PPAP for Plating: What Automotive OEMs Require
The Production Part Approval Process (PPAP) is the gatekeeper of automotive quality. Learn the Level 3 requirements for electroplating and how to prepare your PSW.
In the automotive world, you don’t just “start shipping parts.” You must first prove that your manufacturing process is stable, repeatable, and capable of meeting the design intent. This proof is submitted as a PPAP (Production Part Approval Process).
For a surface finisher, the PPAP is a rigorous documentation package that proves the plating will be identical from part #1 to part #1,000,000.
1. The 18 Elements of PPAP
While a “Level 3” PPAP (the industry standard) requires 18 distinct elements, the most critical for a plater are:
- Design Records: The ballooned drawing showing where the plating is required and what the tolerances are.
- Process Flow Diagram: A step-by-step map of the cleaning, plating, and baking sequence.
- PFMEA (Process Failure Mode and Effects Analysis): A proactive document where the plater identifies everything that could go wrong (e.g., “Acid tank becomes too concentrated”) and what the control plan is to prevent it.
- Control Plan: The actual inspection sheet used by the quality team to check the parts during production.
2. Measurement System Analysis (MSA)
The automotive OEM wants to know if your thickness gauge is accurate. A Gage R&R (Repeatability and Reproducibility) study is required. This proves that three different operators using the same XRF machine will get the same thickness result on the same part.
3. The Dimensional Results
For the PPAP batch (usually 300 pieces), the plater must provide a dimensional report on a sample set (usually 5-10 pieces). For plating, this primarily means:
- Coating Thickness (min/max/average).
- Post-Plate Dimensions (ensuring the plating didn’t make the threads too tight).
- Salt Spray Results (verifying the coating survives the required hours).
4. The PSW (Part Submission Warrant)
The PSW is the final “contract” signed by both the supplier and the customer. Once a PPAP is approved, the plater is forbidden from changing anything—the chemical supplier, the bake oven temperature, or the process sequence—without notifying the customer and re-submitting the PPAP.
At Platinex Industries, we are Level 3 PPAP specialists for the Indian and global automotive supply chain. We provide comprehensive documentation packages that ensure a smooth launch for your high-volume programs. Contact our quality team to initiate your PPAP request.