Debid

Hardness Conversion

August 7th, 2008

These values are considered to be only a rough approximation.

August 6th, 2008

Sieve through which 99.9% must pass	Max % of Oversize		Min % Retained		Max % Through		Max of 2% Through	FEPA Size No.
(µm)	%	(µm)	%	(µm)	%	(µm)	(µm)

600	8	455	90	360	8	360	255	D426

500	8	384	90	302	8	302	213	D356

455	8	322	90	255	8	255	181	D301

384	9	271	90	213	8	213	151	D251

322	9	227	90	181	8	181	127	D213

271	10	197	87	151	10	151	107	D181

227	10	165	87	127	10	127	90	D151

197	10	139	87	107	10	107	75	D126

165	11	116	87	90	11	90	65	D107

139	11	97	85	75	11	75	57	D91

116	11	85	85	65	11	65	49	D76

97	11	75	85	57	11	57	41	D64

85	15	65	80	49	15	49	-	D54

75	15	57	80	41	15	41	-	D46

August 6th, 2008

18 US Mesh defined as 1000 µm screen aperture

Sieve Size No. (US Mesh)	Theoretical Sieve Opening (µm)	Sieve Opening ASTME II (µm)	FEPA Size No.
18	1000	1000
			D1001
20	841	850
			D851
25	707	710
			D711
30	595	600
			D601
35	500	500
			D501
40	420	425
			D426
45	354	355
			D356
50	297	300
			D301
60	250	250
			D251
70	210	212
			D213
80	177	180
			D181
100	149	150
			D151
120	125	125
			D126
140	105	106
			D107
170	88	90
			D91
200	74	75
			D76
230	63	63
			D64
270	53	53
			D54
325	44	45
			D46
400	37	38
			D39
500		32
			D33
600		25