Insulation Manufacture
Almost 5000 men who manufactured insulation board in London used a mixture of chrysotile and amosite, but not crocidolite. In some areas, 30 f/ml of asbestos in air were found in the plant during the late 1960s, but higher levels were probably encountered prior to 1964. Five mesothelioma and nine asbestosis deaths were certified (Cape Factory C in Browne and Smither, 1983; Acheson et al., 1984). In another Cape Industries factory (Cape Factory B), 13 mesotheliomas were observed among approximately 2000 workers (Browne and Smither, 1983). Mortality studies of 162 Belfast insulation workers and 6292 dockyard workers are included in Table 2 because the types of asbestos fibers are reported as mixed, although the composition and exposure levels are unknown (Elmes and Simpson, 1977; Rossiter and Cole, 1980; see Smith and Wright, 1996).