Sapphire Watch Glass Blanks

Sapphire Watch Glass Blanks

Product Overview

Sapphire watch crystal glass blanks are crafted from high-purity synthetic sapphire crystal (α-Al₂O₃), designed for luxury timepieces, precision instruments, and high-end accessories. With exceptional physical properties and optical performance, they are the ideal material for premium watch crystals, combining scratch resistance, high transparency, and corrosion resistance to meet the dual demands of quality and aesthetics in mechanical watchmaking.

Core Advantages

  1. Extreme Hardness, Scratch Resistance

    • Mohs hardness rating of 9 (second only to diamond), effectively resisting daily wear and scratches while maintaining pristine clarity.

    • Nano-level polishing for a smooth surface texture and reduced fingerprint retention.

  2. High Light Transmittance, Uncompromised Clarity

    • Light transmittance ≥92%, comparable to optical glass for distortion-free display of dial details.

    • Optional anti-reflective (AR) coating on both sides to minimize glare and enhance visibility in bright environments.

  3. Durability in Extreme Conditions

    • Temperature resistance: -50°C to 800°C, suitable for harsh climates.

    • Resistant to sweat, seawater, oils, and chemicals, ideal for dive watches and outdoor adventure timepieces.

  4. Precision Engineering, Custom Flexibility

    • Customizable thickness (0.5mm-3.0mm), diameter (10mm-50mm), and shapes (round, square, tonneau, etc.).

    • Pre-machined edges (beveled or curved) for simplified assembly.

Technical Specifications

Parameter Specification
Material Composition Synthetic sapphire crystal (purity ≥99.99%)
Density 3.98-4.01 g/cm³
Refractive Index 1.76-1.78 (@589nm wavelength)
Surface Roughness Ra≤0.01μm (post-polishing)
Thermal Expansion 5.3×10⁻⁶/K (20-300℃)
Dielectric Strength ≥35 kV/mm
Thickness Tolerance ±0.02mm
Diameter Tolerance ±0.05mm (custom sizes negotiable)

Applications

  • Luxury Watches: Mechanical, dive, aviation, and tourbillon watches.

  • High-End Accessories: Pocket watches, cufflinks, decorative lenses.

  • Industrial Instruments: Precision gauge windows, sensor covers.

Production & Quality Assurance

  1. Crystal Growth Technology
    Advanced Kyropoulos (KY) melt growth process ensures bubble-free, impurity-free, and homogeneous crystal structure.

  2. Precision Machining
    Diamond wire cutting and CNC machining achieve micron-level accuracy with chip-free edges.

  3. Rigorous Testing

    • Transmittance: Full-spectrum spectrophotometer testing.

    • Hardness: Batch sampling with Mohs hardness testers.

    • Surface Flatness: Laser interferometry (wavefront distortion <λ/4).

    • Compliant with ISO 6425 (dive watch standards) and Swiss NIHS horology norms.

Collaboration & Services

We offer:
✅ Small-Batch Customization: Rapid prototyping (5-7 business days).
✅ Surface Treatments: AR coating, anti-glare, anti-fingerprint options.
✅ Global Logistics: Shock-resistant packaging for damage-free delivery.

Contact Us
For technical documentation or customization inquiries, email muyonder@gmail.com. Sapphire glass blanks – where engineering excellence meets timeless craftsmanship!

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