A material with a flame spread index of 0-25 falls into which class?

A material with a flame spread index of 0-25 falls into which class?

• A. Class A
• B. Class B
• C. Class C
• D. Class D

Answer: (A)

Understanding flame spread index and how it maps to classification helps explain why this material falls into Class A. The flame spread index measures how quickly flames travel across a material’s surface when exposed to flame. Smaller numbers mean slower spread and better surface fire performance. In the standard classification scheme, a flame spread index of 0–25 is designated as Class A, 26–75 as Class B, and 76–200 as Class C. Therefore a material with a flame spread index of 0–25 fits Class A because it exhibits the lowest, most favorable surface burning characteristics among the main classes. This classification is used to compare interior finishes for code compliance and fire safety. Remember, this rating covers surface burning behavior, not overall ignition or smoke production.

Understanding flame spread index and how it maps to classification helps explain why this material falls into Class A. The flame spread index measures how quickly flames travel across a material’s surface when exposed to flame. Smaller numbers mean slower spread and better surface fire performance. In the standard classification scheme, a flame spread index of 0–25 is designated as Class A, 26–75 as Class B, and 76–200 as Class C. Therefore a material with a flame spread index of 0–25 fits Class A because it exhibits the lowest, most favorable surface burning characteristics among the main classes. This classification is used to compare interior finishes for code compliance and fire safety. Remember, this rating covers surface burning behavior, not overall ignition or smoke production.