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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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: 231-130-8 | CAS number: 7440-21-3
Guidance on Safe Use
Administrative data
First-aid measures
Inhalation: Mechanical irritation caused by dust in the airways: Remove person from Silicon - dust-exposed area.
Skin contact: Wash skin with water and/or a mild detergent.
Eye contact: Rinse eyes with water/saline solution. See a physician upon persistent discomfort.
Ingestion: Remove source of further ingestion. See inhalation.
Fire-fighting measures
Silicon lumps are not combustible.
Specific fire & explosion hazards : Although flammability test under REACH (EC guideline) show silicon to be non flammable, small silicon particles (up to 40 micometer) can be ignited and propagate flame that extinguish quickly.
Addition of wet material to molten Silicon, may cause explosions due to formation of flammable hydrogen gas.
Silicon-particles suspended in air, may under certain conditions cause dust explosions.
The flammability and intensity of the blast increases gradually as particle size decreases.
Extinguishing media: Dry sand, CO2 or dry powder..
Accidental release measures
Avoid handling that generates dust build-up. Released material should be collected in suitable containers. Damp or wet product must be kept away from dry, and must not be collected and stored in closed containers.
Silicon in the form of dry fine dust should be vacuumed, using a spark-proof vacuuming system, rather than swept up
Handling and storage
Handling: Avoid generation of dust. Wear protective clothing, gloves, and goggles. Wear suitable respiratory protection where applicable
Avoid generating sparks or other ignition sources (e.g. welding) in areas with high dust concentrations.
Addition of wet material to molten Silicon may cause explosions due to formation of flammable hydrogen gas.
Avoid reactions with acids like hydrofluoric acid (HF) and nitric acid (HNO3) leading to the formation of toxic gases.
Storage: Keep dry.
Transport information
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Marine transport (UN RTDG/IMDG)
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Exposure controls / personal protection
Stability and reactivity
Disposal considerations
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.
