N,N''-(methyl-m-phenylene)bis[N',N'-dimethylurea]

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

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 m^2/cm^3	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.