What is the maximum smoke developed index for class A interior finish materials?

The maximum smoke developed index for class A interior finish materials is set at 450. This rating is determined by testing materials in accordance with the ASTM E84 test method, also known as the Steiner tunnel test. The smoke developed index measures the amount of smoke produced by a material when it is subjected to flame.

Class A finishes are considered to have the best fire performance characteristics, which means they generate the least amount of smoke. A smoke developed index of 450 indicates these materials are suitable for use in areas that require stringent fire safety measures, such as public buildings and other high-occupancy structures.

Understanding the smoke developed index is crucial for ensuring compliance with building codes and safety regulations, as excessive smoke production in a fire situation can significantly impact visibility and evacuation efforts.