1 fluorspar by m michael miller traditionally has been considered vital to the will have be met material stockpiled prior phaseout nation for both national security and economic reasons it is or recycled used directly indirectly manufacture products such as aluminum gasoline insulating foams refrigerants steel uranium fuel most consumption trade involves either acid grade which greater than 97 calcium fluoride metallurgical less in united states one producer supplied about 8 5 of s requirements calculated a percentage apparent this included processed from mined ore defense stockpile nds additional entered us supply through direct sales consumers distributors supplementing domestic source fluorine but not production calculations was byproduct fluorosilicic some phosphoric producers according bureau census geological survey usgs imports increased more 13 compared with 1994 figures hydrofluoric hf were 3 higher those reported
