A Buyer's Guide to Platinum Casting Quality
Porosity, shrinkage, and finish: the three checks every sourcing manager should run before approving a platinum casting partner.
By QA Desk
A polished sample can hide an unstable casting process. Buyers evaluating a platinum manufacturing partner need evidence that quality is controlled before finishing begins—and that the same control will hold across repeat orders.
1. Look beneath the surface
Porosity may appear as pinholes during polishing, but its cause often sits upstream in investment preparation, melt control or incomplete feeding. Review unpolished castings, section samples from process validation and ask how defects are categorized and traced.
2. Verify dimensional recovery
Every process changes the nominal CAD dimensions. The important question is whether shrinkage is measured and compensated consistently. Critical stone, clasp and assembly dimensions should be recorded after casting and again after finishing.
3. Read the finish as process evidence
A uniform mirror or satin finish begins with sound metal and controlled geometry. Rounded edges, softened details and visible repair zones can signal that polishing is being used to correct problems rather than complete the design intent.
Questions worth asking
Which dimensions are inspected on every batch?
How are remakes, weld repairs and metal returns documented?
Can the supplier show capability data for a repeat production style?
The best supplier conversation is specific. A partner should be able to connect each visible result to a measured process—and explain how that process is protected as volume grows.
