Investment Castings (Silica Sol Process)

Silica sol investment casting, also known as the lost-wax process, is the preferred choice for parts that demand high precision and complex shapes. A silica sol binder combined with ceramic shell technology produces near-net-shape parts with smooth surfaces (Ra 3.2 to 6.3 μm) and tight tolerances (CT4 to CT6), reducing the need for costly secondary machining.

With 30 years of experience in silica sol casting, we produce everything from small components to large structural parts, including complex industrial castings with thin walls and intricate internal cavities.

The process follows several main stages: tooling, wax injection, shell building, dewaxing, shell firing, pouring, cooling and shell knockout, cutoff and cleaning, and finishing.

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Silica Sol Castings

Our silica sol castings serve a wide range of applications, including:

  • Valves: fluid valves and solenoid valves
  • Pipe fittings: elbows and connectors
  • Impellers: open and closed impellers
  • Automotive parts: exhaust systems, air-conditioning condenser and heat-exchange components, manifolds, etc.
  • Construction machinery: excavator wear parts and lock components
  • Wax PatternWax Pattern
  • Ceramic ShellCeramic Shell
  • Cast ImpellerCast Impeller
  • Cast GearCast Gear
  • Cast Cover PlateCast Cover Plate
  • Cast ElbowCast Elbow
  • ManifoldManifold
  • FilterFilter
  • Connecting PlateConnecting Plate
Material Options
  • Stainless Steel Grades: 304/304L, 316/316L, 17-4PH, 410, 420
  • Alloy Steel and Carbon Steel Grades: WCB, WCC, 45# Steel, and various low- to medium-alloy steel grades
  • Special Alloys: precipitation-hardening stainless steel, duplex stainless steel, copper alloys (aluminum bronze, tin bronze), and nickel-based alloys
  • Quality Assurance: Equipped with professional spectrometers for material analysis. Each heat of molten metal is fully traceable, and a Material Test Certificate (MTC) is provided with shipment.
Technical Parameters
Weight Range 10g – 100kg
Max Linear Size 1200 mm
Max Diameter 600 mm
Casting Tolerance CT4 - CT6 (ISO 8062)
Surface Roughness Ra 3.2 - 6.3 μm
Min. Wall Thickness 3mm
Processes
  • Raw Material InspectionRaw Material Inspection
  • Tooling Storage AreaTooling Storage Area
  • Wax Pattern InjectionWax Pattern Injection
  • Ceramic Shell MakingCeramic Shell Making
  • Melting and PouringMelting and Pouring
  • Heat TreatmentHeat Treatment
  • Surface TreatmentSurface Treatment
  • Casting InspectionCasting Inspection
  • MachiningMachining
  • Final InspectionFinal Inspection
Why Choose HCPC?
Why Choose Huacheng
  • More than 30 years of manufacturing and export experience, with extensive knowledge of international logistics and industry-specific technical standards.
  • Full support from tooling design and sample development through to high-volume production, precision machining, and surface treatment.
  • A strict ISO 9001 quality management system, backed by CMM (coordinate measuring machine) inspection and non-destructive testing (MT, RT, PT).