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EC number: 294-409-3
CAS number: 91722-09-7
Substance formed during processing of liquid steel or during production of iron castings. Consists primarily of fused silicates and trace elements as oxides as well as trace of alloying elements.
Ferrous slag particles are of irregular shapeFerrous slags are virtually free of fibres according to the fibre definitions of OECD and WHOFerrous slags are virtually free of asbestosThe marketed products contain particles of a grain size of less than 0.1 mm. The exact amount of these particles depends on the chemical composition, the slag production, the treatment and the use of the slags.
Particle size distribution
Particle size of marketed air-cooled and granulated blast furnace slag
(ABS and GBS) was analyzed according to US ASTM method D422. The
fraction of slag with a particle size smaller than 0.005 mm is small
(less than 2 %). Due to particle size D10 (10percentile of diameter) of
approximately 0.17 mm, only a very small portion of the marketed slag
material has the potential for aerial transport and inhalative exposure.
Ground GBS (for production of cement) has a particle size distribution
with the D50 of approximately 10 µm diameter with approximately 15 % w/w
in the range of 1-5 µm (for comparison, for typical cement clinker
approximately 15 to 50 % w/w are in the 1-5 µm fraction).
Ground GBS has the potential for aerial transport and inhalative
exposure, and fine particles may enter the alveoles of the lungs.
ABS: Particles of ferrous slag are of irregular shape with sharp edges
and occasionally with elongated needle-shaped forms. ABS may contain
traces of fibrous structures (0.139 % w/w) according to OECD 110
definition (water solubility not tested).
GBS: There is no evidence that GBS (including GGBS) may contain fibrous
GBS has no potential for deleterious effects caused by fibres.
Ferrous slag particles, including fine dust, are of irregular shape.
Ferrous slags are virtually free of fibres according to the fibre
definitions of OECD and WHO
Ferrous slags are virtually free of asbestos
The marketed products contain particles of a grain size of less than 0.1
mm. The exact amount of these particles depends on the chemical
composition, the slag production, the treatment and the use of the slag.
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.Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
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