The Steiner Tunnel test is used to determine the:

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The main concept here is how interior finish materials behave when exposed to flame on a surface—that is, their surface-burning characteristics. In the Steiner Tunnel test, a sample of an interior finish is placed in a long tunnel and ignited at the end. The test measures how quickly the flame spreads across the surface and the amount of smoke produced, yielding a flame-spread rating used for codes and standards. This focuses specifically on how the material’s surface behaves in a fire, which is different from broader fire resistance ratings for assemblies, or from whether a material is a composite and how it is installed. So the Steiner Tunnel test is used to determine the surface-burning characteristics of interior finishes.