PARTICLE SIZE CONVERSION
U.S. Sieve Number	Tyler Equivalent Mesh	Mils .001"	Microns .001mm
-	-	0.04	1
-	-	0.19	5
-	-	0.39	10
-	800	0.59	15
635	-	0.79	20
500	500	0.98	25
450	-	1.26	32
400	400	1.50	38.1
325	325	1.75	44.5
270	270	2.10	53.3
230	250	2.50	63.5
200	200	2.90	73.7
170	170	3.50	88.9
140	150	4.13	105.0
120	115	4.93	125.0
100	100	5.87	149.0
80	80	6.97	177.0
70	65	7.87	200.0
60	60	9.84	250.0
50	48	11.70	297.0
45	42	13.94	354.0
40	35	16.54	420.0
35	32	19.69	500.0
30	28	23.43	595.0
25	24	27.83	707.0
20	20	33.11	841.0
18	16	39.37	1000.0
16	14	46.85	1190.0
14	12	55.51	1410.0
12	10	66.14	1680.0