Registration Dossier
Registration Dossier
Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.
The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.
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EC number: 273-761-1 | CAS number: 69012-64-2 Amorphous silicon dioxide particles from the volatilization and vaporization of furnace feed materials in the manufacture of ferrosilicon and silicon.
Particle size distribution (Granulometry)
Administrative data
Link to relevant study record(s)
Description of key information
Primary silica fume particles are in the size range of 0.02 - 1.0 µm (average particle size 0.15 µm). During collection, cooling and bagging, the primary particles form larger agglomerates, i.e. assemblies of particles attached to each others due to physical interactions (e.g., van der Waals forces). The results of dustiness test (EN 15051) show that the proportion of respirable particles of the total inhalable silica fume is approx. 1 wt% for undensified silica fume and 2-3 wt% for densified silica fume.
Additional information
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
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