fast-drying ludox colloidal silica

fast-drying colloidal silica FS(FS-30) fast-drying colloidal silica is researched by our company and Tsinghua University in 1997. Its specially used for precision casting. Its particles surface is modified by other hydronium to weaken the chemical bond between Si- and -OH. The water can run away more quickly in the course of shell making. It can shorten the time of shell making and improve the efficiency of precision casting. It is recommend by the branch association of CFA. Main technical standards: Designation StandardAppearanceSlight milky transparent to translucentSiO2 (wt%)30.0 31.5%Na2O (wt%)≤0.15%PH (20°C)8.0-9.5Density (20°C,g/cm3)1.20-1.22Viscosity (20°C,mPaS)≤12Particle size (nm)8-20StabilityOne year Remark: 1.The using way is same with common colloidal silica. 2. The life of slurry, the capability of coating and the high-temp strength are similar with common colloidal silica. 3.It only need about 1/3 time of common colloidal silica to dry. 4.The wind in shell making plant is most important. 5.Please park 24 hours before dewaxing. 6.It can replace ethyl orthosilicate, and its high-temp strength is higher. 7.It can replace the mixer of colloidal silica and latex. 8.It doesnt need to change using way. 9.The life of slurry, the capability of coating and the high-temp strength are similar with common colloidal silica. 10.Because its wet strength is higher, its ability to resist dissolve is harder. 11.The wind in shell making plant is most important. About 1/2 time to dry for generic casts. 12.Its rudimental strength is lower, so its easier to clean. 13.Need 24 hours to park before dewaxing. 14.It can replace ethyl orthosilicate, and its high-temp strength is higher. 15.It can replace the mixer of colloidal silica and latex. But it cant be used with latex because of its special capability. 16.It doesnt need to change using way. 17.The life of slurry, the capability of coating and the high-temp strength are similar with common colloidal silica. 18.Because its wet strength is higher, its ability to resist dissolve is harder. 19.The wind in shell making plant is most important. One or two hours are enough to dry for generic casts, when the wind speed is 8m/s in workshop. 20.Its rudimental strength is lower, so its easier to clean. 21.Need 24 hours to park before dewaxing. 22.It can replace ethyl orthosilicate, and its high-temp strength is higher. 23.It can replace the mixer of colloidal silica and latex. But it cant be used with latex because of its special capability. Packing & Storage Colloidal silica is packed in 25kg, 250kg or 1000kgplastic drums. Store the colloidal silica at a temperature between 0 and 50, avoid exposure to the air, and insulate it from the sun. Wash the empty drums as quickly as possible to avoid SiO2 crystalline deposits. If you want to remove the deposition from empty drums, use a 10-percent NaOH solution at 50 60.