The M28 Powder Fire Extinguisher is specifically designed to tackle Class D burning metal fires (excluding lithium).
Class D fires are caused by burning metals that combust easily on contact with air, such as magnesium and lithium. Such specialised fires require a specialised metal powder fire extinguisher to deal with them, and will be required in scientific labs or where manufacturing processes involve the risk of metal fires. For example, aluminium dust or swarf can catch fire, so any process involving cutting, drilling or milling aluminium holds potential risk.
The 8kg M28 Powder Extinguisher is supplied with a low velocity applicator lance which prevents you spreading the burning metal powder or swarf around your lab or workshop, as it slows down the delivery of powder to allow the user to carefully aim where it is needed.