Sodium Benzoate, air milled [NaC7H5O2] -325 mesh, white powder. Used as a fuel in making whistle composition in rockets and in shell burst charges. PLEASE NOTE THAT ALL CHEMICALS ARE SHIPPED IN A HEAVY DUTY PLASTIC BAG INSIDE A RE-USUABLE MICROWAVABLE PLASTIC TUB AND AN ADDITONAL PLASTIC OUTER WRAP. THIS EXTRA STEP THAT WE DO COSTS MORE, BUT INSURES THAT YOUR ITEM ARRIVES INTACT. ALSO THE CONTAINER KEEPS YOUR PRODUCT FRESH.