Ultra high purity silica
every packed column supplied with:
lot certificate on physicochemical properties of bare silica, minimal metal traces, bonding and chromatographic performance
test chromatogram showing high performance plate count together with tight specification on peak symmetry
ProC18 ProC8 ProC4 ProC18RS Hydrosphere C18
Particle size / µm
2**;3;5
3;5
3;5
3;5
2**;3;5
Pore size / nm
12
12
12
8
12
Surface area / m2 g-1
340
340
340
510
340
Carbon content / %
16
10
7
22
12
Recommended pH range
2-8
2-7.5
2-7.5
1-10***
2-8
Specification metal content Actual*
Actual*
Actual*
Actual*
Actual*
Al (ppm) < 10
0.3
0.2
0.6
0.3
0.7
Fe (ppm) < 10
2.8
2.5
2.9
0.1
1.2
Na (ppm) < 10
0.3
1.4
1.0
1.3
0.7
Ti (ppm) < 10
0.1
0.1
0.1
0.1
0.1
*randomly selected lots
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