against most common acids (e.g. hydrochloric acid, sulfuric acid, and hydrofluoric acid) and solvents. It has limited resistance against oxidizing media (e.g. nitric acid) and bases (e.g. amines, potash and caustic soda).

Some small polar aprotic solvents such as tetrahydrofuran (THF), dimethylformamide (DMF), and dimethyl sulfoxide (DMSO) have a tendency to penetrate inside of the phenolic resin and make it swell. Although it does not affect the material's corrosion resistance, it might affect the mechanical strength of the impervious graphite.

Hereunder is a corrosion table that applies to our GAB Neumann’s GPX 1, GPX 1T, and GPX 2 impervious graphite grades. It shows the compatibility of GPX material with certain media. The proper selection of a specific material grade depends on the process conditions. These pieces of information are valid for pure chemicals only. Please do not hesitate to contact us for specific cases involving other chemicals or mixtures of chemicals.

Corrosion table for GAB GPX1, GPX1T, and GPX2

Chemicals Concentration Temperature (°C) / (°F) Resistance
Acetaldehyde Any 200 / 392 Full
Acetates (all common metals) Any 200 / 392 Full
Acetic acid Any 200 / 392 Full
Acetic acid ester Any 200 / 392 Full
Acetic acide anhydride Any 200 / 392 Full
Aceto nitrile Any 200 / 392 Full
Acetone Any 200 / 392 Full
Aldehyde Any 200 / 392 Full
Aliphatic hydrocarbons Any 200 / 392 Full
Alkoholes Any 200 / 392 Full
Amido sulfonic acid 20 100 / 212 Full
Amino acids Any 200 / 392 Full
Ammonia Any 200 / 392 Full
Ammonia carbonate Saturated 200 / 392 Full
Amyl chloride Any 200 / 392 Full
Aniline Any 200 / 392 Full
Aniline hydrochloride Any 200 / 392 Full
Aqua regia Any   Poor
Arsenic acid Any 200 / 392 Full
Benzaldehyde Any 200 / 392 Full
Benzene Any 200 / 392 Full
Benzenesulfonic acid Any 200 / 392 Full
Benzoic acid Any 200 / 392 Full
Benzyle chloride Any 150 / 302 Full
Boric acid Any 200 / 392 Full
Bromine (Br2) Any   Poor
Butanol Any 200 / 392 Full
Butyric acid Any 200 / 392 Full
Calcium bisulfite solution (pulp digesting liquor) 50 200 / 392 Full
Calcium hypochlorite Any ≤ 50 / 122 Full
Carbon bisulfide Any 200 / 392 Full
Carbon dioxide Any 200 / 392 Full
Carbon monoxide Any 200 / 392 Full
Carbon tetrachloride Any 200 / 392 Full
Carboxylic acids Any 200 / 392 Full
Chloral Any 200 / 392 Full
Chlorides of all common metals Any 200 / 392 Full
Chlorine gas, dry Any ≤ 50 / 122 Full
Chlorine gas, moist Any ≤ 50 / 122 Limited
Chlorine gas, moist, with HCl   100 / 212 Full
Chlorine liquid     Poor
Chloroacetic acid (mono-, di, tri-) Any 200 / 392 Full
Chlorobenzene Any 200 / 392 Full
Chlorocyan (cynogen chloride) Any 200 / 392 Full
Chloroform Any 200 / 392 Full
Chlorosulfonic acid 20 ≤20 / 70 Limited
Chlorosulfonic acid > 20   Poor
Chromic acid < 10 ≤ 20 / 70 Full
Chromic acid < 20 ≤ 20 / 70 Limited
Cresols Any 200 / 392 Full
Cyanide galvanising baths Any 200 / 392 Full
Cyclohexane Any 200 / 392 Full
Dibromoethane Any 200 / 392 Full
Dichlorobenze Any 200 / 392 Full
Dichloroethane Any 200 / 392 Full
Dichloroethylene Any 200 / 392 Full
Dimethylacetamide Any 200 / 392 Full
Dimethylaniline Any 200 / 392 Full
Dimethylformamide Any ≤ 60 / 140 Full
Dimethylsulfoxide Any ≤ 60 / 140 Full
Dinitrobenzene Any 200 / 392 Full
Dioxane Any ≤ 60 / 140 Full
Esters Any 200 / 392 Full
Ethanol Any 200 / 392 Full
Ethers Any 200 / 392 Full
Ethyl chloride Any 200 / 392 Full
Fluoboric acid Any 200 / 392 Full
Fluorides Any 200 / 392 Full
Fluorine gas Any   Poor
Formaldehyd Any 200 / 392 Full
Formic acid Any 200 / 392 Full
Glycerine Any 200 / 392 Full
Glycol Any 200 / 392 Full
Heat transfer fluids (Dowtherm, Diphyl, Marlotherm, Syltherm, all types) Any 200 / 392 Full
Hydrobromic acid Any 200 / 392 Full
Hydrochloric acid Any 200 / 392 Full
Hydrofluoboric acid Any 200 / 392 Full
Hydrofluoric acid < 50 160 / 320 Full
Hydrofluoric acid < 60 ≤ 50 / 122 Full
Hydrofluosilicic acid Any 200 / 392 Full
Hydrogen Any 200 / 392 Full
Hydrogen bromide gas Any 200 / 392 Full
Hydrogen chloride gas Any 200 / 392 Full 
Hydrogen fluoride gas, dry Any 100 / 212 Full
Hydrogen peroxide < 5 ≤ 50 / 122 Limited
Hydrogen peroxide > 5   Poor
Hydrogen sulfide Any 200 / 392 Full
Javel water Any   Poor
Ketones Any 200 / 392 Full
Lacitic acid Any 200 / 392 Full
Methanol Any 200 / 392 Full
Methylchloroform Any 200 / 392 Full
Methylene chloride Any 200 / 392 Full
Methylethylketone Any 200 / 392 Full
Methylisobuthylketone Any 200 / 392 Full
Monochloroacetic acid Any 200 / 392 Full
Nitraniline Any 100 / 212 Full
Nitrates of all common metals Any 200 / 392 Full
Nitric acid < 20 ≤ 30 / 86 Full
Nitric acid < 20   Poor
Nitrites of all common metals Any 200 / 392 Full
Nitrobenzene Any 200 / 392 Full
Nitrophenol Any 100 / 212 Full
Nitrotoluene Any 200 / 392 Full
Nitrous gases, dry < 20 ≤ 60 / 140 Full
Nitrous gases, moist < 20 ≤ 60 / 140 Limited
n-Methylopyrolidone Any ≤ 60 / 140 Full
Oleum  Any   Poor
Perchlorethylene Any 200 / 392 Full
Perchloric acid Any ≤ 100 / 212 Full
Phenol Any 200 / 392 Full
Phosgene Any 200 / 392 Full
Phosphoric acid Any 200 / 392 Full
Phosphorusoxichloride Any 200 / 392 Full
Phosphorustrichloride Any 200 / 392 Full
Photographic solutions Any 200 / 392 Full
Pickling baths (HCl + H2SO4) Any 200 / 392 Full
Plating baths Any 200 / 392 Full
Potassium hydroxide < 10 ≤ 60 /140 Full
Potassium hydroxide < 30 ≤ 20 / 70 Full
Potassium hypochlorite Any ≤ 30 / 90 Limited
Potassium permanganate Any 200 / 392 Full
Propanol Any 200 / 392 Full
Pyridine Any 200 / 392 Full
Sea water Any 200 / 392 Full
Sodium carbonate Any ≤ 100 / 212 Full
Sodium chlorate Any 200 / 392 Full
Sodium hydroxide < 10 ≤ 60 / 140 Full
Sodium hydroxide > 10 & < 20 60 - 20 / 140 - 70 Limited
Sodium hydroxide > 20   Poor
Sodium hypochlorite Any ≤ 40 / 104 Limited
Sodium hypochlorite Any > 40 / 104 Poor
Sodium thiosulfate Any 200 / 392 Full
Spinning bath solutions (H2SO4) 50 200 / 392 Full
Sulfates of all commom metals Any 200 / 392 Full
Sulfites of all commom metals Any 200 / 392 Full
Sulfur dioxide, gas 50 200 / 392 Full
Sulfuric acid < 80 200 / 392 Full
sulfuric acid 80 - 95 200 / 392 - 30 / 212 - 90 Full
Sulfuric acid > 95   Poor
Sulfuric acid + sulfurous acid Any 200 / 392 Full
Sulfuryl chloride Any 200 / 392 Full
Tetrachloroethane Any 120 / 248 Full
Tetrachloroethylenen Any 200 / 392 Full
Tetrahydrofurane Any ≤ 60 / 140 Full
Thionyl chloride Any 200 / 392 Full
Toluene Any 200 / 392 Full
Trichloroethylene Any 200 / 392 Full
Uric acid Any 200 / 392 Full
Vinyl chloride Any 200 / 392 Full
Water (including distilled water) Any 200 / 392 Full
Water, vapour Any 200 / 392 Full
Xylene Any 200 / 392 Full

GAB Neumann GmbH | Alemannenstrasse 29 | D-79689 Maulburg | Phone +49 (7622) 6751 0 | Fax +49 (7622) 6751 20 | E-Mail info@gab-neumann.de | www.gab-neumann.com

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