Introduction: a kind of alkali aluminosilicate and able to adsorb molecules with their critical diameters no more than 5A . Applications:     a) Used for separating normal paraffin from branched hydrocarbon and cricoid hydrocarbons through selective adsorption     b) Widely used for the separation of normal paraffin and isoparaffin     c) Molecules can be adsorbed by molecular sieve 3A , and 4A could be adsorbed by the molecular sieve 5A d) N 2 -O 2 separate, N 2 -H 2 separate Formula: 3/4 CaO·1/4Na 2 O·Al 2 O 3 ·2SiO 2 ·9/2H 2 O Specification: Item unit target Shape   pellet ball Diameter mm 1.5-1.7 3.0-3.3 1.7-2.5 3.0-5.0 Bulk density g/ml ≥ 0.72 ≥ 0.72 ≥ 0.75 ≥ 0.72 Abrasion rate % ≤ 0.25 ≤ 0.25 ≤ 0.25 ≤ 0.25 Crushing strength N/p ≥ 30 ≥ 45 ≥ 60 ≥ 70 C 4 H 10 capacity ml/g 9.4 9.4 9.4 9.4 Water adsorption % ≥ 20.5 ≥ 20.5 ≥ 20.5 ≥ 20.5 Packing water % ≤ 1.5 ≤ 1.5 ≤ 1.5 ≤ 1.5 Packing:  By carton box, each box 30kg or 25kg , inside airtight bag. Or 40kg /sealed iron drum, inside airtight bag.