A spec sheet is only as honest as the tests behind it. At Yujie Cup, every batch passes documented QC before it ships, so B2B buyers get proof, not promises. This guide lists the factory testing standards you should require on any stainless steel bottle order.
Table of Contents
1. Why QC Standards Matter
A bottle that leaks or sheds coating fails the buyer, not just the brand. Documented testing catches defects before they reach a container. Yujie Cup runs QC inline and per-batch because our name is on the product — see our manufacturing process for where each check sits on the line.
2. Core Factory Tests
| Test | What it proves | Pass target |
|---|---|---|
| Leak test | No seepage at seal & cap | 0 leaks in sample |
| Vacuum retention | Insulation holds | Meets quoted hours |
| Drop test | Shell survives impact | No crack / dent leak |
| Material check | 18/8, food-safe | Cert per batch |
| Coating adhesion | Powder/print stays | No peel in tape test |
Inline inspection catches leaks and coating defects before packing.
3. What to Put in Your PO
Write the numbers into the order so they are contractual. Yujie Cup quotes retention, drop height, and coating standard in the OEM/ODM order and returns per-batch reports. Pair this with our certifications guide so material claims are traceable too.
| Clause | Example |
|---|---|
| Retention | Cold ≥24 h, Hot ≥12 h |
| AQL | 2.5 major / 4.0 minor |
| Report | Per-PO test file |
Per-batch records let buyers trace a result back to their shipment.
Set your QC bar
Tell Yujie Cup the tests and targets you require; we build them into the order and the report.
Frequently Asked Questions
What QC tests should I require?
At minimum: leak, vacuum retention, drop, material (18/8) verification, and coating adhesion. Add salt-spray or dishwasher cycles if your market needs them.
Can QC be written into the contract?
Yes. Yujie Cup quotes retention, drop height, and AQL in the OEM/ODM order, so the targets are contractual and verified per batch rather than assumed.
Do you provide test reports?
Yes. We return a per-PO test file covering the checks in your order, so a result can be traced back to your specific shipment.
What is AQL and why does it matter?
AQL (Acceptance Quality Limit) sets how many defects are allowed in a sample. A tight AQL (e.g. 2.5 major) means fewer bad units reach you; we agree the level in the PO.