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May 19, 2019 · Learn what the different hazardous and safety signs mean, such as the flame symbol, the exclamation mark, and the corrosion symbol. Find out how to identify and handle hazardous materials and chemicals with the Globally Harmonized System of Classification and Labeling of Chemicals.
Dangerous when wet compounds react violently with water to form toxic vapors and/or flammable gases that can ignite and cause a fire. Please note: attempting to put out a fire involving dangerous when wet materials with water will only make the situation worse.
Class 4, Division 4.3 Dangerous When Wet materials are those that, on contact with water, are liable to become spontaneously flammable or exude flammable or toxic gas. Examples: Aluminium phosphide, sodium, and zinc particles.
Flammable solids, spontaneously combustible and dangerous when wet. CLASS 4.1 – Flammable Solids These will burn easily, more so than ordinary combustible materials such as wood and paper.
Blue represents goods that are dangerous when wet — meaning when these materials meet water, they can become flammable. Examples include sodium, calcium and potassium. You’ll see dangerous when wet, an image of a flame and the number 4 on these placards.
In addition to complying with 49 CFR §172.519, the background color on the DANGEROUS WHEN WET placard must be blue. The letters in the words “WHEN WET” must be at least 25 mm (1.0 inches) high. The symbol, text, class number and inner border must be white.
For the purposes of this chapter, dangerous when wet material (Division 4.3) means a material that, by contact with water, is liable to become spontaneously flammable or to give off flammable or toxic gas at a rate greater than 1 L per kilogram of the material, per hour, when tested in accordance with UN Manual of Tests and Criteria.
