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3.4. Limiting Oxygen Index (LOI) and UL-94 Tests

AS Arne Schirp
JD Jan Dannenberg
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The LOI is the minimum concentration of oxygen, by volume percentage, in a mixture of oxygen and nitrogen at 23 ± 2 °C that will just support combustion of a material under specified test conditions (DIN EN ISO 4589-2). If a test specimen is hard to burn, more oxygen is required to cause flaming combustion and LOI is increased. The tests were done with a LOI analyzer (Dynisco, Franklin, MA, USA) using injection-molded specimens (80 mm × 10 mm × 4 mm).

UL-94 vertical (V) tests were performed based on IEC 60695-11-10 with 0.8 mm thick pressed sheets and with profile segments of 13 mm width (100 mm profile length).

Copyright and License information:  ©2021 by the authors.
Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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