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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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.

Diss Factsheets

Physical & Chemical properties

Particle size distribution (Granulometry)

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Reference
Endpoint:
particle size distribution (granulometry)
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Conducted according to suitable methodology and acceptable for assessment. This study is considered to be scientifically justified for use as a key study.
Qualifier:
no guideline followed
Principles of method if other than guideline:
The determination of particle size was made by a screening process with a specific mesh size in an air jet made by subpressure.
GLP compliance:
no
Type of method:
other: The determination of particle size was made by a screening process with a specific mesh size in an air jet made by subpressure.
Type of distribution:
volumetric distribution
Percentile:
D50
Remarks on result:
other: Migrated from fields under 'Mass median diameter' as D50 percentile. No source field for Standard deviation.
No.:
#1
Size:
< 45 µm
Distribution:
> 99 %

PROCEDURE:

Install test sieve, prescribed by the specification of the product. Weigh exactly 100 g of the sample into the weighing bottle and transfer it on to screen. Closed the lid and sieve for 3 mins in total. If fine materials stick together, they must be spread out with low pressure by using a brush during the sieve machine works.

Then close the lid again and sieve for the rest of the time. Weigh the oversize after 3 mins sieving.

 

 

Calculation:

 

Screen oversize (%) = residue (g) *100 /weight in g

Screen undersize (%) =100% - % screen oversize

Conclusions:
Particle size distribution indicates the substance is an inhalation risk (a significant proportion of the particles are present at < 100 µm).

Description of key information

Additional information

Particle size distribution indicates the substance is an inhalation risk (a significant proportion of the particles are present at < 100 µm).