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Gas Material Compatibility Guide: Acetylene - Halocarbon

The compatibility data shown on this web site has been compiled to assist in evaluating the appropriate materials to use in handling various gases. Prepared for use with dry (anhydrous) gases at normal operating temperature of 70°F (21°C), information may vary if different operating conditions exist.

It is extremely important that all gas control equipment be compatible with the gas being passed through it. The use of a device that is not compatible with the service gas could damage the unit and cause a leak that could result in property damage or personal injury. To reduce potentially dangerous situations, always check for compatibility of materials before using any gases in your gas control equipment. Systems and equipment used in oxidizer gas service (i.e. oxygen or nitrous oxide) must be cleaned for oxidizer service. Since combinations of gases are virtually unlimited, mixtures (except for ethylene oxide/halocarbon and ethylene oxide/carbon dioxide sterilizing gas mixtures) are not listed in the Compatibility Chart. Before using a gas mixture or any gas not listed in the chart, please contact your Scott Representative for more information.


  1. Locate the gas you using in the first column.
  2. Compare the materials of construction for the equipment you intend to use with the materials of construction shown in the chart. Then use the key below to determine compatibility.

Key to Materials Compatibility
Satisfactory for use with the intended gas.
Unsatisfactory for use with the intended gas.
Insufficient data available to determine compatibility with the intended gas.
Satisfactory with brass having a low (65–70% maximum) copper content. Brass with higher copper content is unacceptable.
Satisfactory with acetylene, however, cylinder is packaged dissolved in a solvent (generally acetone) which may be incompatible with these elastomers.
Compatibility varies depending on specific Kalrez® compound used. Consult E.I. DuPont for information on specific applications.
Satisfactory with brass, except where acetylene or acetylides are present.
Generally unsatisfactory, except where specific use conditions have proven acceptable.
Satisfactory below 1000 psig (68.9 bar).
Satisfactory below 3000 psig (206.9 bar) where gas velocities do not exceed 30 ft./sec.
Compatibility depends on condition of use.
Satisfactory for use with EPR (Ethylene Propylene Rubber) and EPDM.

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