Nonmailable Articles in International Mail Hazardous materials - Flammable solids, pyrophoric materials, materials that generate flammable gas upon contact with water |
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Hazardous materials - Flammable solids, pyrophoric materials, materials that generate flammable gas upon contact with water
- Flammable solid materials, autoreactive substances and similar materials, and stabilized explosive materials
- Flammable solid materials are substances that may easily burn, or may easily burn or produce flames through friction depending on the transport conditions.Easy-to-burn solid materials are powdery/particulate substances or pastes that easily ignite or rapidly spread flame when they are contacted with ignition source such as a match for short time.Other than causing fire, thre is another risk to be caused by burning toxic materials.Metallic powder is especially hazarous since the normal extinguishants such as carbon dioxide and water may increase the risk, and the fire is hard to be extinguished.
- Autoreactive substances and similar materials that are unstable in temperature and likely to induce a decomposition reaction, even without oxygen (air), attended with strong heat.The following substances are not regarded as autoreactive substances defined of 4(1):
- Explosive substances pursuant to the requirements in 1
- Oxidative substances pursuant to the specified procedure for oxidative solid materials
- Organic peroxidic substances pursuant to the requirements in 5 (2)
- Substances with decomposition heat less than 300 joules per gram
- Substances with auto-accelerative decomposition heat that exceeds 75 degrees centigrade per 50-kilogram packet
- Any substance with autoreactivity must be categorized in the above group, pursuant to the requirements for categorizing spontaneous heat generating substances, even if the test shows a result applicable to 4 (2).
- Similar materials are distinguished from autoreactive substances in that they exhibit auto-accelerative decomposition temperatures more than 75 degrees centigrade.The similar materials are likely to decompose attended with strong heat generation as autoreactive substances.Also under the certain packaging condition, it is easy to meet the standard of 1.
- Stabilized explosive materials: substances moistened with water or alcohol or thinned with a different substance in order to suppress the explosiveness
- Examples: safety matches, nitrocellulose films and other products, metal magnesium and magnesium alloys, celluloid, and borneol
- Pyrophoric materials
- Substances that are likely to spontaneously ignite under normal transport conditions or generate heat and ignite when in contact with air
- Examples: dry titanium powders, dry zirconium, anhydrous sodium sulfide
- Materials that generate flammable gas upon contact with water
- Substances that generate flammable gas when in contact with water (substances that are dangerous when wet).Substances that are likely to spontaneously ignite or generate a dangerous amount of flammable gas through the interaction with water.
- These substances are referred to as substances that react with water.
- Examples: zinc ashes, sodium hydroxide, sodium, rubidium, potassium, stabilized maneb, and lithium
