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What is Steiner Tunnel Test
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A fire test that has been used for over 50 years is ASTM E 84,Standard Test Method for Surface Burning Characteristics of Building Materials. ASTM E 84 is also known as the Steiner Tunnel Test,named after Edward Steiner, who was an engineer at Underwriters Laboratories who developed the test apparatus. The test involves comparing the performance of the material being evaluated to two materials which have predictable and reproducible test results. The test results are reported as a material’s Flame Spread Index (FSI) and
Smoke Developed Index (SDI). FSI and SDI are a comparative measure, expressed as a dimensionless number, derived from visual measure ments of the spread of flame or smoke obscuration versus time for a material tested in accordance with ASTM E 84 or UL Standard 723.

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