Guard cartridge for any Shim-pack GIST-HP Amide column with 1.9um particle size and 2.1mm ID. The HP designation indicates stability up to 80 MPa/800 bar/12,000 psi. USP L68, 100A pore size, 350 m2/g surface area, 15% carbon load, fully endcapped, pH range 2-8.5, maximum temperature 80C, maximum pressure 80 Mpa/800 bar/12,000 psi. Includes 227-30533-01 (high pressure holder.) Use 227-30949-01 for replacement cartridges (2/pk.)