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High-Lead Reduction Glaze is an eco-friendly coating with lead content below 0.1mg/L—meeting EU REACH (Regulation (EC) No 1907/2006), GB12651-2003 (Chinese food-contact ceramic standard), and U.S. FDA 21 CFR 178.3100. | |||||||||
| Serial Number | Ingredient Name | Content (%) | Serial Number | Ingredient Name | Content (%) |
| 1 | LOSS(700℃) | <0.05 | 15 | Li2O | 0 |
| 2 | Al2O3 | 0.04 | 16 | PbO | 90.18 |
| 3 | SiO2 | 9.56 | 17 | ZnO | 0 |
| 4 | Fe2O3 | 0 | 18 | SrO | 0 |
| 5 | CaO | 0 | 19 | MnO | 0 |
| 6 | MgO | 0 | 20 | Rb2O | 0 |
| 7 | K2O | 0 | 21 | Cs2O | 0 |
| 8 | Na2O | 0 | 22 | CdO | 0 |
| 9 | TiO2 | 0 | 23 | P2O5 | 0 |
| 10 | Zr(Hf)O2 | 0 | 24 | F | 0 |
| 11 | B2O3 | 0 | 25 | SO3 | 0 |
| 12 | BaO | 0 | 26 | NiO | 0 |
| 13 | CuO | 0 | 27 | Cr2O3 | 0 |
| 14 | CoO | 0 | - | - | - |
It replaces traditional lead oxides (e.g., lead monoxide) with boron-based fluxes (12% zinc borate + 8% boric acid), achieving a 90% lead reduction rate (traditional lead glazes contain ~1.2mg/L lead) while maintaining a glossy finish (glossiness: 75-80). The glaze’s stable chemical structure prevents lead leaching even in acidic environments (e.g., lemon juice, vinegar).
Health Compliance: Eliminates lead leaching risks in food-contact ceramics (e.g., dinnerware, mugs), making it safe for children and pregnant individuals—leaching test results show <0.005mg/L lead in 4% acetic acid (24-hour soak at 22°C)
Regulatory Approval: Passes U.S. FDA food safety tests (21 CFR 178.3100) and EU 10/2011 (food contact materials), enabling export to North America, Europe, and other strict regulatory markets without certification delays
Color Retention: Transition metal colorants (CoO for cobalt blue, Fe₂O₃ for terracotta, CuO for turquoise) maintain 95% color vibrancy after 500+ washes (dishwasher-safe, 60°C cycle) without fading or bleeding
Low Environmental Impact: VOC emissions ≤80ppm during firing (measured via GC-MS), complying with EU ECOLABEL standards; production process reduces heavy metal waste by 80% compared to traditional lead glazes
Perfect for dinnerware (plates, bowls), mugs, children’s ceramics (sippy cups, snack bowls), and decorative tableware. Suitable for both industrial production (continuous kilns) and artisanal pottery (electric or gas kilns). Recommended firing range: 1000-1100°C (cone 06-04) for optimal lead stabilization—fire at a heating rate of 50°C/h to 800°C, then increase to 100°C/h to final temperature. For artisanal use, apply via brushing (natural bristle brushes) or dipping; allow 6-8 hours of air drying before firing to prevent glaze bubbling.
Q: How to test lead content in finished products?
A: Use X-ray fluorescence (XRF) analyzers (e.g., Thermo Scientific Niton XL3t) per GB/T35602-2017 (Chinese standard for heavy metal testing in ceramics). For official certification, send samples to accredited labs (e.g., SGS, Intertek) for inductively coupled plasma mass spectrometry (ICP-MS) testing—this method detects lead levels as low as 0.001mg/L.
Q: Does it work with low-fire clay?
A: Yes, it is formulated for low-fire clay (cone 06-04, 900-1000°C), such as earthenware and terracotta. For low-fire applications, add 3% talc to the glaze to adjust thermal expansion, preventing cracking between the glaze and clay body. Avoid using with high-fire clay (>1150°C), as it may cause over-melting and glaze runoff.
Q: Is it more expensive than traditional lead glazes?
A: It is 15% more expensive upfront, but this cost is offset by long-term savings: it avoids export return rates (common with lead-containing products, which average 20% in strict markets) and reduces compliance costs (no need for lead remediation or re-testing). For high-volume production (100,000+ pieces/year), the total cost difference shrinks to 5% due to economies of scale.
