The short answer is no. The filter media is made from glass fiber so is not flammable. When the filter medium is tested for ignitability both a clean unused filter and a filter contaminated with DPM is tested to see if it is possible to ignite it.
Following reported incidents in the USA where sparks were seen coming from a filter canister of a high temperature filter used in dry exhaust system, MSHA conducted laboratory tests (MSHA Filter Ignition Report PAR 090100) on high temperature filters to understand what had occurred.
Upon the completion of the testing, it was discovered that the diesel particulate matter (DPM) combined with fuel/oil collecting on the filter media was the material that had ignited and burned, not the filter media. This ignition occurred at temperatures above 650°F (343°C). Test conducted with DPM loaded filters with no additional diesel fuel and lubricating oil added returned ignition temperature results in excess of 1000°F.
All explosion proof (permissible) diesel engines approved for use in underground coal mines and equipped with wet scrubbers in Australia and the USA must be fitted with temperature sentinels that shut the engine down if the temperature of the exhaust gas exiting the scrubber exceed 77°C.
The FST high temperature filters are rated to 343°C or 150°C depending upon the sealing material used on the end of the filter or the filter canister. Other filters currently in use in Australia are rated to between 100°C and 150°C.