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Steiner Tunnel Test
Building codes and regulations continue to stress lower flame spread and low smoke generation for
many materials. The Steiner Tunnel (ASTM E-84) is frequently referenced as a method to assess flame spread and smoke
density and is a mandated test for many commercial building materials. The test consists of a 25' vented tunnel,
lined with firebrick, with the test material mounted to the top of the chamber. At one end of the chamber, the sample is
subjected to a high-energy flame for ten minutes. Flame spread is determined visually through windows built into the tunnel. An optical cell
mounted at the tunnel exhaust measures smoke density.
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A similar test used to qualify plenum grade communication cable is UL 910. In this case, the test specimens are
multiple cable constructions. Requirements for plenum cable are considered the most restrictive in the industry.
Qualification of flame retarded materials by either E-84 or UL 910 is a major hurdle involving considerable time
and expense.
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