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Particle size distribution (Granulometry)

Administrative data

Endpoint:

particle size distribution (granulometry)

Type of information:

experimental study

Adequacy of study:

key study

Study period:

02 Apr 2019

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Cross-reference

Reason / purpose for cross-reference:

reference to same study

Reference

Endpoint:

particle size distribution (granulometry)

Type of information:

experimental study

Adequacy of study:

other information

Study period:

02 Apr 2019

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

test procedure in accordance with generally accepted scientific standards and described in sufficient detail

Reason / purpose for cross-reference:

reference to same study

Qualifier:

no guideline followed

Principles of method if other than guideline:

Determination of the specific surface area by BET

GLP compliance:

no

Type of method:

other: Brunauer, Emmet and Teller (BET) method for determination of surface area

The result of specific surface area were as follows:

Mass of dried cell (g): 10.4974

Mass of dried cell and test item after degassed (g): 10.9096

Mass of degassed test item (g): 0.4122

C constant: 64.5047

Specific surface area of test item (m²/g): 15

 

 

Conclusion

Specific surface area of the fibre in batch No. 15-11-519 was determined to be 15 m²/g.

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2019

Report date:

2019

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

OECD Guideline 110 (Particle Size Distribution / Fibre Length and Diameter Distributions) - Method B: Fibre Length and Diameter Distributions

Deviations:

no

GLP compliance:

no

Type of method:

determination of fibre length and diameter distributions

Remarks:

by scanning electron microscopy (SEM)

Test material

Test material information

Constituent 1

Reference substance name:

Vapour grown graphitic carbon fibre

Molecular formula:

C

IUPAC Name:

Vapour grown graphitic carbon fibre

Results and discussion

Particle size

Remarks on result:

other: see "Any other information on results incl. tables"

Any other information on results incl. tables

The average of fibre length, diameter and aspect ratio (length/diameter) of the fibre in the test item (Batch No. 15-11-519) is shown in the following table:

 

	Fibre length	Fibre diameter			Average of aspect ratio
	Average	Average	D50	≤100 nm
	[µm]	[nm]	[nm]	[%]	[-]
Average	5.2	148	143	18.5	35
Range	1.8-20	48-372	-	-	-

 

 

The fibres from 5 production batches, including batch No. 15-11-519, were also observed by SEM. The average and standard deviation of fibre length, diameter and aspect ratio are shown in the following table:

 

		Fibre length	Fibre diameter		Average of aspect ratio
		Average	Average	≤100 nm
		[µm]	[nm]	[%]	[-]
15-09-435		3.7	152	11.0	24
15-11-519		5.2	148	18.5	35
17-01-009		4.7	146	8.0	32
17-01-034		3.8	142	21.5	27
18-02-120		4.0	161	9.0	25
Average of 5 batches	Average	4.3	150	13.6	29
	SD	0.6	7	6.0	5
	Min	3.7	142	8.0	24
	Max	5.2	161	21.5	35

 

 

Conclusion

Two hundreds of fibre for batch No. 15-11-519 is measured for its length and diameter. The range and average of fibre length of batch No. 15-11-519 were 1.8 - 20 µm and 5.2 µm, respectively. The range and average of fibre diameter were 48 - 372 nm and 148 nm, respectively. 18.5 % of the particles had a diameter ≤100 nm. The average of the aspect ratio was 35.

The average of 5 production batches for average fibre length, average fibre diameter and average of aspect ratio were 4.3 µm, 150 nm and 29, respectively. In the 5 batches the percentage of particles ≤100 nm ranged from 8.0 % to 21.5 % (13.6 % average).

Applicant's summary and conclusion

Conclusions:

The average fibre length, fibre diameter and aspect ratio were 4.3 µm, 150 nm and 29, respectively. The percentage of particles ≤100 nm ranged from 8.0 % to 21.5 % (13.6 % average).