Applications
Sapphire’s exceptional hardness (Mohs 9), optical transparency, chemical inertness, and thermal stability make it the material of choice in demanding applications across multiple industries. Zhongding Optical supplies precision sapphire components to engineers and procurement teams in the following sectors.
Sapphire Watch Components
Our foundational market. Zhongding Optical has supplied precision sapphire watch components to premium and luxury watch brands for over 15 years, with annual output exceeding 5 million pieces. We manufacture:
- Watch crystals (mineral glass faces) — round, tonneau, cushion, freeform; AR coating optional
- Sapphire bezels — high-precision ring components, tolerance ±0.01 mm
- Sapphire dials — polished or satin-finished; silk-printed scale markings
- Case back windows — exhibition backs for movement display
- Crown guards & pushers — complex 3D CNC-machined components
ISO 9001 · REACH · RoHS · NDA available
Medical-Grade Sapphire Components
Sapphire’s biocompatibility, chemical resistance, and ability to transmit UV and IR wavelengths make it essential in medical and aesthetic laser equipment. We supply:
- Laser transmission windows — 808 nm, 980 nm, 1064 nm wavelength ranges; AR-coated
- Treatment-head contact plates — skin-contact sapphire tips for hair removal and skin rejuvenation devices
- Fibre-optic end caps — polished sapphire rod tips for laser delivery fibres
- Flow-cell windows — chemical-resistant optical windows for diagnostic instruments
Transmission >85% @ target wavelength · Surface quality 20-10 S/D · AR coating R<0.5%
Sapphire Substrates & Wafers
Sapphire is the dominant substrate for GaN-based LED epitaxy and power electronics. We supply polished substrates to semiconductor fabs and research institutions:
- Polished sapphire substrates — 2″, 4″, 6″ diameter; C-plane, R-plane, A-plane orientations
- Epi-ready wafers — double-side polished, RMS roughness <0.2 nm
- Patterned sapphire substrates (PSS) — nano/micro-patterned for LED light extraction improvement
- Optical-grade windows — used in semiconductor process equipment viewports
Orientation accuracy ±0.1° · Bow <10 μm · TTV <5 μm · Epi-ready surface
IR-Transparent Optical Windows
Sapphire transmits from 0.15 μm (UV) to ~5.5 μm (mid-IR), making it ideal for sensor windows, IR cameras, and scientific instruments operating across a broad spectral range:
- IR sensor windows — for gas analysers, environmental monitoring sensors
- Thermal imaging protective lenses — ruggedised sapphire covers for thermal cameras
- High-pressure viewports — rated sapphire windows for process vessel monitoring
- Scientific instrument windows — spectroscopy cells, vacuum chamber viewports
Transmission 0.2–5.0 μm · Hardness 9 Mohs · Max operating temp 1800°C
Sapphire Cover Glass & Wearable Components
The growing demand for scratch-resistant, premium-feel consumer devices drives increasing use of sapphire in smartphones, smartwatches, and wearables:
- Smartphone camera lens protectors — rear camera sapphire cover glass
- Smartwatch cover glass — OEM supply for device manufacturers
- Smart ring shells — complete sapphire ring body machining for health-tracking wearables
- HUD optical windows — AR glasses and head-up display optical elements
- Biometric sensor covers — fingerprint, heart-rate sensor protective windows
High-Reliability Sapphire Components
In environments where glass fails — extreme temperature, abrasion, chemical attack, or vacuum — sapphire performs. We supply ruggedised components for demanding industrial and aerospace applications:
- Missile dome windows and EO sensor covers — precision-ground hemispherical and flat geometries
- Flow meter windows — chemically inert sapphire windows for corrosive media
- Bearing components — sapphire balls and rods for low-friction precision applications
- High-temperature viewports — furnace and reactor observation windows to 1600°C
Export-controlled items require end-user certification. Please confirm application details at inquiry stage.
Sapphire’s unique property profile finds new applications every year. Send us your requirement — our engineers will assess feasibility and provide a quotation within 24 hours.