So I need to clean my canisters today and I went out and picked up some fiber fill from the craft store. They had a couple brands to choose from, but none of them stated whether it was flame retardant. I did pull a piece off and lit it on fire. It does burn and the flame will spread but eventually goes out. It is 100% polyester fiber but I'm just not sure whether it's safe to use. Anyone have any insight on this? If this is no good could someone recommend a brand I could use?