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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:
August 2011
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
test procedure in accordance with national standard methods with acceptable restrictions
Qualifier:
according to guideline
Guideline:
ISO 13320 (Particle size analysis - Laser diffraction methods)
Principles of method if other than guideline:
Laser diffraction method - The test was conducted according to the guidance of the apparatus used. A short description is given below:
The dry test substance is dispersed and passes a laser in form of an aerosol. In dependence on the particle size the laser is diffracted. The resulting so called “Fraunhofer” diffraction spectrum is bundled using a converging lens in a multi-element photo detector. In dependence of the particle size distribution a radial symmetric intensity distribution is generated. The measured intensity is analysed by a computer and converted into a particle size distribution.
GLP compliance:
yes
Other quality assurance:
ISO/IEC 17025 (General requirements for the competence of testing and calibration laboratories)
Type of method:
Laser scattering/diffraction
Type of particle tested:
primary particle
Type of distribution:
volumetric distribution
Key result
Percentile:
D10
Mean:
ca. 0.65 µm
Remarks on result:
other: SD not determined
Key result
Percentile:
D50
Mean:
ca. 1.48 µm
Remarks on result:
other: SD not determined
Key result
Percentile:
D90
Mean:
ca. 4.88 µm
Remarks on result:
other: SD not determined
Key result
Percentile:
other: D98
Mean:
ca. 8.05 µm
Remarks on result:
other: SD not determined
Key result
Percentile:
other: D100
Mean:
ca. 15 µm
Remarks on result:
other: SD not determined
No.:
#1
Size:
0.65 µm
Distribution:
10 %
No.:
#2
Size:
1.48 µm
Distribution:
50 %
No.:
#3
Size:
4.88 µm
Distribution:
90 %
No.:
#4
Size:
15 µm
Distribution:
100 %

Parameter

Result

Method

10 % of the sample

Particle size

≤ 0.65 µm

Laser Difffraction

50 % of the sample

Particle size

≤ 1,48 µm

Laser Difffraction

90 % of the sample

Particle size

≤ 4.88 µm

Laser Difffraction

95 % of the sample

Particle size

≤ 6.40 µm

Laser Difffraction

98 % of the sample

Particle size

≤ 8.05 µm

Laser Difffraction

100 % of the sample

Particle size

≤ 15.00 µm

Laser Difffraction

SMD

≤ 1.31 µm

Calculated

VMD

≤ 2.20 µm

Calculated

SV

≤ 4.59 m2/cm3

Calculated

Conclusions:
The median value of particle size of TDI urone is 1.48 µm.
Executive summary:

The granulometric properties of TDI urone were analysed with the laser diffraction method according to guideline ISO 13320 -1. The particle size distribution was determined using the particle size analysator HELOS KF (H0119) from Sympatec with a Sympatec RODOS dry dispersing unit. The test material was dried via dispersing and run in form of an aerosol fluent through a laser beam. The median value of particle size is 1.48 µm.

Description of key information

The median value of particle size of TDI-Urone is 1.48 µm.

Additional information

The granulometric properties of TDI-Urone were analyzed with the laser diffraction method according to guideline ISO 13320-1. The particle size distribution was determined using the particle size analyzer HELOS KF (H0119) from Sympatec with a Sympatec RODOS dry dispersing unit. The test material was dried via dispersing and run in form of an aerosol fluent through a laser beam. The median value of particle size is 1.48 µm.