An alumina ceramic dispensing valve refers to precision alumina wetted components integrated into an adhesive dispensing valve to guide, meter, and shut off fluid flow. These components are custom-made to match the valve’s flow path and sealing interface rather than supplied as a complete dispensing system.
Alumina Ceramic Dispensing Valve Benefits
- Wear resistance in filled media — the ceramic seat or nozzle helps maintain flow in high-filler epoxies and TIMs where metal parts wear.
- Low residue adhesion — a polished alumina bore helps reduce stringing and clog initiation on CA/UV lines.
- Tight sealing — fine lapping and sealing-face concentricity support airtightness and help reduce micro-leaks.
- Thermal stability — low-CTE alumina helps maintain dot size across temperature changes.
- Chemical inertness — alumina resists many aggressive solvents and monomers and helps reduce media contamination.
Properties of Alumina Ceramic Dispensing Valve
| Property | Unit | 96% Al₂O₃ | 99% Al₂O₃ | 99.5% Al₂O₃ | 99.6% Al₂O₃ | 99.7% Al₂O₃ | 99.8% Al₂O₃ | 99.9% Al₂O₃ | 99.99% Al₂O₃ |
| Alumina content | % | 96 | 99 | 99.5 | 99.6 | 99.7 | 99.8 | 99.9 | 99.99 |
| Density | g/cm³ | 3.6-3.75 | 3.83 | 3.89 | 3.91 | 3.92 | 3.93 | 3.94 | 3.98 |
| Color | – | white | Ivory | Ivory | Ivory | Ivory | Ivory | Ivory | Ivory |
| Water absorption | % | 0 | 0 | – | 0 | 0 | 0 | 0 | 0 |
| Young’s modulus (Elastic modulus) | GPa | 300 | 350 | 375 | 356 | 357 | 358 | 359 | 362 |
| Shear modulus | GPa | – | – | 152 | – | – | – | – | – |
| Bulk modulus | GPa | – | – | 228 | – | – | – | – | – |
| Poisson’s ratio | – | – | – | 0.22 | – | – | – | – | – |
| Compressive strength | MPa | 1910 | 2210 | 2500 | 2552 | 2554 | 2556 | 2558 | 2570 |
| Flexural strength | MPa | 260 | 300 | 340 | 345 | 346 | 347 | 348 | 365 |
| Fracture toughness | MPa·m¹ᐟ² | – | – | 4 | – | – | – | – | – |
| Hardness | GPa | 14.5 | 17 | 17 | 23 | 24 | 25 | 26 | 30 |
| Thermal conductivity | W/m·K | 20 | 31 | 31 | 31-33 | 31-33 | 31-33 | 31-35 | 31-35 |
| Thermal shock resistance ΔT | °C | – | – | – | 222 | 223 | 224 | 225 | 228 |
| Maximum use temperature (no load) | °C | 1450 | 1680 | ≤1750 | 1755 | 1760 | 1765 | 1770 | 1800 |
| Coefficient of thermal expansion | 10⁻⁶/°C | 7.6 | 7.6 | 7.6 | 7.6 | 7.5 | 7.5 | 7.4 | 7.4 |
| Volume resistivity | Ω·cm | >1×10¹⁴ | >1×10¹⁴ | >1×10¹⁴ | >1×10¹⁴ | >1×10¹⁴ | >1×10¹⁴ | >1×10¹⁴ | >1×10¹⁴ |
| Dielectric constant (relative permittivity) | – | 9.2 | 9.5 | 9.8 | 9.83 | 9.84 | 9.85 | 9.86 | 9.92 |
| Dielectric strength | kV/mm | 15 | 19 | 16.9 | 23.2 | 23.4 | 23.6 | 23.8 | 24 |
| Dissipation factor (loss factor @ 1 kHz) | – | – | – | 0.0002 | – | – | – | – | – |
Alumina Ceramic Dispensing Valve Specifications
| Item | Size (mm) | Diameter（mm) | Length (mm) | Purity（%） |
| AT-YHL-DJF001 | 5*70 | 5 | 70 | 99 |
| AT-YHL-DJF002 | 23*85 | 23 | 85 | 99 |
| AT-YHL-DJF003 | 25*105 | 25 | 105 | 99 |
| AT-YHL-DJF004 | 30*120 | 30 | 120 | 99 |
| AT-YHL-DJF005 | 40*120 | 40 | 120 | 99 |
| AT-YHL-DJF006 | 50*150 | 50 | 150 | 99 |
| AT-YHL-DJF007 | 80*200 | 80 | 200 | 99 |
| AT-YHL-DJF008 | 100*220 | 100 | 220 | 99 |
Alumina Ceramic Dispensing Valve Packaging
- Packaging: Individually foam-protected and sealed in an anti-static bag.
- Standard carton: Multi-layer impact protection.
