US Fire Testing Class K


What is a Class K fire?

Fire class is a term used to denote the type of fire in relation to the combustion material which has ignited. A Class K fire is described as flammable oils found in cooking such as oils, fats, frying oils etc.

All Firexo Fire Class ratings have been achieved through the EN fire tests.

US Fire Testing Class K
US Fire Testing Class K

A Class K fire in the U.S. is considered a Class F fire in Europe. For this reason, detailed below is the EN fire test explanation of a Class F fire:

When testing an extinguisher against Class F guidelines, there are 5 different sizes of fire that can be attempted. These different difficulty levels are set up to distinguish what size of fire the extinguisher can handle. These levels are as follows; 3F, 5F, 25F, 40F, and 75F.

The number of the fire test is the total amount of oil used, so a 3F fire is 3 liters, whilst a 75F fire is 75 liters.

When an extinguisher is subjected to a Class F fire test, it must extinguish a tray of vegetable oil that has been heated to self-ignite.
The size of the oil increases as the fire rating increases to allow for the additional oil.

Once the oil has self-ignited, it is allowed to burn for 2 minutes. Then the fire fighter is sent into the fire with a single extinguisher and must extinguish the fire in one continuous action.
In order to pass the test, there must be no flames left in the oil at the end, and the oil is observed for a further 20 minutes in case re-ignition occurs.
You are allowed 3 tests and the extinguisher must pass two of the three to be deemed successful for class F rating.

In the U.S. the fire tests, as detailed in UL7111, are very similar for all classes of fire but there are subtle differences such as the height of the Class A crib, shape of the Class B tray, or the number of liters required for Class K. Firexo is currently undertaking the UL Certification and Approval process and hopes to achieve UL Listing as early as Q1 2021. Please watch this space because we will be updating it to the show the UL fire tests as they are achieved, demonstrating why Firexo is the most effective fire fighting media on the market today.



Available sizes:

Compact0.5gal1.5gal2.5galPan-Fire Extinguishing Sachet

Fire test guidelines are designed to be several times the magnitude of anything the extinguisher would be expected to tackle in the real world.