1) 7 years Professional manufacturer for Molecular Sieve 2) Sphere & Pellet Shape 3) ISO ... sieve will adsorb most molecules with a kinetic diameter of less than 4 angstroms and exclude those larger. Such ... of 1-2 mm, (10x18 mesh) 2-3 mm, (8x12 mesh) , 2.5-5 mm, (4x8 mesh) and as powder, ... and in pellet 1.6, 3.2. AttentionTo avoid damp and pre-adsorption of organic before running, ...