硅溶胶在成分上主要由二氧化硅、高密度物质、二氧化钠、调剂酸碱度的物质、运动粘料、胶体粒子等组成，这些物质的物理化学参数主要影响精密铸造壳体的强度、涂层的稳定性。
In terms of composition, silica sol is mainly composed of silica, high-density material, sodium dioxide, substances regulating pH, moving adhesive, colloidal particles, etc. the physical and chemical parameters of these substances mainly affect the strength of precision casting shell and the stability of coating.
由于精密铸造厂家很难检测到这些物理和化学参数，在一方面要加强供应商的选择、评价和确认。另一方面，表层和背面应选用不同规格的硅溶胶，表层选用s-830型硅溶胶，背面选用s-1430型硅溶胶。在精密铸造生产中，涂层的制备方法直接影响铸件的质量。
Since it is difficult for precision casting manufacturers to detect these physical and chemical parameters, on the one hand, it is necessary to strengthen the selection, evaluation and confirmation of suppliers. On the other hand, different specifications of silica sol shall be selected for the surface and back, s-830 silica sol for the surface and s-1430 silica sol for the back. In the production of precision casting, the preparation method of coating directly affects the quality of castings.