CF8M valve Precision Casting parts lost wax casting silica sol BS MIL

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Precision Casting for valve made of CF8M by investment casting silica process.


Quick Detail:


  • Valve body- Investment casting part manufactured by Winnington with ceramic shell casting process;
  • Casting type: silica sol lost wax process;
  • PED/AD2000 certificated;
  • Chemical composition tested by German spectrometer;
  • X ray test available.



Stainless steel investment castings weight from 10g to 80kg, electro polishing or vibration polishing finish available.
The most common material that Winnington cast:

Stainless Steel (70%)

Carbon Steel

Alloy Steel

CF8 (AISI 304), CF3M (AISI 316L), CF8M (AISI 316), CD4MCu, CD4MCuN,ANC20,1.4408,1.4517, 1.4306, 303,  430, 420, 17-4PH, SCS1

and more

1020,SCS16, SCS14, SCS13, 1.0619, WCB, WCC,S355JR, 1045 , LCC

and more


and more

Investment Casting Process:


  • Wax die making: Our wax tooling is made of Aluminum which is easy for machining and fast for cooling, at the same time, light for handling.
  • Wax injection: Filling the entire mould with molten wax, and let it cool, until a desired wax pattern is shaped and harden.
  • Assemble the wax patterns: The wax patterns are welded to a runner system by a heated metal tool according to a certain pattern cluster(tree) design.
  • Investment: The ceramic mould, known as the investment, is produced by three repeating steps: coating, stuccoing, and hardening. The first step involves dipping the cluster into a slurry of fine refractory material and then letting any excess drain off, so a uniform surface is produced. This fine material is used first to give a smooth surface finish and reproduce fine details. In the second step, the cluster is stuccoed with a coarse ceramic particle, by dipping it into a fluidised barrel, placing it in a rainfall-sander. Finally, the coating is allowed to harden.
  • Dewax: The investment is then allowed to completely dry, which can take 16 to 48 hours. It is then turned upside-down and placed in a autoclave to melt out and/or vaporize the wax.
  • Burnout & preheating: The mold is then subjected to a burnout, which heats the mold to remove any moisture and residual wax, and to sinter the mold. The mold is preheated to allow the metal to stay liquid longer to fill any details and to increase dimensional accuracy.
  • Pouring: The investment mold is then placed cup-upwards into a tub filled with sand and be poured.
  • After treatment: The shell is then hammered, media blasted, vibrated, waterjeted, or chemically dissolved to release the casting. Further actions like weld repairing,grinding, shot blasting,CNC machining, electro plating will be taken to get a final cleaned precision casting part.


Pumps & Valves
Pipe Fittings
Marine and Oil
Power & Energy
Other Mechanical Castings





Maximum Casting Size


Casting weight


Wall thickness

1.5-2mm Min

Casting process type

silica sol lost wax casting


CNC machining, CNC lathe

Surface finish

electro polishing, satin, hand polished, pickled, zinc plating, vibration polishing;


German VDG P690

NDT test

Dye test, X ray test etc


Competitive Advantage:

Winnington One-stop Services
Design Assistance
We assist our customers with concepts, estimating manufacturing costs, manufacturing techniques and material considerations. We are able to participate in upgrading, redesigning, re-evaluating or modernizing existing products to increase performance and/or reduce manufacturing costs.
Material sourcing
We provide material sourcing both oversea and in local market, helping customer to source the most suitable material at its best costs.
Testing and Inspection  
We provide a number of testing and inspection services including ultrasonic inspection, magnetic particle inspection, material hardness and/or material properties testing.
Tool Making
With in house expertise and tool shop, we have the complete engineering team to create molding / tooling necessary for production
Secondary Machining
We are equipped with High-precision CNC lathe/milling center to process the interior and exterior of various types of curved surfaces such as cylinder, cones, contrate, chamfer, bevel edges, screw thread, milling holes and boring holes, while conforming to the JB/T8324.1-96 Standard.
Surface Finishing 
We provide customers with various surface finishing treatments, including mirror polishing, passivation, sand blasting, shot blasting, barrel finishing and vibratory finishing. To meet the growing needs of our customers, special treatments may also be arranged.


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Mr. Sophia Peng
Tel: 86-752-2652780
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Winnington Casting CO.,LTD,
Xikeng Industrial Zone, Huizhou, Guangdong, China (Mainland)
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