Calcium cyanamide

Particle size distribution (Granulometry)

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

particle size distribution (granulometry)

Type of information:

experimental study

Adequacy of study:

key study

Study period:

1991

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

guideline study without detailed documentation

Qualifier:

no guideline followed

Principles of method if other than guideline:

dry sieve analysis

GLP compliance:

not specified

Type of method:

sieving

Type of particle tested:

primary particle

Type of distribution:

volumetric distribution

Key result

Percentile:

D50

Mean:

ca. 40 µm

Remarks on result:

other: Standard deviation not available.

No.:

#1

Size:

< 355 µm

Distribution:

99 %

No.:

#2

Size:

< 200 µm

Distribution:

93 %

No.:

#3

Size:

< 125 µm

Distribution:

81 %

No.:

#4

Size:

< 71 µm

Distribution:

66 %

No.:

#5

Size:

< 63 µm

Distribution:

63 %

No.:

#6

Size:

< 51 µm

Distribution:

56 %

No.:

#7

Size:

< 32 µm

Distribution:

43 %

No.:

#8

Size:

< 20 µm

Distribution:

30 %

Conclusions:

The mass median diameter of calcium cyanamide, technical grade (Kalkstickstoff hochprozentig) was determined to be 40 µm as measured by dry sieve analysis.

Executive summary:

The mass mean diameter of calcium cyanamide technical grade was determined using dry sieve analysis. Therefore the about 80 g of the test item was partitioned using a sample splitter. After the defined sieving time the residues on each sieve was determined and the mass median diameter was calculated to be 40 µm.

Reference 2

Endpoint:

particle size distribution (granulometry)

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2014-07-01 to 2014-07-04

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Remarks:

The study is regarded as reliable without restrictions. The study was conducted under GLP equivalent conditions. The study was conducted under supervision of a quality assurance unit which had ensured e.g instrumentation validation, reagent/materials certification, analyst certification and providing standard operating procedures. The study was conducted according to CIPAC guideline. For read across justification please refer to IUCLID section 13.

Qualifier:

equivalent or similar to guideline

Guideline:

other: CIPAC MT 170 Dry sieve analysis of water dispersible granules dated 1994

Deviations:

no

GLP compliance:

yes

Remarks:

The study was conducted under GLP equivalent conditions.

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:

Sample taken 2014-06-05 in the plant

Key result

Percentile:

D50

Mean:

ca. 2.142 mm

Remarks on result:

not determinable

Remarks:

standard deviation

No.:

#1

Size:

< 0.16 mm

Distribution:

0.1 %

No.:

#2

Size:

< 0.315 mm

Distribution:

0.1 %

No.:

#3

Size:

< 0.5 mm

Distribution:

0.2 %

No.:

#4

Size:

< 1 mm

Distribution:

1.4 %

No.:

#5

Size:

< 1.7 mm

Distribution:

23.4 %

No.:

#6

Size:

< 2.5 mm

Distribution:

71.5 %

No.:

#7

Size:

< 3.55 mm

Distribution:

99.2 %

No.:

#8

Size:

> 3.55 mm

Distribution:

100 %

Mesh size [mm]	Residues Rx  [%]	Sum of residues R∑x [mm]
0.160	0.1	0.1
0.315	< 0.1	0.1
0.500	0.1	0.2
1.000	1.2	1.4
1.700	22.0	23.4
2.500	48.1	71.5
3.500	27.7	99.2
>3.500	0.8	100

 

Ma = 1.700 mm

Mb = 2.500 mm

Ra = 23.4 %

Rb = 71.5 %

 

Median = 2.142 mm

Conclusions:

The mass median diameter of PERLKA was determined to be 2.142 mm.

Executive summary:

A study was conducted equivalent to CIPAC MT 170. The mass mean diameter of the test item was determined using dry sieve analysis. Therefore the about 80 g of the test item PERLKA was partitioned using a sample splitter. After the defined sieving time the residues on each sieve was determined and the mass median diameter was calculated to be 2.142 mm.

Description of key information

The mass median diameter of Calcium cyanamide, technical grade (Kalkstickstoff)

was determined to be 40 µm as measured by dry sieve analysis.
The mass median diameter of PERLKA (Formulation of Calcium cyanamide) was determined to be 2.142 mm as measured by dry sieve analysis.

Additional information

Calcium cyanamide, technical grade

The mass mean diameter of the registered substance was determined using dry sieve analysis. Therefore about 80 g of the test item was partitioned using a sample splitter. After the defined sieving time the residues on each sieve was determined and the mass median diameter was calculated to be 40 µm.

 

 

Calcium cyanamide, PERLKA formulation

A study was conducted equivalent to CIPAC MT 170. The mass mean diameter of the test item (Fromulation with calcium cyanamide technical grade) was determined using dry sieve analysis. Therefore the about 80 g of the test item PERLKA was partitioned using a sample splitter. After the defined sieving time the residues on each sieve was determined and the mass median diameter was calculated to be 2.142 mm.

 

 

Conclusion

In a technical process the powder calcium cyanamide will be formulated into commercial product PERLKA. Due to this formulation process the particle size of calcium cyanamide will changed. The form of the substance changed from powder to granulate. It was shown that in the commercial product PERLKA the mass median diameter is greater than in the technical product calcium cyanamide. Thus, for industrial application the particle size of calcium cyanamide, technical grade (Kalkstickstoff) and for professional and consumer application the particle size of PERLKA will be used in risk assessment.