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Sieves

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References

Sieves are used to classify powders and granules in production and for analytical purposes. They are specified according to DIN/ISO 565 which is equivalent to ISO 3310-1. The following table, which is based on the USP text, compares the ISO sieves with those mentioned in Ph. Eur. and Japan. The US sieve numbers (mesh) are provided in the table for conversion purposes only.

ISO Nominal Aperture
Principal sizes	Supplementary sizes	Recommended USP sieves	US sieve no. (mesh)	Ph. Eur. sieve no.	Japan sieve no.
11.20mm				11200
5.60mm				5600	3.5
	4.75mm				4
4.00mm		4000	5	4000	4.7
	3.35mm		6		5.5
2.80mm		2800	7	2800	6.5
	2.36mm		8		7.5
2.00mm		2000	10	2000	8.6
	1.7mm		12		10
1.40mm		1400	14	1400	12
	1.18mm		16		14
1.00mm		1000	18	1000	16
	850µm		20		18
710µm		710	25	710	22
	600µm		30		26
500µm		500	35	500	30
	425µm		40		36
355µm		355	45	355	42
	300µm		50		50
250µm		250	60	250	60
	212µm		70		70
180µm		180	80	180	83
	150µm		100		100
125µm		125	120	125	119
	106µm		140		140
90µm		90	170	90	166
	75µm		200		200
63µm		63	230	63	235
	53µm		270		282
45µm		45	325	45	330
	38µm			38	391

References

USP/NF (786) Particle size distribution estimation by analytical sieve testing, USP32/NF27, 307 (2009).

Ph. Eur. 2.1.4 Sieves, Kommentar Ph. Eur. 4.00, 2.1.4 Siebe (2004).

J. Goede, Verarbeitung von Stoffen/Trennen, in E. Nürnberg and P. Surmann (eds.), Hagers Handbuch der Pharmazeutischen Praxis, 5^th ed., vol. 2 Methods, p. 586-587, Springer, Berlin, Heidelberg, New York (1991).

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