1. Executive Summary & Inspection Scope
In international B2B glassware procurement, defect disputes frequently arise from ambiguous cosmetic vs functional standards. Jingyue Glass implements the ISO 2859-1 (ANSI/ASQ Z1.4) Normal Single Sampling Plan (General Inspection Level II) across all machine-blown and hand-crafted crystal glassware production lines.
Our quality control protocol defines rigorous boundaries across visual, dimensional, thermal, and chemical criteria, ensuring full compliance with US FDA CPG 545.400 / 545.450 food contact safety and EU Regulation (EC) No 1935/2004.
2. Three-Tier Glassware Defect Classification Matrix
Defects are categorized based on consumer safety hazards, brand integrity risks, and structural usability:
Critical Defects (AQL 0.0)
Max Allowed: 0 pcsDefects that pose immediate consumer injury risks or violate mandatory regulatory compliance laws:
- Sharp Burrs & Glass Chipping: Any sharp glass protrusion along the laser-cut rim, stem junction, or base rim.
- Cracks & Fractures: Through-cracks, surface micro-fissures, or deep stress checks in the glass wall.
- Heavy Lead / Cadmium Leaching: Exceeding FDA limits (< 0.5 ppm for drinking vessels).
- Un-annealed Internal Stress: Residual stress exceeding ASTM C148 Temper Grade 3, risking spontaneous thermal bursting.
- Foreign Metal Inclusions: Embedded ferrous particles or sharp refractory debris inside the glass matrix.
Major Defects (AQL 2.5)
Max Allowed: AQL 2.5Functional defects or prominent visual flaws that affect product salability and commercial use:
- Rim Ovality / Out-of-Round: Mouth diameter variance > 0.8mm on stemmed wine glasses.
- Wobble / Rocking Base: Base flatness deviation > 0.5mm causing tabletop instability.
- Dense Bubble Clusters: Concentrated open bubbles (> 1.5mm diameter) located in the primary visual zone (Zone A).
- Heavy Mold Seam Marks: Excessive tactile parting line ridge > 0.15mm along the stem or body.
- Capacity Variance: Fluid volume deviation exceeding ±3% of nominal capacity.
- Logo / Decal Misalignment: Position shift > 2.0mm or decal peeling after 100 industrial wash cycles.
Minor Defects (AQL 4.0)
Max Allowed: AQL 4.0Minor cosmetic blemishes that do not impair structural integrity or primary product usability:
- Isolated Micro-Bubbles: Single isolated closed seeds (< 1.0mm) in lower body (Zone B/C) with > 30mm spacing.
- Faint Chill Lines (Shear Marks): Slight optical cooling waves on heavy base tumblers visible only under angled light.
- Minor Outer Box Scuffs: Non-punctured master carton surface rubbing resulting from transit vibrations.
- Slight Color Tint Variance: Minor batch-to-batch optical clarity difference within ΔE < 1.0 color space.
3. ISO 2859-1 Level II Normal Single Sampling Table (Export Standard)
The standard sampling size and acceptance/rejection (Ac / Re) numbers applied during Final Random Inspection (FRI):
| Batch Order Size (Pcs) | Sample Size (Code Letter) | Critical (AQL 0.0) [Ac / Re] | Major (AQL 2.5) [Ac / Re] | Minor (AQL 4.0) [Ac / Re] |
|---|---|---|---|---|
| 501 – 1,200 pcs | 80 pcs (Letter J) | 0 / 1 | 5 / 6 | 7 / 8 |
| 1,201 – 3,200 pcs | 125 pcs (Letter K) | 0 / 1 | 7 / 8 | 10 / 11 |
| 3,201 – 10,000 pcs | 200 pcs (Letter L) | 0 / 1 | 10 / 11 | 14 / 15 |
| 10,001 – 35,000 pcs (20GP/40HQ) | 315 pcs (Letter M) | 0 / 1 | 14 / 15 | 21 / 22 |
| 35,001 – 150,000 pcs | 500 pcs (Letter N) | 0 / 1 | 21 / 22 | 21 / 22 (Tightened) |
4. In-House Factory QC Testing & Validation SOPs
Every batch passes polariscope birefringence testing to guarantee complete lehr thermal stress relief (ASTM C148 Temper Grade 1–2).
Submerging samples from 60°C hot water directly into 18°C cold water (ΔT ≥ 42°C) with zero fracture or micro-cracking.
Testing laser engraving and 580°C high-temp decal through 500–1,000 commercial wash cycles without fading or clouding.
Full 1-corner, 3-edge, 6-face free fall drop test on finished export master cartons to guarantee zero courier and sea transit breakage.
Factory Audits & Third-Party Inspection Support
Jingyue Glass is fully certified under TÜV Rheinland Factory Audit and supports buyer-nominated third-party inspections (SGS, QIMA, Intertek, Bureau Veritas). We provide dedicated QC inspection rooms, standard D65 lightbox setups, and certified digital micrometers to facilitate smooth pre-shipment sign-offs.