Quality Control Checklist: Never Pay the Final 70%

# Quality Control (QC) Checklist You wired the 30% deposit to the factory. Thirty days later, the factory boss sends you a WeChat message: *"Great news! Production is finished. Here is a photo of the boxes. Please wire the final 70% balance today so we can load the ship."* If you wire that money, you surrender all of your leverage. > **💡 Withyou Trip Expert Verdict:** > "Never, under any circumstances, pay the final 70% balance before a **Pre-Shipment Inspection (PSI)** has been completed. The factory's photo of a cardboard box tells you nothing. You MUST hire an independent 3rd-party QC inspector (costing ~$300) to physically visit the factory, open the boxes, and test the goods against AQL (Acceptable Quality Limit) standards. If the goods are defective *after* you pay, the factory will never refund you." ## 1. The Manufacturing QC Matrix | Inspection Type | When It Happens | Primary Goal | Verdict | | :--- | :--- | :--- | :--- | | **First Article Inspection** | 10% of goods finished. | Verify the machines are calibrated correctly. | 🟡 Good for complex OEM molds. | | **DPI (During Production)** | 50% of goods finished. | Catch systemic flaws before the whole batch is ruined. | 🟡 Recommended for massive orders. | | **PSI (Pre-Shipment)** | **100% finished, 80% packed.**| Verify quality, packaging, and quantities. | 🟢 **MANDATORY FOR EVERY BUYER.** | | **Container Loading Check** | As the truck is loaded. | Ensure boxes aren't crushed by forklifts. | 🟡 Good for fragile goods (glass). | ## 2. The Golden Sample Rule A QC inspector cannot do their job if they don't know what "perfect" looks like. * **The Trap:** You tell the inspector to "make sure the mugs are good." The inspector says they look fine. You receive them, and they are dark blue instead of light blue. The factory says, "You didn't specify the exact shade." * **The Fix:** Before mass production begins, the factory must send you a physical prototype. You inspect it. If it is perfect, you sign your name on it with a Sharpie. This becomes the **"Golden Sample."** You mail this sample to your QC inspector in China. The inspector will hold the mass-produced mug directly next to the Golden Sample to verify an exact match. ## 3. AQL (Acceptable Quality Limit) Standards In mass manufacturing, 100% perfection is mathematically impossible. AQL is the global standard used to define how many defects are "acceptable." * **The Standard Setup:** Most consumer goods use an AQL level of **0 / 2.5 / 4.0**. * This means: **0** Critical Defects (e.g., exposed electrical wires that can kill someone = instant fail). **2.5%** Major Defects (e.g., severe scratches, product doesn't turn on). **4.0%** Minor Defects (e.g., slight smudge on the cardboard box). * Your QC inspector will pull a statistical sample size (e.g., 200 units out of 5,000) and use this AQL chart to give you a definitive Pass/Fail report. ## ❓ Frequently Asked Questions (FAQ) **Q: Who pays for the QC inspector, me or the factory?** A: **You.** The buyer always pays for the independent QC inspector. If the factory offers to pay for the inspector, refuse immediately. He who pays the inspector controls the report. You want the inspector to be loyal only to you.