... , Zeolites and molecular sieves, Silica catalysts, Sodium metasilicate and catalyst,Adhesives and Binders)2. As Accelerated agent, Reinforcing agent, Seepage ... Binder in Foundry Specifications of sodium silicate1) modulus: 2.0~3.5 (according to customers requirements)2) na2o+sio2: 98% min ... 0.12% max. Specifications of sodium metasilicate pentahydrate:1) sio2: 28.5+/-0.7%2) na2o: 28.8+/-0.7%3 ...