Quality Assurance Program
Every SEMITI batch is tested before customer shipment. Our QA program includes incoming inspection, batch CoA, third-party audits, and complaint resolution.
SEMITI's quality assurance program covers material from production through customer delivery, with verification at multiple stages.
Stage 1: Production QC at supplier
Each tier-1 producer in our supplier network operates internal QC labs with ISO 17025 accreditation. Production batches are tested at the supplier for: - TiO2 content (GB/T 1706 / ISO 591) - Crystal form (X-ray diffraction) - Color (CIE L*a*b* per ASTM E308) - Tinting strength (Reynolds method, ASTM D332) - Oil absorption (ISO 787-5) - Particle size distribution (laser diffraction) - Heavy metals (ICP-OES or ICP-MS) - Loss on ignition, water-soluble matter, pH
Failure to meet supplier internal spec → batch held, retested or reprocessed.
Stage 2: Incoming inspection at consolidation warehouse
Material arriving at our Shanghai or Qingdao consolidation warehouses undergoes incoming inspection. We verify: - Batch CoA matches container labels and SKU - Random sampling for confirmation testing (5–10% of containers) - Visual inspection for damage during transport - Documentation completeness (REACH, FDA, certifications)
Material failing incoming inspection is held; we work with supplier on root cause and replacement.
Stage 3: Pre-shipment verification
Before each customer shipment leaves warehouse: - CoA prepared for shipment, batch-specific - All documentation reviewed against customer's purchase order requirements - Container condition verified - Tamper-evident sealing applied where required
Stage 4: Third-party verification (optional)
Customers can request third-party pre-shipment inspection by SGS, Bureau Veritas, Intertek, or other accredited inspector. Costs typically borne by customer ($500–1500 per inspection). Common for first-time customers or high-value shipments.
Stage 5: Customer-side verification
After delivery, customers conduct their own incoming inspection. We support this with: - Pre-shipment CoA emailed at ship date - Hard copy CoA in document pouch - Recall procedure if customer testing identifies issues - Open communication channel for QC questions
Complaint resolution process:
Quality complaints follow a structured process: 1. Initial complaint received (email or phone) 2. Acknowledgment within 24 hours 3. Information gathering — batch number, customer's test data, sample retention 4. Investigation — supplier-side, our warehouse, possible transport damage 5. Resolution — replacement, credit, or technical recommendation 6. Closure — written confirmation of resolution
Median complaint resolution time: 5–10 working days. For complex technical issues, investigation may extend to 30 days.
Track record:
Complaint rate across the SEMITI customer base runs at approximately 0.3% of shipments (industry average ~0.5–1%). The majority of complaints relate to: - Documentation issues (resolved through doc reissue) - Transport damage (resolved through insurance + replacement) - Specification interpretation differences (resolved through technical discussion)
Genuine off-spec batches are rare given the multi-stage QC program.