Rate of Burning and/or Extent and Time of Burning of Plastics in a Horizontal Position
This standard test method tests the relative linear rate of burning or extent and
time of burning, or both, of plastics in the form of bars, molded or cut from sheets,
plates or panels, and tested in the horizontal position.
The test specimen shall be a cut piece with all edges smooth from the final product
material and approximately 13mm x 125mm x >3mm (½” x 4-15/16” x >⅛”) in size. On
each specimen there shall be two drawn lines at 25mm and 100mm from the exposed
end. For the test, this skylight dome material, or other specific bar specimen,
shall be horizontal, but rotated 45°, and attached at one end. At the opposite,
exposed end the material shall be exposed to a 20mm (¾”) high blue flame for 30
The material is then measured for time and extent of burning, if more than 100mm.
If the material burns more than 100mm during the specified time then the average
rate of burning is reported. The specimen should be tested within a 0.5m³ (19-11/16”³)
testing unit with an environment of 15°C – 35°C (59°F – 95°F) & 45% – 75% relative
humidity. This process is repeated until three specimens have burned to or beyond
100mm or ten specimens have been tested. The rate of burning is thus calculated