Is there any presence of crystalline silica in after use fibre?
As with any silica rich MMVF, when Superwool 607 HT fibres are heated to temperatures above 1000C, devitrification may occur leading to the formation of crystalline silica This is the same effect as with RCF. Data from the CARE Programme, however, show the level of crystalline silica in the respirable fraction of the airborne dust (as measured on workers in furnace removal operations), is below the detection limit in the majority of the sampling tests. Controlling fibrous dust levels below the applicable exposure limit value will also ensure that crystalline silica exposure levels are not exceeded.
