Registration Dossier
Registration Dossier
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EC number: 215-231-4 | CAS number: 1314-35-8
Particle size distribution (Granulometry)
Administrative data
Link to relevant study record(s)
- Endpoint:
- particle size distribution (granulometry)
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- N/A to 2009-05-08
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study with acceptable restrictions
- Remarks:
- Well documented, scientifically sound study that used appropriate measurement instrumentation. Work performed following cGMP. Report was reviewed by laboratory Quality Assurance Department.
- Qualifier:
- according to guideline
- Guideline:
- other: see principles of method if other than guideline.
- Principles of method if other than guideline:
- The particle size was analysed by the Malvern MasterSizer LASER diffracter. This instrument is an ensemble analyser that calculates a volume distribution from the LASER diffraction pattern of a cloud of particles. This raw scatter data is then processed using a complex algorithm and presented on the basis of an equivalent spherical diameter. This instrumentation is approved by ECHA Guidance, 2008 (Chapter R.7a, pg 148)
- GLP compliance:
- not specified
- Other quality assurance:
- other: GMP
- Type of method:
- Laser scattering/diffraction
- Type of particle tested:
- primary particle
- Type of distribution:
- volumetric distribution
- Key result
- Percentile:
- D10
- Mean:
- 7.33 µm
- St. dev.:
- 0
- Key result
- Percentile:
- D50
- Mean:
- 28.32 µm
- St. dev.:
- 0
- Key result
- Percentile:
- D90
- Mean:
- 60.91 µm
- St. dev.:
- 0
- Conclusions:
- This tungsten trioxide registraion covers a highly pure (>99.0%) monoconstituent substance with a monoclinic form, traces of ammonia and carbon, and a particle size distribution on the microsized region.
Reference
No specific standard deviation were identified for the particle distribution data although significant robust data was presented in the laboratory report.
The B.E.T. Surface Area of the test substance sample was determined to be 3.71 m^2/g.
Description of key information
Mean D10, D50, and D90 = 7.83, 28.32 and 60.91 µm, respectively.
The specific surface area of the test substance sample (as determined by B.E.T.) was found to be 3.71 m2/g.
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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