Graphite Pneumoconiosis Complicated by Cavitation due to Necrosis

Environmental and health effects review for obscurant graphite flakes. Final report, 1991 July--1993 May

“…These researchers demonstrated an induction of fibrotic lesions by inert dusts when quartz was added to the dust and administered by intraperitoneal injection or aerosol exposure. Graphite dusts causing pneumoconiosis in humans were found to contain from 2% to 25% free silica (Uragoda 1974;Gloyne et al 1949;Dunner and Bagnall 1946). Acute exposure studies with rats have demonstrated that graphite without contaminating silica produced minimal, reversible pulmonary effects (Thomson et al 1986 andAnderson et al 1987).…”

Pneumoconiosis Due to Graphite Dust

“…According to Strong (1945), it contains from 50 to 97 per cent of carbon in its natural form. Dunner and Bagnell (1946) gave figures for powered graphite purchased in the open market and for a fraction thereof prepared by blowing a current of air through it. The latter yielded the following: loss on ignition (mainly carbon) 52.7, total silica 25.1, and soluble silica 0.26 per cent.…”