ASTM D6668 Standard Test Method for Discrimination Between Flammability Ratings of F = 0 and F = 1
4. Summary of Test Method
4.1 Small, measured amounts of the sample are placed on a stainless steel surface heated to 1500°F (815.5°C). Reactions which occur during the 5 min interval, thereafter, are observed and recorded.
5. Significance and Use
5.1 A material which does not exhibit any evidence of burning as defined herein under the conditions of the test procedure may be classified as Flammability Degree of Hazard Zero material (F=0) provided other properties of the material are not such as to require a higher degree of classification.
