What is the MAXIMUM flame spread index for insulation materials?

The maximum flame spread index for insulation materials is 25. This index is part of the criteria used to evaluate the fire safety of materials in building construction. It measures how quickly flames travel across the surface of a material when exposed to a fire source.

Materials with a flame spread index of 25 or lower are classified as having good fire-resistance properties, meaning they are less likely to contribute significantly to fire spread. This is particularly important in commercial buildings where fire safety regulations are stringent and the risk of fire must be managed carefully to protect occupants and property.

Using a maximum value of 25 ensures a balance between performance and safety, allowing for effective insulation while maintaining a safer environment. The choice of a higher flame spread index would imply a greater propensity for flames to spread rapidly, which is generally considered unacceptable in building materials under current safety standards.