ASTM D5306 – Linear Flame Propagation Rate of Lubricaing Oils and Hydraulic Fluids
During use, hydraulic fluids and lubricating oils may be exposed to very hot surfaces or ignition sources, potentially causing the fluid to ignite. Once ignited, the flame may safely auto-extinguish or it may travel rapidly, leading to dangerous conditions. This test evaluates how quickly a flame on an ignited fluid will travel down a linear surface. It may be used to evaluate relative flammability of lubricating oils and hydraulic fluids.
A ceramic fiber string is immersed in the sample, stretched across supports and ignited. The time it takes the flame to travel along the string is determined. Reported is the flame propagation rate in cm/sec.