ex 1 furnaceblack 3 58 40 260 30 78 3200 comp ex 2 graphitizedcarbon black 3 44 94 420 30 99 1050 comp ex 3 ______________________________________ sup primary particles as can be seen clearly in the table when acetylene black was used as the starting carbon material graphite fluoride was obtained at very high yield and the particle size of the obtained graphite fluoride was remarkably small in contrast the graphite fluorides produced from furnace blacks were very larger in particle size though the primary particles of the furnace blacks were fairly small furthermore dispersibilities of the graphite fluorides obtained in the above example and comparative examples were examined by the following test method first 1 g of the graphite fluoride for testing was added to 99 g of an organic liquid which was alternatively selected from ethanol acetone and butyl ether and was dispersed in the liquid by an ultrasonic agitation method the resultant dispersion was put into a 100 ml test tube 25 mm in inner diameter and 250 mm in length and was left standing as the graphite fluoride particles slowly settled an upper layer of the liquid in the test tube gradually became clear and almost transparent the vertical distance between the liquid surface in the test tube and the interface between the clear liquid layer and the lower layer in which graphite fluoride particles were still dispersed slowly increased as time elapsed the measurements were as shown in tables 2 to 4 wherein 34 settling level 34 refers to the aforementioned interface the results of this test are clearly indicative of superiority in dispersibility of the.