D Class Fire Extinguishers

Class D fires are those involving burning metals. This type of fire can be found anywhere there are metal “fines,” filings or particles including metal fabrication facilities, warehouses, labs, and factories. Not all metals are flammable, but those that are can be very difficult to extinguish once they start to burn.

Most often, these fires involve magnesium and titanium, but they can also involve:

  • Sodium
  • Potassium
  • Sodium-potassium alloys
  • Plastics
  • Zirconium
  • Lithium

To put out combustible metal fires, a Class D extinguisher is the only recommended option. When used properly to extinguish a metal fire, the agent in a D-rated fire extinguisher will form a crust over top of the fire to absorb the heat and smother the fire robbing it of oxygen and preventing it from spreading. We offer 30-LB D Class fire extinguishers from Amerex with an operating temperature range from -40°F to 120°F with a six-year warranty. Extra care and consideration need to be taken when dealing with metal fires. If you choose the wrong extinguishing option, it can quickly make the fire much worse. It’s also important to remember that different metals may require different extinguishing agents. Additionally, these Class D fire extinguishers should not be confused with dry chemical (multi-purpose) fire extinguishers. We can help you choose the right fire extinguisher for your needs. If you can’t find what you’re looking for, call us and ask for our Order Desk today and we’ll help you get started!



Our shipping options for in-stock Class D fire extinguishers allow for same day shipping as long as the order is placed before 12:00 PM EST. If you order a non-stock product, you may need to order the minimum purchase amount set by the product manufacturer. We offer two delivery options from our facility: Dock-to-Dock and Dock-to-Door. Dock-to-Door offers further delivery options that make it easy to receive products at your address, including Tailgate Required, Appointment Required, and Inside Delivery Required. If you have any questions about your order or tracking, please reach out to us at info@herbertwilliams.com , and be sure to include your order number.

The price range for Class D fire extinguishers is higher than most other extinguisher types, due to their specific use and the unique suppression agent used. Class D extinguishers are designed for extinguish burning metals, which can be extremely difficult to suppress once they are ignited.

The most common types of metal fires typically involve titanium and/or magnesium, as well as Lithium, Zirconium, Sodium, and Potassium. The most common area for a Class D fire to start is in manufacturing where there are lots of metal shavings, filings, or particles.

Class D fires cannot be extinguished with water; water will interact with the combustible metal and create a more intense fire while spreading the molten metal.

Class D metals are difficult to extinguish because they burn at such high temperatures, and are volatile when coming in contact with water or air. Only a Class D suppression agent will extinguish the fire successfully by smothering it and cooling the material.

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