What is a Class B fire rating?
What is a Class B fire rating?
Fire extinguishers with a Class B rating are effective against flammable liquid fires. These can be fires where cooking liquids, oil, gasoline, kerosene, or paint have become ignited. Two commonly used chemicals are effective in fighting these types of fires.
What does FRTW mean?
Questions and answers about fire-retardant-treated wood (FRTW) Q: What is FRTW? A: FRTW is wood impregnated with chemicals during manufacture that, when tested, has a flame spread index of 25 or less and no evidence of significant progressive combustion when the test is continued for an additional 20 minutes.
Is pressure treated wood FRTW?
FlameTech™ Pressure Treated Lumber & Plywood is a pressure impregnated, high performance, Class-A Rated, Fire Retardant Treated Wood (FRTW) product designed for a wide range of structural, code-compliant applications.
What is the difference between Class A and Class B fire rating?
Class A fire retardants have a flame spread rating of between zero and 25. These materials are effective against severe fire exposure. Class B fire retardants have a flame spread rating of between 26 and 75. These materials are effective against moderate fire exposure.
Which is an example of a Class B fire?
Class B fires involve flammable and combustible liquids such as gasoline, alcohol, oil-based paints, lacquers.
Can wood be fire treated and pressure-treated?
Pressure treating infuses the fire retardant deep into the cells of the wood, not just the surface. The combination of pressure and fire retardant treatments change the chemistry of the wood, so when it is heated, it gives off water and carbon dioxide which slows or stops the spread of flames.
What is Class B fire retardant?
A Class B or Class 2 fire rating is the next best rating on the list. The flame spread rating of Class B would fall between 26 and 75. This rating is typical for slower-burning whole wood materials. A whole wood material would be wood planks that are in the same form as they were when they were cut from the tree.
What is a Class B fire caused by?
flammable liquids
Class B – fires caused by flammable liquids such as paint, turpentine or petrol among others.
