The flammability of finished fabric is assessed by using the parameter A) Limiting Oxygen Index B) Pyrolysis Temperature Glass Transition Temperature D) Degradation Temperature
Answers
Flame resistance of PTFE and fluoropolymers has been a unique performance leading to their usefulness in semiconductor factories and Chemical Processing Industries (CPI). Limiting oxygen index (LOI) is the factor commonly used to compare the flammability of polymeric materials. ASTM D2863 and ISO 4589-1,2 define LOI as follows: “Limiting oxygen index is defined as the minimum concentration of oxygen required in the air mixture just to support the downward burning (like a candle) of a vertically placed strip specimen. High oxygen concentration requirement indicates better flame retardancy of the specimen. The oxygen concentration is reported as volume percent.” LOI should not be the only descriptor of the flame resistance of a polymer. This section provides flame resistance information for fluoropolymers such as the ignition temperatures and charring tendencies of fluoropolymers.