Quick Answer: What Is Class A Fire Resistance?

What is meant by fire resistance?

Fire resistance is the property of materials or their assemblies that prevents or retards the passage of excessive heat, hot gasses or flames under conditions of use (NYCBC, 2008).

Fire resistance of materials is quantified by means of fire resistance rating..

What is fire rating E?

Fire resistance class E – Integrity The fire does not reach the non-fire side via flames passage or substantial amounts of hot gases.

What are the 5 types of materials?

We use a wide range of different materials daily; these might include:metal.plastic.wood.glass.ceramics.synthetic fibres.composites (made from two or more materials combined together)

What types of materials fuel a Class A fire?

Class A: Class A fires use flammable material as their fuel source. Wood, fabric, paper, trash,and plastics are common sources of Class A fires.

What is class A fire rating mean?

A material rated as Class A would have a lower flame spread, and therefore a better performance rating, than a Class C material. The results of the flame spread test results in a numeric rating. If the numeric value is less than 25, then a Class A flame spread index is assigned.

How long is Class A fire rating?

Class A – Flame-spread 0-25, smoke developed 0-450. Class B – Flame-spread 26-75, smoke developed 0-450. Class C – Flame-spread 76-200, smoke developed 0-450….Exterior Wall Construction.Description of FinishTime (minutes)5/8-inch Type X gypsum wallboard40Double 3/8-inch gypsum wallboard259 more rows

What is Class A Class 1 fire rating?

With a flame spread of 25 or less, cellulose has a Class 1 Fire rating. Walls with cellulose insulation are one-hour (or greater) fire walls and can help control the spread of fire. It also has a very low smoke development index level.

What is a Class A material?

Class A fires are defined as ordinary combustibles. These types are fires use commonly flammable material as their fuel source. Wood, fabric, paper, trash ,and plastics are common sources of Class A fires. … Class A fires are commonly put out with water or monoammonium phosphate.

What type of fire is a Class A?

There are four classes of fires: Class A: Ordinary solid combustibles such as paper, wood, cloth and some plastics. Class B: Flammable liquids such as alcohol, ether, oil, gasoline and grease, which are best extinguished by smothering.