You can use Ultra or Roc 5 µm guard cartridges for fully porous particle (FPP) columns with a particle size of 3 µm or greater, provided the packing material is very similar. For “core-shell” or superficially porous particles (SPP), a Raptor 2.7 µm or 5 µm guard can be used for similar phases and particle … Continue reading Can I use a Restek guard cartridge with my column from another vendor?