Ion Exchange Resin Mesh Size Number to Millimeter (mm) Conversion Table

Chromatography Ion Exchange Resins are often sold based on Mesh Size Number. Here is a table showing the conversion to particle size in microns or millimeters.

Mesh Size / Number	Particle Size (mm)
1250	0.010
625	0.020
550	0.025
400	0.037
325	0.044
270	0.053
230	0.063
200	0.075
170	0.090
140	0.106
120	0.125
100	0.150
80	0.180
70	0.212
60	0.250
50	0.300
45	0.355
40	0.425
35	0.500
30	0.600
25	0.710
20	0.850
18	1.000
16	1.180
14	1.400
12	1.700
10	2.000
8	2.360
6	3.350
4	4.750

Typical Commercial Strengths of Common Acids and Bases Used in HPLC

CHEMICAL NAME	MOLECULAR WEIGHT	MOLES / LITER	GRAMS / LITER	PERCENT by WEIGHT	SPECIFIC GRAVITY
Acetic Acid	60.05	6.27	376	36	1.045
Acetic Acid, Glacial	60.05	17.4	1045	99.5	1.05
Formic Acid	46.02	23.4	1080	90	1.21
Hydrochloric Acid	36.5	11.6	424	36	1.18
Nitric Acid	63.02	15.99	1008	71	1.42
Perchloric Acid	100.5	11.65	1172	70	1.67
Phosphoric Acid	98	14.7	1445	85	1.70
Sulfuric Acid	98.1	18.0	1766	96	1.84
Ammonia (in H20)	17.0	14.8	252	28	0.898
Potassium Hydroxide	56.1	13.5	757	50	1.52
Sodium Hydroxide	40.0	19.1	763	50	1.53

Data obtained from The Merck Index, 11^th edition (1989).