Quick Answer: What Is The Maximum Flame Spread Index For Insulation Materials?

What is class O paint?

Class 0 – is an additional level of protection for walls or ceilings where limited combustibility is required in high-risk areas, such as escape routes.

To comply with Class O materials must have a Class 1 Surface Spread of Flame and low fire propagation index, in accordance with BS 476 Part 6..

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 the best flame spread rating?

The most commonly used flame-spread classifications are: Class I or A, with a 0-25 FSR; Class II or B with a 26-75 FSR; and Class III or C with a 76-200 FSR. In general, inorganic materials such as brick or tile are Class I materials.

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 does ASTM stand for?

American Society for Testing and MaterialsASTM International, formerly known as American Society for Testing and Materials, is an international standards organization that develops and publishes voluntary consensus technical standards for a wide range of materials, products, systems, and services.

What does ASTM E 84 mean?

Standard test method for surface burning characteristicsASTM E 84. Standard test method for surface burning characteristics of of building materials. The flame spread Index and Smoke Developed Index values obtained by the ASTM E 84. test are used by code officials and regulatory agencies in the acceptance of interior finish. materials for various applications.

What is ASTM E 84 fire rating?

The ASTM E-84 (often referred to as just “E-84”) is the standard test method for assessing the surface burning characteristics of building products. … FSI is the measurement for the speed at which flames progress across the interior surface of a building, while SDI measures the amount of smoke a sample emits as it burns.

What is Class 3 surface spread of flame?

Class 3 – Surface of medium flame spread. This refers to surfaces on which during the first 1½ mins of test, the spread of flame does not exceed 265mm and the final spread of flame does not exceed 710mm under the relevant test conditions.

What is the difference between Class 1 and Class 0 fire rating?

To Summarise: Class 1 – Protects your surface from the spread of flames. Class 0 – Protects your surface from the spread of flames AND limits the amount of heat released from the surface during a fire.

What is a Class A material?

Class A fires involve solid materials of an organic nature such as wood, paper, cloth, rubber and plastics that do not melt. Class B fires involves liquids. … Class D fires involve flammable metals such as magnesium, aluminium, titanium, sodium and potassium.

How is flame spread rating calculated?

From these observations a flame spread rating can be calculated. For example, if the flame travels 19-1/2 feet in less than 5-1/2 minutes (the time required for flame to spread on 19-1/2 feet of red oak), the rating is 100 times 5-1/2 divided by the time (minutes) in which flame spreads 19-1/2 feet on the sample.

What does smoke developed index mean?

Smoke-developed index (abbreviated SDI) is a measure of the concentration of smoke a material emits as it burns. Like the Flame Spread Index, it is based on an arbitrary scale in which asbestos-cement board has a value of 0, and red oak wood has 100.

What is a Class C wall finish?

Class C interior finish materials shall be permitted for wainscotting or paneling of not more than 1,000 square feet of applied surface area in the grade lobby where applied directly to a noncombustible base or over furring strips applied to a noncombustible base and fireblocked as required by Section 803.3. 1.

What is class A fire retardant?

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.

What does CFL s1 mean?

Cfl – s1. combustible materials – medium contribution to fire. D – s1 d0. D – s2 d0. D – s3 d0.