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Frequently Asked Questions

Materials Compatibility Charts

Jun 2, 2020, 15:28 PM
Title : Materials Compatibility Charts

Gas Compatibility

The compatibility data that follows has been compiled to assist in evaluating appropriate materials for use in handling various gases. It is extremely important that all gas control equipment be compatible with the gas being used. The use of a device that is not compatible may damage the unit and cause a leak that could result in property damage or personal injury. To reduce potentially dangerous situations, always check for the compatibility of materials before using any gases in your gas control equipment.

Since combinations of gases are virtually unlimited, mixtures (except for Oxyfume® and Medifume™ sterilizing gas mixtures) are not listed in the Compatibility Chart. Before using a gas mixture or any gas not listed in the chart, we strongly urge you to contact Praxair for information.

Important

This information is for experienced operators who know the general principles and the safety precautions to be observed in handling specialty gases and associated equipment. If you are not certain you fully understand these safety precautions, we urge you to obtain and read the applicable Material Safety Data Sheet (MSDS) and Equipment Instruction Booklet.

The information contained in the Compatibility Chart has been compiled by Praxair from what it believes are authoritative sources and it is offered solely as a convenience to customers. While Praxair believes that this information is accurate and factual as of the date of this publication, this information is intended to be used only as a guide in providing general information with respect to the products mentioned; and, therefore, it is not to be taken as a warranty or representation for which Praxair assumes legal responsibility.

Since the user’s product formulation, specific use application, and conditions of use are all outside Praxair’s control, Praxair makes no warranty or representation regarding the result which may be obtained by the user. It shall be the responsibility of the user to determine the suitability of the user’s gas control.

Directions

To use the compatibility chart on this page, proceed as follows:

  1. Locate the gas you are using in the first column of the chart.
  2. Check the materials of construction you intend to use. Materials of Construction have been grouped by metals, plastics and elastomers.
  3. Refer to the applicable "Key to Materials Compatibility Symbol".
  4. Verify that the "Key to Materials Compatibility Symbol" allows this combination and that the application is satisfactory.

Key to Materials Compatibility

S Satisfactory for use with the intended gas.
C Conditional. May be incompatible under some circumstances or conditions. Contact your Praxair representative for additional information.
U Unsatisfactory for use with the intended gas.
I Insufficient data available to determine compatibility with the intended gas.
O All nonmetalic, even those considered compatible, may be ignitable in oxygen enriched environments or in other oxidizing gases. Successful use depends upon oxygen purity, pressure, temperature, cleanliness and elimination of ignition mechanisms. Please contact your Praxair Representative for additional information.

Metals

Common Name Chemical Formula Brass Carbon Steel Stainless Steel Aluminum Zinc Copper Monel
Acetylene C2H2 C S S S U U S
Air -- S S S S S S S
Ammonia NH3 U S S S U U S
Argon Ar S S S S S S S
Arsine AsH3 S C S C I S S
Boron Trichloride BCl3 U S S U I S S
Boron Trifluoride BF3 S S S C I S S
1,3-Butadiene C4H6 S S S C S S S
Butane C4H10 S S S C S S S
1-Butene C4H8 S S S C S S S
Carbon Dioxide CO2 S S S S S S S
Carbon Monoxide CO S C S C S S S
Chlorine Cl2 U S S U U U S
Deuterium D2 S C S C S S S
Diborane B2H6 S C S C I S S
Dichlorosilane H2SiCl2 S S S U I S S
Disilane Si2H6 S C S C I S S
Ethane C2H6 S S S C S S S
Ethylene C2H4 S S S C S S S
Halocarbon 14 CF4 S S S C I S S
Halocarbon 22 CHClF2 S S S C I S S
Halocarbon 23 CHF3 S S S C I S S
Halocarbon 116 C2F6 S S S C S S S
Halocarbon 134A CH2FCF3 S S S C I S S
Halocarbon 218 C3F8 S S S C I S S
Helium He S S S S S S S
Hydrogen H2SiCl2 S S S S S S S
Hydrogen Bromide HBr U S S U U U S
Hydrogen Chloride HCl U S S U U U S
Hydrogen Sulfide H2SiCl2 U C S C I I S
Isobutane C4H10 S S S C S S S
Isobutylene C4H8 S S S C I S S
Krypton Kr S S S S S S S
Medifume™ Mixture - C S S I I U I
Methane CH4 S S S C S S S
Methyl Chloride CH3Cl S S S U U S S
Neon Ne S S S S S S S
Nitric Oxide NO U S S C I S S
Nitrogen N2 S S S S S S S
Nitrogen Dioxide NO2 U S S C I U S
Nitrogen Trifluoride NF3 C C C U C C C
Nitrous Oxide N2O S S C C S S S
Oxygen O2 S C O C S S S
Oxyfume® Mixture - C S S C I U I
Pentane C5H12 S S S S S S S
Phosphine PH3 S C S C U I S
Propane C3H8 S S S C S S S
Propylene C3H6 S S S C S S S
Silane SiH4 S C S C I S S
Silicon Tetrachloride SiCl4 C S S C I U S
Sulfur Dioxide SO2 C S S C U U S
Sulfur Hexafluoride SF6 S S S S I S S
Trichlorosilane HSiCl3 S S S U I I S
Tungsten Hexafluoride WF6 I C C U U I S
Xenon Xe S S S S S S S

Plastics

Common Name Chemical Formula Kel-F® Teflon® Tefzel® Kynar® PVC Polycarbonate
Acetylene C2H2 S S S S I I
Air -- S S S S S S
Ammonia NH3 S S S U I I
Argon Ar S S S S S S
Arsine AsH3 S S S S S I
Boron Trichloride BCl3 S S S S S I
Boron Trifluoride BF3 S S S S S I
1,3-Butadiene C4H6 S S S S S U
Butane C4H10 S S S S S U
1-Butene C4H8 S S S S S U
Carbon Dioxide CO2 S S S S S U
Carbon Monoxide CO S S S S S S
Chlorine Cl2 S S S S U U
Deuterium D2 S C S S S I
Diborane B2H6 S S S S S I
Dichlorosilane H2SiCl2 S S S S I I
Disilane Si2H6 S S S S S U
Ethane C2H6 S S S S S I
Ethylene C2H4 S S S S I I
Halocarbon 14 CF4 I S I S I I
Halocarbon 22 CHClF2 S C S S U U
Halocarbon 23 CHF3 S S I S I I
Halocarbon 116 C2F6 S S S S U U
Halocarbon 134A CH2FCF3 I I I I I I
Halocarbon 218 C3F8 S S S I I I
Helium He S S S S S S
Hydrogen H2SiCl2 S S S S S S
Hydrogen Bromide HBr I S I S I I
Hydrogen Chloride HCl S S S S S U
Hydrogen Sulfide H2SiCl2 S S S S U S
Isobutane C4H10 S S S S S U
Isobutylene C4H8 S S S S S U
Krypton Kr S S S S S S
Medifume™ Mixture - S S I I U U
Methane CH4 S S S S S I
Methyl Chloride CH3Cl S S S S I I
Neon Ne S S S S S S
Nitric Oxide NO S S S S S S
Nitrogen N2 S S S S S S
Nitrogen Dioxide NO2 S S S U U I
Nitrogen Trifluoride NF3 C C I C I I
Nitrous Oxide N2O O O C O O I
Oxygen O2 O O O O O C
Oxyfume® Mixture - S S I I U U
Pentane C5H12 S S S S S S
Phosphine PH3 S S S S I I
Propane C3H8 S S S S S U
Propylene C3H6 S S S S S U
Silane SiH4 S S S S S I
Silicon Tetrachloride SiCl4 S S I S U I
Sulfur Dioxide SO2 S S S S S I
Sulfur Hexafluoride SF6 S S S S S I
Trichlorosilane HSiCl3 S S I I U I
Tungsten Hexafluoride WF6 I C C C C I
Xenon Xe S S S S S S

Elastomers

Common Name Chemical Formula Kalrez® Viton® Buna-N Neoprene Polyurethane
Acetylene C2H2 S U U U U
Air -- S S S S S
Ammonia NH3 C U C S I
Argon Ar S S S S S
Arsine AsH3 S S S S U
Boron Trichloride BCl3 C S U U I
Boron Trifluoride BF3 C S U U I
1,3-Butadiene C4H6 I S U U U
Butane C4H10 S S S S S
1-Butene C4H8 S S S U S
Carbon Dioxide CO2 S S U U S
Carbon Monoxide CO S S S U S
Chlorine Cl2 S S U U U
Deuterium D2 S S S S S
Diborane B2H6 S I I I I
Dichlorosilane H2SiCl2 I S S S I
Disilane Si2H6 I S I S I
Ethane C2H6 S S S U S
Ethylene C2H4 S S S S I
Halocarbon 14 CF4 I S S S I
Halocarbon 22 CHClF2 C U U C U
Halocarbon 23 CHF3 I S I I I
Halocarbon 116 C2F6 C S S S S
Halocarbon 134A CH2FCF3 I I U U I
Halocarbon 218 C3F8 I S S S I
Helium He S S S S S
Hydrogen H2SiCl2 S S S S S
Hydrogen Bromide HBr I U U U I
Hydrogen Chloride HCl S U U U U
Hydrogen Sulfide H2SiCl2 S U U U S
Isobutane C4H10 S S S S S
Isobutylene C4H8 S S S U I
Krypton Kr S S S S S
Medifume™ Mixture - C S S S S
Methane CH4 S S S S S
Methyl Chloride CH3Cl S S U U U
Neon Ne S S S S S
Nitric Oxide NO S S U U I
Nitrogen N2 S S S S S
Nitrogen Dioxide NO2 C U U U U
Nitrogen Trifluoride NF3 I I I I I
Nitrous Oxide N2O C O U U U
Oxygen O2 O U O O O
Oxyfume® Mixture - C U U U U
Pentane C5H12 S S
Phosphine PH3 U S S S S
Propane C3H8 I S S U I
Propylene C3H6 S S U U U
Silane SiH4 I S S S I
Silicon Tetrachloride SiCl4 C S U U I
Sulfur Dioxide SO2 S U U U S
Sulfur Hexafluoride SF6 C S S S S
Trichlorosilane HSiCl3 C S U U I
Tungsten Hexafluoride WF6 I I U U I
Xenon Xe S S S S S

Note: These charts have been prepared for use with dry (anhydrous) gases at normal operating temperature of 70 °F (21 °C). Information may vary if different operating conditions exist. Systems and equipment used in oxidizer gas service (e.g., Oxygen or Nitrous Oxide) must be cleaned for oxygen service.

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