... sol casting: 1)Advanced casting process 2)Strict quality control 3)Professional service 4)One stop solution High carbon steel axe(silica sol ... Three type of casting process for choice, silica sol precision casting, compound shell precision casting and ... process according to your technical requirement. Tol. GradeRoughnessMaterialSilica Sol Precision CastingCT4~6Ra3.2~6.4Stainless Steel, Heat resistant ...