3A,4A,5A,carbon molecular sieve as catalyst for air separation industry 1.Beads 4*8mesh 8*12mesh ... inch 3A,4A,5A,carbon molecular sieve as catalyst for air separation industryMolecular Sieve 3A is an alkali metal alumina ... . Type 3A has an effective pore opening of about 3 angstroms (0.3nm). This is large enough to allow ... available in beads of 1-2 mm, (10x18 mesh) 2-3 mm, (8x12 mesh) , 2.5-5 mm, (4x8 ...