During-Production Inspection (DPI) in China
During Production Check (DUPRO) is an essential preventative measure conducted in the early to mid-stages of production. It helps identify and resolve quality issues before too many defective items are manufactured,...
What is During Production Check (DUPRO)?
During Production Check (DUPRO) is an essential preventative measure conducted in the early to mid-stages of production. It helps identify and resolve quality issues before too many defective items are manufactured, minimizing costly rework and avoiding delays in the shipping schedule.
CGF Inspection performs on-site DUPRO inspections when 30% to 50% of production is completed, ensuring consistent quality throughout the manufacturing process. Our inspectors follow ANSI/ASQC Z1.4 (ISO 2859-1) AQL sampling standards and provide detailed reports based on predefined acceptable quality levels.
Key Benefits of During Production Check (DUPRO)
Early Defect Detection
Identifies and corrects issues before mass production, reducing rework costs.
Production Schedule Control
Monitors progress to prevent shipment delays.
Cost Savings
Avoids financial losses from defective batches and returned orders.
Quality Assurance Before Mass Production
Ensures products meet specifications before full production runs.
Higher Customer Satisfaction
Delivers high-quality products on time, improving buyer trust.
When Should You Consider a DUPRO Inspection?
Large-quantity shipments Continuous production lines Strict on-time delivery requirements Follow-up after a failed Initial Production Check (IPC)
A DUPRO inspection is one of the most effective ways to:
Keep suppliers accountable
Ensure on-time shipments
Meet regulatory and quality standards
Guarantee customer satisfaction
What Does CGF Inspection Check During DUPRO?
Our inspectors verify: Production schedule & capacity Product quality, function, and safety Quantity, labeling, and markings Packaging compliance
Why Choose CGF Inspection for DUPRO?
Fast & Detailed Reporting – Receive a full inspection report with photo evidence within 24 hours.
Global Inspector Network – Inspections arranged within 24 hours of request.
AQL-Compliant Sampling – Follows ANSI/ASQC Z1.4 (ISO 2859-1) standards.
Risk Mitigation – Ensures production starts correctly and avoids defects before mass manufacturing.
Contact CGF Inspection today to secure your production quality and schedule!
What We Check
- Early defect detection at 10–50% production output
- Production-line and process-stability review
- Workmanship, materials and key components in process
- Inline functional checks on finished sub-lots
- Corrective-action advice before mass output
When To Book This Service
- Production has reached 10–50% completion
- You need to correct issues before they scale
- For complex products or a first-time supplier
How CGF Conducts It
- We set checkpoints with your factory schedule
- Inspector visits during active production
- Samples are drawn from the live line for checks
- Real-time feedback is shared with you and the factory
- A progress report follows within 24 hours
Why It Matters
- Fix root causes early — avoid costly rework later
- Reduce the defect rate across the whole order
- Keep the shipment on schedule
- Document process control for your records
Industries We Cover
Where We Operate
Zhejiang, Jiangsu, Shanghai, Guangdong (Dongguan / Shenzhen / Foshan / Shunde), Qingdao, Sichuan, Chongqing and across China.
Inspection Standards We Work To
| Standard | What it covers |
|---|---|
| AQL (Acceptance Quality Limit) | Defines the maximum number of defective units acceptable in a random sample — the basis of our sampling plans. |
| ANSI/ASQ Z1.4 | U.S. standard for sampling by attributes (single, double and multiple sampling). |
| ISO 2859-1 | International general standard for sampling by attributes, equivalent to ANSI/ASQ Z1.4. |
| ISO 9001 | Quality management system baseline referenced in our factory audits. |
| IEC / EN / ASTM | Product-specific safety & performance references applied per your specification. |
Every CGF assignment includes
- An independent, on-site inspector working for you — never the factory
- Internationally recognised AQL sampling (ANSI/ASQ Z1.4 · ISO 2859-1)
- On-site photos embedded in every report
- A detailed, bilingual English inspection report within 24 hours of the visit
