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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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.
Use of this information is subject to copyright laws and may require the permission of the owner of the information, as described in the ECHA Legal Notice.
EC number: 275-735-5 | CAS number: 71630-92-7 Substance obtained by burning the husk removed from the rice paddy. Contains silica as well as the elements aluminum, calcium, carbon, chromium, copper, indium, iron, lead, magnesium, manganese, molybdenum, phosphorus, silver, sodium, tin, and zinc.
Particle size distribution (Granulometry)
Administrative data
Link to relevant study record(s)
Description of key information
In a granulometry study three different types of rice husk ashes were tested. In the test substance type 1 (fine), the fraction <100 µm was 100% (w/w). The percentage <100 µm in test substance 2 was 28.7% (w/w) and and in test substance 3 23.2% ( w/w) respectively. The mass median diameter of the fraction <100 µm was 1.0 µm in test substance 1, 51.6 µm in test substance 2 and 48.0 µm in test substance 3 (Currenta, 2009).
Additional information
The percentage of the crystalline particles in the relevant fraction for respiration (<5 µm) was calculated. It ranged from 0.99% (test substance 1) to 8.0% (test substance 2). This means that - depending on the outcome of the granulometry/crystallinity study, different types of rice husk ashes may be differently classified according to T, R48/23 or Xn, R48/23 or not classified (see chapter classification and labelling).
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.
