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| High CTE, excellent brightness—ideal for crackle and special-effect glazes. | |||||||||
Initial Melting Point: 850°C
Applicable Temperature: 1000°C–1180°C
CTE: 380
High CTE, excellent brightness—ideal for crackle and special-effect glazes. Glaze surface features intentional aged textures to avoid industrial sterility. Significantly higher CTE than the body causes intense shrinkage during cooling, naturally forming artistic cracks (craquelure, ice-flower patterns) for vintage appeal.
Crackle Ceramic Glaze creates distinctive networked cracks through controlled thermal expansion mismatch: its coefficient of thermal expansion (CTE) is 15-20% higher than standard ceramic bodies. Its formula includes 16.95% calcium carbonate (adjusts CTE to create cracks) and 67.80% nepheline syenite (enhances glaze gloss and adhesion), fired at 1235-1250°C for 14 minutes. Post-firing, ink treatment (oil-based or water-based inks) penetrates the cracks to enhance contrast—black ink creates a classic “ancient porcelain” look, while gold ink adds luxury for high-end decor. The glaze’s crack pattern is repeatable within ±10% for industrial production, ensuring consistent aesthetics across batches.
Artistic Versatility: Crack size and density are controllable via firing temperature—1235°C produces fine hairline cracks (0.1-0.2mm width), while 1250°C creates bold veins (0.5-1mm width). For custom patterns, adjust the glaze layer thickness: 0.3mm for sparse cracks, 0.5mm for dense networks.
Structural Integrity: Cracks are purely cosmetic (depth <0.1mm) and do not penetrate the ceramic body—tests show the glaze maintains 90% of the tile’s original compressive strength (≥20MPa for porcelain) even after 1000+ thermal cycles (-20°C to 60°C).
Customizable Aesthetics: Ink staining options include black, brown, gold, silver, and copper—water-based inks are eco-friendly (VOC <50ppm) and easy to remove, while oil-based inks offer permanent color (resistant to 500+ washes). For a “natural” look, skip ink and let the clay body’s color show through the cracks.
High-Fire Durability: It withstands cone 8-14 firing (1200-1300°C), making it compatible with high-fire stoneware and porcelain. Unlike low-fire crackle glazes, it does not fade or lose crack definition after prolonged use or exposure to sunlight.
Ideal for decorative vases, wall art (mural tiles), accent tiles (kitchen backsplashes, fireplace surrounds), and artisanal pottery (teapots, vases). Popular in rustic, minimalist, and oriental (e.g., Song Dynasty-style) design themes. Apply 2-3 thin coats (total thickness: 0.3-0.5mm) and fire slowly: heat at 50°C/h to 800°C, hold for 30 minutes to remove moisture, then increase to 80°C/h to final temperature (1235-1250°C). After firing, apply ink within 24 hours (glaze is most porous when fresh); wipe excess ink with a damp cloth after 10 minutes.
Q: Will cracks worsen over time?
A: No—once fired, the glaze stabilizes permanently. Avoid sudden temperature changes (e.g., placing a hot vase on a cold surface) with a temperature difference exceeding 80°C, as this may cause new micro-cracks. For functional items (e.g., teapots), use a heat-resistant ceramic body (e.g., high-alumina porcelain) to further reduce risk.
Q: Can ink be removed if needed?
A: Yes—for water-based ink, rinse with warm water (40-50°C) and mild soap immediately after application. For cured oil-based ink (dried >24 hours), use a mild acid (e.g., 5% citric acid solution) and a soft sponge—soak for 30 minutes, then scrub gently. Avoid harsh chemicals (e.g., acetone), as they may damage the glaze surface.
Q: Is it waterproof?
A: Yes, the underlying ceramic body remains sealed—cracks only affect the glaze’s surface layer, not its water resistance. Tests show it holds water for 72 hours without leakage (per GB/T 4100-2015 ceramic tile water absorption standard). For outdoor use (e.g., garden vases), apply a clear waterproof sealant (ceramic-specific) over the inked glaze to prevent ink fading from rain.
| Serial Number | Ingredient Name | Content (%) | Serial Number | Ingredient Name | Content (%) |
| 1 | LOSS(700℃) | <0.05 | 15 | Li2O | <0.01 |
| 2 | Al2O3 | 4.33 | 16 | PbO | <0.01 |
| 3 | SiO2 | 50.57 | 17 | ZnO | 0.43 |
| 4 | Fe2O3 | 0.09 | 18 | SrO | 0.08 |
| 5 | CaO | 10.30 | 19 | MnO | <0.01 |
| 6 | MgO | 0.69 | 20 | Rb2O | <0.01 |
| 7 | K2O | 1.26 | 21 | Cs2O | <0.01 |
| 8 | Na2O | 19.43 | 22 | CdO | <0.01 |
| 9 | TiO2 | <0.01 | 23 | P2O5 | <0.05 |
| 10 | Zr(Hf)O2 | 0.06 | 24 | F | <0.05 |
| 11 | B2O3 | 8.22 | 25 | SO3 | 0.27 |
| 12 | BaO | 3.92 | 26 | NiO | <0.01 |
| 13 | CuO | <0.01 | 27 | Cr2O3 | <0.01 |
| 14 | CoO | <0.01 | 28 | CeO2 | 0.25 |
