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NBS Smoke Chamber
The release of smoke generated by the combustion of plastic materials can be determined by
several methods. The most common static test procedure is the National Bureau of Standards (NBS) smoke chamber method,
stanardize in the United States as ASTM E 662. This test was originally developed to determine the smoke generating
characteristics of plastic materials used in aircraft construction. Additionally, the NBS test has also been used to
specify smoke generation in materials for train/subway interiors and industrial flooring.
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The NBS smoke chamber measures smoke density accumulated when a specimen of specified form and thickness is exposed
to a radiant heat sourse of 25 kW/m2. Depending on the application, either the maximum smoke density or the smoke
density at a set time (usually 4 minutes) can be specified. The test can be run with or without the application of
a pilot flame (flaming and smoldering mode, respectively). In addition to smoke, the concentration of toxic gases can
also be measured.
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| The NBS smoke chamber is the cornerstone of the Sherwin-WIlliam's Kemgard® laboratory.
Applications testing is done to demonstrate the performance of Kemgard® smoke suppressants
in various plastics, while new Kemgard® products are being developed to improve smoke
suppression. The Kemgard® laboratory is also available for customer testing
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