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Nonmailable Articles in International Mail

Hazardous materials - Gases

Please note that laws/provisions prohibit certain articles sent by international mail.

Also, the destination country may also restrict certain articles to be sent.

International Mail Conditions.

Hazardous materials - Gases

  1. Gases with steam pressures exceeding 300 kilopascals (3.0 bars or 43.5 pounds per 1 square inch) at 50 degrees centigrade (122 degrees Fahrenheit)
  2. Materials that transform into gas at 20 degrees centigrade (68 degrees Fahrenheit) and at standard pressure 101.3 kilopascals (1.01 bars or 14.7 pounds per 1 square inch)
  3. Category
    • Substances that are completely in a gaseous state at 20 degrees centigrade (68 degrees Fahrenheit) and standard pressure of 101.3 kilopascals (1.01 bars or 14.7 pounds per 1 square inch)
      • Flammable when 13% air or less in volume is mixed.
      • Flammable range with at least 12% air even if the range is narrow.The flammability must be determined based on a test or calculation compliant with a method adopted by ISO (See ISO standard 10156: 1996).When sufficient data is unavailable for these method, an equivalent test should be conducted based on appropriate method, which is approved by national authority.
      • Examples: Flammable aerosols, acetylene, butane, and hydrogen
    • Nonflammable and nontoxic gases
      • Gases that exhibit pressures not lower than 200 kilopascals at 20 degrees centigrade or that are transported in a state of deep cold liquid. Specifically, they are
        • Gases that normally thin or replace oxygen in blackdamp air
        • Oxidative gases that are generally more likely than air to cause or help other substances to burn when oxygen is supplied.
        • Materials not under the other categories
      • Examples: Fire extinguishers with neon, air, or a compressed gas; carbon dioxide; nitrogen dioxide; and helium
    • Toxic gases
      • Gases that pose a danger to health because they have a toxic effect on the human body or they are corrosive.
      • Gases that are considered to have a toxic effect on the human body or to be corrosive because they exhibit an LC50 value not greater than 5000 milliliters (5000 ppm) when tested based on the criteria for inhalation toxicity.
      • Examples: Sulfuryl fluoride and toxic gas samples

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