FAI and PPAP for China-Built Injection Molds: What Buyers Must Demand

A failed FAI PPAP China injection mold submission costs US OEMs an average of 8 to 14 weeks of rework time and between $22,000 and $75,000 in expedite fees, resampling costs, and production delays. Most of those failures trace back to one root cause: buyers accepted a mold without demanding the right documentation package before shipment. This guide tells you exactly what to require and which standards back it up.

FAI vs. PPAP: Two Frameworks, One Goal

First Article Inspection and PPAP are related but not the same thing. FAI is a physical verification event. PPAP is a documentation submission process. You need both, and confusing them is how costly gaps appear.

FAI is governed by AS9102 Revision B, which defines three forms: Form 1 covers the design documentation accountability, Form 2 covers the product accountability, and Form 3 covers the manufacturing process accountability. AS9102 is aerospace-native but has become the de facto technical reference for first article inspection China mold programs across automotive, medical, and industrial sectors because it is the most complete public specification available. AIAG’s PPAP 4th Edition governs the submission package itself, defining 18 elements from design records through part submission warrants.

For China-sourced molds specifically, most of the 18 AIAG PPAP elements require additional supporting data because the manufacturing site is outside direct audit reach. A domestic tool shop 40 miles from your plant carries implicit trust. A shop in Shenzhen or Ningbo does not, and your customer does not care which continent the mold came from when the part fails a dimensional check.

What a Complete China Mold FAI Report Must Contain

A china mold fai report that passes first review at a Tier 1 or OEM quality gate contains eight core sections. A report missing any one of them will be bounced. We have reviewed hundreds of supplier-submitted packages in our project management workflow, and incomplete balloon drawings and missing Cpk data are the two most common rejection triggers.

• Ballooned drawing: Every characteristic on the engineering drawing numbered sequentially, cross-referenced to the measurement data table. ASME Y14.5-2018 governs GD&T callouts. No balloon, no approval.
• Dimensional layout: 100% of drawing dimensions measured on a minimum of 5 piece samples per cavity. Results reported as actual value, nominal, and deviation. This is covered in AIAG PPAP 4th Edition Section 4.2.3.
• Material certifications: Mill certs for the mold steel (P20, H13, S7, 420SS) and resin lot certs for the sample parts, showing ASTM or ISO material designation, heat number, and mechanical properties test results.
• Process capability study: Cpk of 1.67 minimum for critical dimensions per AIAG PPAP prior to Level 3 submission. A Cpk of 1.33 is the floor for non-critical characteristics. Any feature below 1.33 requires a deviation or corrective action.
• Appearance approval report (AAR): Required for any visible surface, per AIAG PPAP Section 4.2.14. Include digital photos of texture samples against Mold-Tech or Yick Sang standards if applicable.
• Part submission warrant (PSW): Signed by the supplier’s authorized representative, referencing the specific drawing revision, cavity count, press tonnage, and shot weight.
• Control plan and PFMEA: These are process documents, not mold documents, but AIAG PPAP requires them and your China mold supplier must produce them for the molding process used during sampling.
• Measurement system analysis (MSA): Gage R&R study on any in-process gauges. Per AIAG MSA 4th Edition, total gage variation should be below 10% of part tolerance for critical features.

The dimensional layout China mold section carries the most weight. A 5-piece minimum is the AIAG floor. We recommend 10 pieces per cavity for any part with tolerances tighter than plus or minus 0.05 mm. That tighter sample gives you a truer picture of process variation before you commit to production.

Mold Steel and Process Parameter Documentation

Your PPAP package for offshore tooling must document the mold itself, not just the parts it produces. This is where most supplier submissions fall short of what a serious quality review demands.

Require your Chinese toolmaker to supply the following mold-specific records as part of the ppap offshore tooling package.

Document	Minimum Standard	Why It Matters
Mold steel cert	Mill cert with hardness (HRC) and heat number	P20 runs 28 to 34 HRC; H13 runs 48 to 52 HRC. Substitutions cause premature wear.
Core and cavity hardness report	Rockwell test at 4 corners and center, per cavity	Confirms heat treat was performed uniformly. Variation over 2 HRC points is a red flag.
Cooling circuit diagram	Dimensioned layout showing line diameter, depth, and flow direction	Required to validate cycle time assumptions. Typical line diameter is 8 to 12 mm for most tools.
Sampling process parameters	Injection speed (mm/s), melt temp (°C), mold temp (°C), hold pressure (bar), cycle time (sec)	Locked parameters for repeatability. Without this record, a second sample at a different facility is a different process.
Ejector pin layout	Dimensioned drawing with pin diameter and land area	Validates no sink or gate blush on ejection. Pin diameter below 2 mm in deep ribs is a common failure point.
Gate type and location record	Gate geometry, land length, and vestige height	ISO 10350-1 specifies test specimen geometry; gate location affects fiber orientation and mechanical properties.

Process parameters at sampling time are legally and contractually significant. If your supplier transfers production to a second press or a second facility, those parameters must be re-validated. State this explicitly in your purchase order terms. Do not assume it.

Dimensional Layout Requirements and Tolerance Bands

The dimensional layout China mold section of your FAI is where part geometry meets the drawing. You need to understand what tolerance bands actually mean in a production context before you accept a report.

For injection molded thermoplastics, shrinkage drives most dimensional deviation. SPI Mold Classification standard (currently maintained by PLASTICS Industry Association) groups tolerances by resin family. Glass-filled nylon 66 shrinks at 0.4% to 0.7% in the flow direction and 0.8% to 1.4% transverse. Unfilled PP shrinks at 1.5% to 2.0%. These are not supplier errors. They are material physics, and your tolerance stack must account for them before the mold is cut.

ISO 20457:2018 specifies molding tolerances by dimensional range and tolerance grade. Grade MT2 is tightly controlled, suitable for precision medical parts. Grade MT6 is general commercial. Most automotive and industrial components land in MT3 to MT4. If your drawing calls MT2 tolerances on a PP part with a 1.8% shrink, you are setting up a dimensional failure before the first shot.

When reviewing an FAI report, apply these acceptance rules to the dimensional layout data.

• Any feature beyond 100% of its bilateral tolerance band is an outright rejection regardless of Cpk.
• Features with Cpk between 1.33 and 1.67 require a corrective action plan with a defined re-sample date, typically within 30 calendar days.
• Features with Cpk below 1.33 require an approved engineering deviation before any production parts ship.
• Multi-cavity tools must report dimensional data per cavity, not averaged across cavities. Cavity-to-cavity variation above 0.03 mm on critical features is grounds for mold rework.

Draft angle compliance belongs in the FAI too. Most exterior walls require 1 to 3 degrees of draft per side. Textured surfaces per Mold-Tech standards require a minimum of 1.5 degrees per 0.025 mm of texture depth. Confirm draft via CMM or optical scan data, not just visual inspection.

Building Your Supplier Submission Requirements Template

The most effective quality control lever you have for a first article inspection China mold program is the document you send before the purchase order is signed. We call this the Supplier Quality Requirements (SQR) document. It becomes an exhibit to the contract and eliminates “we didn’t know you wanted that” conversations at approval time.

Your SQR for China injection mold programs should include the following requirements stated as pass/fail gates, not suggestions.

• PPAP Level 3 submission required prior to any production release. AIAG PPAP 4th Edition defines Level 3 as full documentation submitted to the customer.
• FAI per AS9102B Form 1, 2, and 3 or equivalent, with balloon drawing cross-referenced to CMM report.
• CMM data generated on a calibrated coordinate measuring machine with a current calibration certificate traceable to NIST. CMM accuracy must be at minimum 4:1 better than the tightest part tolerance being measured.
• Steel certs provided for all mold plates, cores, and cavities at time of FAI submission, not after approval.
• Cpk minimum 1.67 on all critical characteristics (CTQ) and 1.33 on all non-critical characteristics prior to PSW signature.
• Sample parts must be produced on the production mold, in the production resin lot, on a press within plus or minus 20% of the production clamp tonnage. No prototype tooling samples accepted.
• All documentation in English or with certified English translation. Chinese-only reports will be returned without review.
• Resampling fee structure: buyer charges $2,500 per resampling event caused by an incomplete or non-conforming initial submission.

That last line matters. Financial accountability changes supplier behavior. A $2,500 resampling charge is a rounding error compared to the $22,000 minimum cost of a delayed production launch, but it is enough to make a Chinese tooling manager review the package carefully before submitting.

Common Failures in Offshore PPAP Submissions and How to Prevent Them

In our experience managing over 300 offshore tooling programs, the same failure modes appear repeatedly. Knowing them in advance lets you write purchase order language that prevents them.

Failure mode one: generic material certs. A supplier submits a P20 cert that covers an entire steel lot, not the specific plates used in your mold. Require the cert to reference the mold serial number and the specific plate designation (A-plate, B-plate, core insert 1, etc.).

Failure mode two: no per-cavity data. The supplier measures five parts and does not identify which cavity produced each part. This is useless. Require cavity identification marks on all sampled parts and require the CMM report to list cavity number as a column header.

Failure mode three: Cpk calculated from 5 samples. A Cpk study requires a minimum of 30 data points per AIAG Statistical Process Control (SPC) 2nd Edition to produce a statistically valid result. Five parts give you a meaningless number. Require 30-piece short-run capability studies for any CTQ characteristic.

Failure mode four: process parameters recorded after sampling, not during. Suppliers occasionally reconstruct process sheets from memory after the fact. Require time-stamped press monitoring data or a signed process traveler completed during the sampling run.

Failure mode five: functional testing omitted. Dimensional compliance does not guarantee functional performance. If your part snaps together with a mating component, clicks a switch, or seals a fluid path, add functional test results to your FAI checklist. Define the test method in your SQR document and require documented results, not just a verbal pass.

Frequently Asked Questions

What PPAP level should I require for a China-built injection mold?

Require Level 3 for all new molds and for any transferred mold running in a new facility. AIAG PPAP 4th Edition defines Level 3 as full documentation retained at the supplier and submitted to the customer. Levels 1 and 2 are appropriate only for very low-risk commodity parts with proven history, which a new offshore tool is not.

How many sample pieces are required for a valid FAI on a multi-cavity mold?

AS9102B requires a minimum of one conforming part per Form 3. For production validation, AIAG PPAP 4th Edition Section 4.2.3 requires 5 samples minimum for dimensional reporting. Our recommendation for a China mold FAI report is 10 pieces per cavity for tight-tolerance parts, with 30 pieces total for Cpk calculations on CTQ features.

Can I accept a Chinese toolmaker’s internal inspection report instead of a CMM report?

No. Internal inspection reports using handheld calipers or manual gauges are not acceptable for formal FAI PPAP submission on any CTQ dimension. Require a CMM report from a calibrated machine with a current NIST-traceable calibration cert. Some Chinese suppliers have in-house CMM capability. Others must outsource to a third-party metrology lab, and that cost, typically $800 to $2,500 per report, should be included in your tooling quote negotiation.

What steel certifications should I require for a P20 mold?

Require a mill certificate showing the ASTM A681 or DIN 1.2311 designation, the chemical composition by heat number, and the pre-hardened hardness range of 28 to 34 HRC. Require a supplemental hardness test report showing Rockwell readings taken on the actual mold plates after heat treat, not just the mill’s test block. Generic certs covering a warehouse lot are not sufficient.

How do I handle a situation where the supplier submits a PPAP but one feature has a Cpk of 1.10?

Do not sign the PSW. Issue a Supplier Corrective Action Request (SCAR) identifying the non-conforming feature, the actual Cpk, and the required Cpk of 1.33 minimum. Require a root cause analysis using 8D or the 5-Why method within 10 business days, followed by a re-sample of 30 pieces on the corrected process. Only sign the PSW after the re-sample demonstrates Cpk at or above 1.33 on that feature.

Use our injection molding consulting service to have our project managers review your current supplier PPAP packages and identify the gaps before your next tool shipment. You can also download our SQR template from our china tooling services page to start your next offshore mold program with the right documentation requirements in place from day one.