by Welch Materials
LP is abbreviation for Low pH. LP phases are designed for use at low pH condition. LP phase consists of two very bulky hydrophobic protective groups to prevent siloxane bond from hydrolysis at low pH condition. So the LP column is extremely stable in very low pH mobile phase and at high temperature, even at the lowest pH 1.0, making it the most stable C18 for low pH application in the market. Because LP phase is not endcapped and has more surface silanols, LP phase has more retention for some early eluted polar compounds, and provides some different selectivity than traditional C18. LP-C18 is the most polar C18 among all the C18 products of Welch.
| Vendor | Welch Materials | Pore size | 120 |
| Brand | Ultisil LP-C18 | Surface Area | 320 |
| Modifification | Silica/C18 | Carbon Load, % | 10.0 |
| Mode | Reversed-Phase | Endcapped | No |
| Particle Size | pH stability from | 1.0 | |
| Length | pH stability to | 8.0 | |
| Internal Diameter |
| Vendor | Brand | Mode | Modification | Int. diam. | Length | Particles | Pores | Price |
|---|---|---|---|---|---|---|---|---|
| Orochem | Orosil C18 | Reversed-Phase | Silica/C18 | 4.6 mm | 250 mm | 3.0 μm | 100 Å | On request |
| Orochem | Orosym C18 | Reversed-Phase | Silica/C18 | 4.6 mm | 50 mm | 5.0 μm | 130 Å | On request |
| Princeton Chromatography Inc. | PrincetonSPHER C18-ES-100 | Reversed-Phase | Silica/C18 | 4.0 mm | 75 mm | 5.0 μm | 100 Å | On request |
| GL Sciences | Inertsil ODS-4 | Reversed-Phase | Silica/C18 | 3.0 mm | 50 mm | 2.0 μm | 100 Å | On request |
| Teknokroma | Advantix ODS | Reversed-Phase | Silica/C18 | 4.0 mm | 100 mm | 3.0 μm | — | On request |
| KNAUER | Eurospher II | Reversed-Phase | Silica/C18 | 4.0 mm | 250 mm | 5.0 μm | 100 Å | On request |
| SGE Analytical Science | ProteCol C18 G (PEEKsil) | Reversed-Phase | Silica/C18 | 0.3 mm | 50 mm | 5.0 μm | 120 Å | On request |
| LabHut | Cronusil-S ODS-1 | Reversed-Phase | Silica/C18 | 4.0 mm | 150 mm | 3.0 μm | 80 Å | 210.05 |
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