1. Glass Candle Vessel Annealing & Thermal Shock QC Parameters (70 g to 1,500 g Multi-Wick)
| Safety Metric | Test Standard | Vella Mandatory Specification | Hazard Prevented |
|---|---|---|---|
| Annealing Lehr Residual Stress | ASTM C148 Polariscope | Apparent Tempering Grade 1–2 (Optical Retardation ≤ 22.8 nm/cm) | Prevents spontaneous cracking during hot wax pouring or cold transit |
| Thermal Shock Resistance (ΔT) | ASTM F2179 / BS EN 12875 | Sudden immersion from +75°C hot bath to +25°C water (ΔT ≥ 50°C · 0% breakage) | Prevents vessel shattering when wick flame nears the bottom 12 mm |
| Minimum Side-Wall & Base Thickness | Ultrasonic Caliper | Side wall: ≥ 3.2 mm · Heavy sham base: 8.0–15.0 mm · Rim concentricity ≤ 1.0 mm | Eliminates thin-spot "hot spots" and ensures stable wick centering |
| Interior & Exterior Coating Heat Rating | ASTM F2417 Fire Safety | Water-based inorganic interior/exterior spray rated to 180°C (Zero flash-over) | Prevents flammable solvent-paint ignition on inner candle rims |
Request Physical Bottling & Pump Compatibility Sample Kit + 24h Tiered FOB Quote (48h DHL Dispatch)
Managed directly by Alex Gao (Managing Director, Vella · Guangzhou Yanchuang Packaging Co., Ltd. · USCC 91440111MA59DBE04B · [email protected] · WhatsApp +86 139 2512 2895). Low trial MOQs (~500–1,000 pcs stock, ~2,000–3,000 pcs custom Pantone with cross-component ΔE <= 1.5), -0.08 MPa vacuum leak testing, and 30/40/30 100% client mould ownership.