Disclaimer:
The information provided in this article is intended for general reference only. Users should ultimately make product selections for their applications based on their judgment of the materials, chemical substances, and corrosion factors involved. This article does not provide any form of warranty, expressed or implied.

In no event shall SJ Gauge, its distributors, and suppliers be liable for any damages arising from the use or inability to use this article, including but not limited to consequential damages, personal injury/negligence resulting in death, loss of profits, or business interruption. Such damages are disclaimed, whether advised of the possibility of such damages or not.

The careless use of this article may lead to accidents that endanger life and property. Most factories or corporations have chemical or corrosion-related material engineers who are better equipped to accurately specify instrument materials as they should be familiar with detailed information as well as experienced in their applications and usage.

This article is intended as a reference for users when they do not have access to such resources or other information sources. For any further questions, please consult customer service or a related professional expert to inquire about chemicals or conditions not covered in this article.

SJ Gauge: Pressure gauges or diaphragm pressure gauges, due to their measurement mechanics, have connectors that come into contact with the pressure source (medium). For fluids with corrosive properties, we often opt for pressure gauges with plastic connectors or diaphragms. The following list outlines the corrosion resistance of common plastic materials used in pressure gauges with different pressure sources (information is for reference only; actual conditions may vary, and on-site experience should be the primary consideration):

Stainless Steel 316/316L

Advantages:

  • Ultra-low carbon 316L stainless steel minimizes harmful carbide precipitation caused by welding.
  • Better corrosion resistance compared to 304 stainless steel.
  • Excellent pitting corrosion resistance, good resistance to most chemicals in the paper, textile and photography industries.
  • Good corrosion resistance in chloride environments, seawater and chemical environments (such as sulfur compounds, phosphoric acid and formic acid, as well as other organic acids).
  • Good resistance to neutral and alkaline salts (including strong oxidizing salts).

Disadvantages:

  • May corrode and crack in chloride solutions under internal/external stress.
  • Susceptible to corrosion by non-oxidizing acids (most concentrations of sulfuric acid and hydrochloric acid).
  • Prone to corrosion and cracking in warm chloride environments, especially above 60°C (140°F).

Hastelloy C

Advantages:

  • Excellent resistance to seawater corrosion.
  • Outstanding corrosion resistance in seawater and chloride salt environments.
  • Applicable to various inorganic and organic chemical processes.
  • Resistant to moist chlorine and concentrated chlorine salt solutions.
  • Good resistance to various non-oxidizing media (sulfuric acid, phosphoric acid and acetic acid).
  • Good resistance to mixed oxidizing acids (nitric acid/sulfuric acid, chromium/sulfuric acid, sulfuric acid/copper sulfate, chromic acid and high manganese acid salts).

Disadvantages:

  • Susceptible to hydrogen embrittlement.
  • Hydrogen permeation can be mitigated with a gold coating.

Monel Alloy, Nickel-Copper Alloy Series (Commonly used in instrumentation - Monel 400)

Advantages:

  • Resistant to various reducing media (fluorine, hydrofluoric acid, sulfuric acid, hydrogen fluoride and derivatives).
  • Excellent resistance to seawater.

Disadvantages:

  • Not recommended for use in caustic alkali evaporators and concentrators.
  • Susceptible to hydrogen embrittlement.
  • Hydrogen permeation can be mitigated with a gold coating.

Tantalum

Advantages:

  • Excellent corrosion resistance to most acids (hydrochloric acid, nitric acid, phosphoric acid, sulfuric acid and acidic ferric chloride solutions), saltwater solutions and organic chemicals.

Disadvantages:

  • Susceptible to corrosion by sulfur trioxide, hydrofluoric acid and strong alkaline solutions.
  • Embrittlement may occur in the presence of hydrogen gas, high-temperature oxygen or nitrogen gas.

O = This means the material is OK for the service. The uniform corrosion rate is less than 0.002 per year and there is no tendency for pitting or stress corrosion. This material may use a Bourdon tube, bellows, diaphragm, or lower housing.

L = Indicates the uniform corrosion rate is less than .020 inches per year and the material is suitable only for a diaphragm seal lower housing. It is NOT suitable for a Bourdon tube, bellows, or diaphragm.

X = This material is not recommended, insufficient information or complex restrictions cannot be addressed in this table. 
 

 

 

 

 

Material

Corrodent

Common Names & Formulas

Corrodent Temp. ºF MAX

Concentration % in H2O

316, 316L SS

Monel

Nickel

Hastelloy C276

Tantalum

ACETIC ACID

 

200

<40

O

X

X

O

O

ACETIC ANHYDRIDE

 

200

–

X

X

X

O

O

ACETONE

 

150

–

O

O

O

O

O

ACETYLENE, DRY

 

200

100

O

X

O

O

O

ACROLEIN

 

200

100

L

L

L

L

O

ALUMINUM CHLORIDE

AlCl3, Polyaluminum Chloride

150

–

X

X

X

O

X

ALUMINUM SULFATE

Alum. Al2(SO4)3

150

<50

L

X

X

O

O

AMMONIA ANHYDROUS

DOT Quality NH3

300

100

O

X

X

L

X

AMMONIUM CHLORIDE

Sal Ammoniac NH4Cl

200

<40

X

X

X

O

O

AMMONIUM HYDROXIDE

Ammonia Water

NH3 in Water

120

<30

O

X

X

L

X

AMMONIUM NITRATE

Norway Saltpeter NH4NO3

200

<50

O

X

X

L

O

AMMONIUM SULFATE

(NH4)2SO4

200

<60

L

X

L

L

O

AMYL ACETATE

 

250

–

O

X

X

O

O

ANILINE

 

200

>99

O

L

L

X

O

BEER

 

200

–

O

X

X

X

X

BENZENE

C6H6

200

<50

O

O

O

X

O

BENZIDINE

 

200

<99

L

L

L

L

O

BENZOIC ACID

 

200

<70

L

L

L

O

O

BLACK LIQUOR

Sulfate Liquor

200

–

X

X

X

X

X

BLEACH

<5% NaOCl

120

<5

X

X

X

O

O

BORIC ACID

H3BO4

150

<25

O

L

L

O

O

BROMINE, DRY

(<57 PPM H2O)

Br

140

>99

X

L

L

L

O

BROMOBENZENE

 

200

>99

O

L

L

O

O

BUTADIENE (BUTYLENE)

 

200

>99

O

O

O

O

O

BUTANE

C4H10

200

–

O

O

O

O

O

BUTYL ALCOHOL

Butanol

200

–

O

O

O

O

O

BUTYRIC ACID

 

200

<10

L

X

X

O

O

CALCIUM BISULFATE

Ca(HSO3)2

250

>90

O

X

X

X

X

CALCIUM CHLORIDE

CaCl2

200

<80

X

X

X

O

O

CALCIUM HYDROXIDE

Slaked Lime Ca(OH)2

200

<50

L

X

X

O

O

CALCIUM HYPOCHLORITE

Ca(OCl)2

75<

<10

X

X

X

L

O

CARBON DIOXIDE, WET

CO2

150

>50

ppm

O

O

X

O

O

CARBON MONOXIDE

CO

200

>99

O

O

X

O

O

CHLORINATED WATER

(<10ppm Chlorine)

 

70

<10

ppm

O

O

X

O

O

CHLORINATED WATER

(To Saturation)

 

120

–

X

X

X

O

O

CHLORINE, DRY (<50PPM H2O)

Cl2

200

>99

X

X

L

L

O

CHLORINE, MOIST

 

160

>90

X

X

X

L

O

CHLOROACETIC ACID

 

150

<30

X

L

X

L

O

CHLOROFORM, DRY

Trichloromethane CHCl3

100

>99

O

O

O

X

O

CHROMIC ACID

Chromium Trioxide H2CrO4"

200

<30

X

X

X

X

O

CITRIC ACID

 

200

>10

<50

O

L

L

O

O

COPPER NITRATE

Cupric Nitrate Cu(NO3)2

200

<10

O

X

X

X

O

COPPER SULFATE

Cupric Sulfate CuSO4

200

<30

L

X

X

O

O

CREOSOTE

Coal-Tar

200

–

L

L

L

O

O

CRESOL

 

200

>99

O

O

O

O

O

CRUDE OIL - SOUR

 

<200

<5

X

O

X

O

O

CRUDE OIL - SWEET, LOW SULFUR

 

200

–

O

O

O

O

O

CUPRIC CHLORIDE

Copper Chloride

200

<40

X

X

X

X

O

DIESEL FUEL

 

140

–

O

O

O

O

O

DOWTHERM A

 

300

–

O

O

O

O

O

ETHANOL

Ethyl Alcohol C2H5OH

200

–

O

O

O

O

O

ETHANOL AMINES

MEA, DEA, TEA

120

100

O

O

L

O

O

ETHYL ACETATE

 

<200

–

O

O

O

O

O

ETHYL CHLORIDE, DRY

Chloroethane

<200

>99

X

O

O

O

O

ETHYLENE

Ethene

200

–

O

O

X

O

O

ETHYLENE GLYCOL

Glycol

200

>40

O

L

L

O

O

ETHYLENE OXIDE

ETO

100

>99

O

O

O

X

O

FERRIC CHLORIDE

FeCl3

200

<40

X

X

X

X

O

FERRIC SULFATE

Fe2(SO4)3

150

<10

O

X

X

O

O

FERROUS CHLORIDE

FeCl2

200

<30

X

X

X

L

O

FERROUS SULFATE

FeSO4

200

<50

X

X

X

L

O

FLUORINE, GAS DRY

No Air or O2

F2

200

>99

X

O

O

X

X

FLUOROSILICIC ACID

Hydrofluosilicic Acid - H2SiF6

140

<30

X

X

X

X

X

FORMALDEHYDE

 

200

–

O

O

O

X

O

FORMIC ACID

 

<150

–

X

X

X

L

O

FUEL OIL, LIGHT

Diesel, No. 2, Heating Oil

140

–

O

O

O

O

O

FUEL OIL, HEAVY

Bunker, Resid, No. 6, Heavy Gas Oil

300

–

L

X

X

O

O

FURFURAL

 

200

<10

X

L

L

O

O

GASOLINE

*FLOWING-PHOS BRONZE

 

200

–

O

X

X

O

O

GLUCOSE

 

300

–

O

O

O

O

O

GLYCERIN

Glycerol

200

–

O

O

O

O

O

HEXANE, DRY

 

200

>99

O

O

O

O

O

HYDRAZINE

 

100

–

X

X

X

X

X

HYDROBROMIC ACID

HBr

140

–

X

X

X

X

O

HYDROCHLORIC ACID

HCl,

Muriatic Acid

100

<38

X

X

X

X

O

HYDROFLUORIC ACID (NO AIR)

HF

120

<50

X

X

X

X

X

HYDROFLUOSILIC ACID

Fluosilicic Acid

140

<30

X

X

X

X

X

HYDROGEN

H2

200

–

O

X

X

X

X

HYDROGEN PEROXIDE

H2O2

100

<30

O

X

X

X

O

HYDROGEN SULFIDE

H2S

140

–

X

X

X

O

O

KEROSENE

Kerosine

200

>99

O

O

O

O

O

LACTIC ACID

 

<100

<70

O

X

X

L

O

MAGNESIUM CHLORIDE

MgCl2

200

<40

X

X

X

O

O

MAGNESIUM SULFATE

Epsom Salts MgSO4

200

<40

O

O

O

X

O

MERCURIC CHLORIDE

HgCl2

200

<60

X

X

X

X

O

MERCURY

Quicksilver Hg

200

>99

O

X

O

O

X

METHANE DRY, NO H2S

CH4

200

–

O

O

O

O

O

METHANOL

Wood Alcohol

100

>99

O

O

O

O

O

METHYL ETHYL KETONE

M.E.K.

120

>99

O

X

X

X

X

MILK

 

–

–

O

X

X

O

X

MORPHOLINE

 

200

>99

O

O

O

O

X

NAPHTHA

Benzin

200

>99

O

O

O

O

O

NAPHTHALENE

Tar Camphor C10H8

150

>99

O

O

O

X

L

NATURAL GAS, DOT QUALITY

*Cu alloy <100PSI

 

150

–

O

L

X

O

O

NICKEL CHLORIDE

NiCl2

200

<80

X

X

X

O

O

NICKEL SULFATE

NiSO4

200

–

O

X

X

X

X

NITRIC ACID

HNO3

<100

<95

O

X

X

X

O

NITROUS OXIDE (DRY)

Laughing Gas N2O

<100

>99

L

X

X

L

O

N-METHYLPYRROLIDONE

NMP

70

>99

L

X

O

O

X

OLEIC ACID

 

200

–

L

L

L

L

O

OXALIC ACID

 

140

<50

X

X

X

L

O

OXYGEN GAS ("X6B")

O2

120

–

O

O

X

O

O

OZONE

O3

120

<8

O

X

X

X

X

PALMITIC ACID

 

160

>99

O

X

X

O

X

PHENOL

 

120

>90

O

L

O

O

O

PHOSPHORIC ACID

H3PO4

100

<60

O

X

X

O

O

PHTHALIC ANHYDRIDE

 

200

>99

O

O

O

O

O

PICRIC ACID

 

200

<10

O

X

X

L

O

POTASSIUM CHLORIDE

KCl

150

<30

X

L

L

O

O

POTASSIUM HYDROXIDE

KOH

160

<50

L

O

O

L

X

POTASSIUM NITRATE

Saltpeter KNO3

200

<50

L

L

L

L

O

POTASSIUM NITRITE

KNO2

200

<50

L

L

L

L

X

POTASSIUM PERMANGANATE M

KMnO4

140

<30

X

X

X

X

O

PROPANE

C3H8

200

>99

O

O

O

O

O

PROPYLENE

 

200

>99

O

O

O

O

O

ROSIN

 

200

–

O

O

O

O

X

SEA WATER

*Monel not for Diaphragms

Ocean Water

200

–

X

O*

X

O

O

SEWAGE, RAW

 

100

–

L

L

X

O

O

SILICONE OIL

PDMS

140

–

O

O

O

O

O

SILVER NITRATE

(Acid free)

AgNO3

200

<50

L

X

X

X

O

SKYDROL

 

200

100

O

O

O

O

O

SODIUM BICARBONATE

Baking Soda NaHCO3

<200

<20

O

O

O

L

X

SODIUM BISULFATE

NaHSO4

<200

<30

X

L

L

L

O

SODIUM BISULFITE

NaHSO3

<150

<40

X

L

X

L

O

SODIUM CARBONATE

Soda Ash Na2CO3

<200

<40

O

O

O

O

O

SODIUM CHLORIDE

Table Salt NaCl

<200

<30

X

O

L

O

O

SODIUM CHROMATE

Na2CrO4

<200

<60

O

O

O

O

O

SODIUM CYANIDE

NaCN

<140

–

O

X

X

X

O

SODIUM DICHROMATE

S. Bichromate Na2Cr2O7

<140

<20

O

X

X

X

X

SODIUM HYDROXIDE

Caustic Soda NaOH

<150

<40

O

O

O

O

X

SODIUM HYDROXIDE

Caustic Soda NaOH

<200

<70

X

O

O

L

X

SODIUM HYPOCHLORITE

NaOCl, Bleach

120

<40

X

X

X

X

O

SODIUM NITRATE

Chile Saltpeter NaNO3

<200

–

O

X

O

X

O

SODIUM NITRITE

NaNO2

<200

<60

O

O

O

O

O

SODIUM PERMANGANATE

(pH >6, no chlorides)

NaMnO4

<120

<50

O

X

O

O

O

SODIUM PEROXIDE

Na2O2

<200

<10

O

L

L

L

X

SODIUM PHOSPHATE (TRIBASIC)

TSP Na3PO4

<200

<60

O

O

O

O

O

SODIUM SILICATE

Water Glass

<200

–

O

O

O

L

O

SODIUM SULFATE

Na2SO4

<200

<30

O

L

L

L

O

SODIUM SULFIDE

Na2S

<200

<30

L

L

L

L

O

SODIUM SULFITE

Na2SO3

<200

<30

O

X

X

O

O

SODIUM THIOSULFATE

Na2S2O3

<200

–

O

O

L

L

O

SOUR GAS / OIL

 

<200

<5

X

O

X

O

O

STANNOUS CHLORIDE

Tin Dichloride SnCl2

<200

<50

X

X

X

X

O

STEAM

(WITH SIPHON)

 

<300

–

O

O

O

O

O

STEARIC ACID

 

<200

–

O

X

O

O

O

STODDARD SOLVENT

 

<150

–

O

O

O

O

O

SULFAMIC ACID

 

<150

<95

X

X

X

L

O

SULFUR

S

250

>95

X

X

X

O

O

SULFUR DIOXIDE, WET

SO2

140

–

L

X

X

L

O

SULFUR HEXAFLUORIDE

SF6

120

–

O

O

O

O

O

SULFUR TRIOXIDE, DRY

SO3

140

>99

L

X

L

O

X

SULFURIC ACID

<60%

H2SO4

200

<60

X

X

X

X

O

SULFURIC ACID 80-98%

H2SO4

200

<98

X

X

X

X

O

TANNIC ACID

Tannin

<150

–

O

O

X

X

O

TARTARIC ACID

 

<150

<50

O

O

X

X

O

TOLUENE

Toluol

<200

>99

O

O

O

O

O

TRICHLOROACETIC ACID

 

<200

<50

X

L

X

O

X

TRICHLOROETHANE 1,1,1, DRY

 

<150

>98

O

O

O

O

O

TRICHLOROETHYLENE, DRY

 

<200

>99

O

O

O

O

O

TURPENTINE

 

<200

>98

O

O

O

O

O

UREA

Carbamide, DEF

<200

<50

O

X

X

X

X

VINYL CHLORIDE