... quality&best price 3.packing will according to clients request 4.modulus:3.0-3.5 Purpose:Used in ... : ITEMIndexOne Sort 12345Density35.0-37.039.0-41.044.0-46.039.0-41.050.0-52.0Sodium oxide ( ... Na2O),% >7.08.210.29.512.8Silicon dioxide (SiO2),% > 24.626.025.722.129.2Modulus M3.5-3 ... .73.1-3.42.6-2.92.2-2.52.2-2.5Fe ,% <0.02Insolubles In water,% <0.2 Sodium Silicate S3.0-3.5 ...