Abrasives Sizing System.

Powder Size Specifications of the Federation of European Producers of Abrasive Products (FEPA).	

Grit size	3% max.,
larger than, 
mcm	50% min.,
in size range, 
mcm	94% min.,
larger than, 
mcm		Grit size	3% max.,
larger than, 
mcm	50% min.,
in size range, 
mcm	94% min.,
larger than, 
mcm	
F12	2000	N/A	1400		F120	125	N/A	90	
F14	1700	N/A	1180		F150	106	N/A	63	
F16	1400	N/A	1000		F180	90	N/A	53	
F20	1180	N/A	850		F220	75	50.0-56.0	45	
F24	850	N/A	600		F240	70	42.5-46.5	28	
F30	710	N/A	500		F280	59	35.0-38.0	22	
F36	600	N/A	425		F320	49	27.7-30.7	16.5	
F40	500	N/A	355		F360	40	21.3-24.3	12	
F46	425	N/A	300		F400	32	16.3-18.3	8	
F54	355	N/A	250		F500	25	11.8-13.8	5	
F60	300	N/A	212		F600	19	8.3-10.3	3	
F70	250	N/A	180		F800	14	5.5-7.5	2	
F80	212	N/A	150		F1000	10	3.7-5.3	1	
F90	180	N/A	125		F1200	7	2.5-3.5	1	
F100	150	N/A	106						

FEPA P-Grading System		US Grading System.	
				
P Grade	D50 Size 
In Microns	FEPA Grade
(ref.)		Grade No.	US Standard Micron Range	Mesh Sizes	
P150	100+/-2.0	F180		1/4	0-1/2	60,000	
P180	77+/-2.0	F220		1/2	0-1	25,000	
P220	60+/-2.0	n/a		1	0-2	10,000	
P240	58.5+/-2.0	F220		2	1-3	9,000	
P280	52.5+/-2.0	n/a		3	2-4	8,500	
P320	46.2+/-1.5	F240		4	2-6	6,000	
P360	40.5+/-1.5	F280		6	4-8	3,000	
P400	35.0+/-1.5	n/a		9	6-12	1,800	
P500	30.2+/-1.5	F320		12	8-15	1,500	
P600	25.8+/-1.0	n/a		15	10-20	1,200	
P800	21.8+/-1.0	F360		17	15-20	1,100	
P1000	18.3+/-1.0	F400		20	15-25	1,000	
P1200	15.3+/-1.0	n/a		25	20-30	880	
P1500	12.6+/-1.0	F500		30	22-36	600	
P2000	10.3+/-0.8	F600		35	30-40	500	
P2500	8.4+/-0.5	n/a		45	36-54	450	
				400	35/45	325/400	
Standard Testing Sieve Apertures		320	45/53	270/325	
				240	53/63	230/270	
ASTM Sieve	ASTM Mesh	Nearest Tyler	Tyler Mesh		220	63/75	200/230	
No.	Opening (mm)	Sieve Mesh No.	Opening mm)		180	75/90	170/200	
3	6.35	3	6.68		150	90/106	140/170	
4	4.76	4	4.70		120	106/125	120/140	
6	3.36	6	3.33		110	125/150	100/120	
8	2.38	8	2.36		105	150/180	80/100	
12	1.68	10	1.65		100	180/250	60/80	
16	1.19	14	1.17		60	250/300	50/60	
20	0.84	20	0.83		46	300/425	40/50	
30	0.59	28	0.59					
40	0.42	35	0.42					
50	0.297	48	0.295					
70	0.149	100	0.147					
100	0.105	150	0.104					
200	0.074	200	0.074