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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
Study period:
18 May 2018
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
test procedure in accordance with generally accepted scientific standards and described in sufficient detail
Qualifier:
according to guideline
Guideline:
other: HLB-QC148
Deviations:
not applicable
GLP compliance:
no
Type of method:
sieving
Type of particle tested:
primary particle
Type of distribution:
mass based distribution
Specific details on test material used for the study:
SOURCE OF TEST MATERIAL
- Source and lot/batch No.of test material: H. L. Blachford
- Expiration date of the lot/batch: no data
- Purity test date:

STABILITY AND STORAGE CONDITIONS OF TEST MATERIAL
- Storage condition of test material:
- Stability under test conditions:
- Solubility and stability of the test substance in the solvent/vehicle:
- Reactivity of the test substance with the solvent/vehicle of the cell culture medium:

TREATMENT OF TEST MATERIAL PRIOR TO TESTING
- Treatment of test material prior to testing:
- Preliminary purification step (if any):
- Final dilution of a dissolved solid, stock liquid or gel:
- Final preparation of a solid:

FORM AS APPLIED IN THE TEST (if different from that of starting material)

TYPE OF BIOCIDE/PESTICIDE FORMULATION (if applicable)

OTHER SPECIFICS:
- measurement of pH, osmolality, and precipitate in the culture medium to which the test chemical is added:
- other information:
Key result
Percentile:
other: 0
Mean:
> 4.75 mm
Remarks on result:
other: no other data available
Key result
Percentile:
other: 0
Mean:
> 2.36 mm
Remarks on result:
other: no other data available
Key result
Percentile:
other: 68.6%
Mean:
> 0.3 mm
Remarks on result:
other: no other data available
Key result
Percentile:
other: 14.2%
Mean:
> 0.15 mm
Remarks on result:
other: no other data available

As the particle size distribution for iron stearate sample was broad and beyond laser measurement’s range, different sieve mesh sizes were used. 50.0 grams of material were weighted usingtop loading balanceinto a 16 oz paper cup. Then the contents were carefully transferred into the stack of sieves including sieve #4, #8, #50 and 100 mesh fitted with a collection pan. Sieve shaker was used for 10 min. Retained percentage was calculated as follows:

Mesh sizes

#4

#8

#50

#100

pan

% Retained

0

0

68.6

14.2

16.9
Conclusions:
The sieve test showed that iron stearate is a coarse powder with 68.6% being retained by a 300 µm sieve.

Description of key information

The sieve test showed that iron stearate is a coarse powder with 68.6% being retained by a 300 µm sieve.

Additional information