Yiwu Yunshuo Zipper Co., Ltd. Quality Control

Total Quality Management Approach
We implement a rigorous 360° quality control system covering every stage from raw materials to finished products, ensuring consistent excellence in all our zippers.

1. Raw Material Control

• Strict supplier qualification system (approved vendor list)

• Incoming inspection with 12 key parameters checked

• Material testing for:

  • Tensile strength (ISO 13934-1 standard)

  • Color fastness (AATCC 16-2014)

  • Chemical compliance (REACH, ROHS, OEKO-TEX)

• Batch tracking system for complete traceability

2. In-Process Quality Checks

• First article inspection for every production run

• 4-stage process verification:

  1. Teeth formation inspection (±0.03mm tolerance)

  2. Tape bonding strength test

  3. Slider functionality check (5000+ cycle test)

  4. Dimensional accuracy verification

• Statistical Process Control (SPC) with real-time monitoring

3. Final Product Inspection

• 100% visual inspection

• AQL 2.5 sampling plan for bulk orders

• 12 functional tests including:

  • Crosswise strength test (ASTM D2061)

  • Salt spray test (72 hours for metal zippers)

  • Wash resistance test (50 cycles)

  • Low temperature flexibility test (-30°C)

• Laser measurement for critical dimensions

4. Laboratory Testing Capabilities

• Fully-equipped in-house lab with:

  • Abrasion tester (Martindale method)

  • Color spectrophotometer

  • Zipper reciprocating tester

  • Environmental test chamber

• Third-party certification support (SGS, ITS, BV)

5. Quality Assurance Certifications

• ISO 9001:2015 certified quality system

• OEKO-TEX Standard 100 certified

• Compliance with international standards:

  • BS 3084 (UK)

  • DIN 3419 (Germany)

  • JIS S3015 (Japan)

6. Continuous Improvement Program

• Monthly quality KPI review

• Customer feedback analysis system

• 8D problem-solving methodology

• Annual worker skill certification program

Our Quality Promise:

• Defect rate <0.3% in outgoing products

• 48-hour response for quality issues

• Comprehensive quality documentation

• Free replacement for non-conforming products

Why Our Quality Stands Out:

• 15 years of defect-free shipments to EU/US markets

• 98.7% customer satisfaction rate in 2023

• Dedicated QA team of 25 professionals

• Investment of 5% annual revenue in quality improvement