All About Class Four Flammable Solids

Haz Guides Jun 30, 2020

In this guide we'll be covering dangerous goods class three flammable solids a little more in depth.

What is a Class Four?

Class four dangerous goods - flammable solids, are goods that include substances that may spontaneously combust and when in contact with water emit flammable gasses. Examples of class 4 dangerous goods are matches, activated carbon, alkali metals, metal powders, and various others.

Class Four Divisions

Dangerous goods class four flammable solids are broken up into three divisions depending on specific danger of the material.

4.1 These are regular flammable solids that are any type of the following materials:

  1. Desensitized Explosives - Which when dry are explosives in class one, but instead are shipped with sufficient water or other suppressant to suppress explosive properties.
  2. Self reactive materials - Which are materials that are thermally unstable and can undergo a strongly exothermic decomposition (giving off heat).
  3. Generic types - Which are self-reactive materials that range in detonation, heat, violence, and several other properties.
  4. Readily combustible solids - Which are materials that may cause a fire from friction and show a burning rate faster that 2.2mm per second, or any metal powder that can be ignited and have the while sample length react in fewer than 10 minutes.

4.2 These are goods that can spontaneously combust which are materials that are:

  1. A pyrophoric material, which is a solid that even in small quantities can ignite within 5 minutes of coming in contact with air without an external ignition source or,
  2. A self heating metal, which is self-heating when it comes into contact with air.

4.3 Dangerous when wet - These materials are ones that when in contact with water, are able to be spontaneously flammable or to five off flammable toxic gas at a rate of 1 liter per hour or greater.

Class Four Dangerous Good Label

The label for a class four flammable solid differs depending on division. 4.1 is red and white vertically striped, 4.2 is half white and half red, 4.3 is blue.

Class 4 Dangerous Goods Label

Nick Seferos

Sea-going maritime professional on ships and tugs turned to shore-side terminal life. Nick manages shore-side personnel and security, customs, and hazardous shipments in a container terminal.

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