Octaphenylcyclotetrasiloxane

Particle size distribution (Granulometry)

Link to relevant study record(s)

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:

study well documented, meets generally accepted scientific principles, acceptable for assessment

Principles of method if other than guideline:

The particle size distribution was performed by weighing sieves with defined mesh numbers before and after the sieving process.

GLP compliance:

not specified

Type of method:

sieving

Type of particle tested:

aggregate

Type of distribution:

mass based distribution

Key result

Percentile:

D50

Mean:

ca. 125 - ca. 250 µm

Remarks on result:

other: The median particle size is for the substance as received

Percentile:

D50

Mean:

ca. 63 - ca. 90 µm

Remarks on result:

other: The median particle size is for the substance as milled

Particle size analysis

Test substance as received

Sieve size (µm)	Weight on sieve (g)	% by weight
>2000	0.0	0.0
>1000	0.0	0.0
>500	0.2	0.1
>250	1.3	0.5
>125	226.5	78.9
>90	45.8	15.9
>63	8.9	3.1
>38	1.5	0.5
Receiver	3.0	1.0

 

Median particle size is 125 to 250 µm

Test substance (milled)

Sieve size (µm)	Weight on sieve (g)	% by weight
>2000	2.7	1.4
>1000	4.2	2.2
>500	3.8	2.0
>250	6.3	3.4
>125	19.6	10.5
>90	14.4	7.7
>63	54.6	29.2
>38	56.3	30.1
Receiver	25.0	13.4

 

Median particle size is 63 to 90 µm

Conclusions:

Median particle size of 125 - 250 µm was determined for the substance as received, which is relevant for the substance as placed on the market, using a relevant test method. The result is considered to be reliable.

Description of key information

Granulometry: Median particle size: 125 - 250 µm (sieve method)

Additional information

A median particle size in the range of 125 - 250 µm is using a sieve method is determined for the submission substance as received, which is relevant for the substance as placed on the market. The result is considered to be reliable.