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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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: 231-669-9 | CAS number: 7681-53-0
Particle size distribution (Granulometry)
Administrative data
Link to relevant study record(s)
Description of key information
Particle size distribution:
88.6% particle size larger than 500 µm
99.77% particle size larger than 75 µm
Additional information
One study is reported for this endpoint. This study determined the particle size distribution of sodium hypophosphite using a sample of sodium hypophosphite placed into test sieves (manufactured by Haver and Boecker tested to BS 410 and ISO 565) with sieves apertures of 500, 250, 180, 150, 74, 45 and 32 µm. The test system was shaken during 10 minutes in a vibratory sieve shaker at amplitude 1. Each fraction was then collected and weighted.
The results showed that:
88.6% has a particle size >500µm
99.77% has a particle size >75µm.
The recovery of sodium hypophosphite was very good (99.87%) hence the study is considered reliable without restrictions.
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.
