Vacuum Coating


In-house PVD and CVD coating systems allow Zhongding Optical to apply precision thin-film coatings directly after polishing — eliminating inter-supplier handling, reducing contamination risk, and cutting lead times. Every coated batch is verified on our UV-Vis-NIR spectrophotometer before shipment.

Coating Technologies

PVD · Physical Vapour Deposition

Evaporation and sputtering-based processes. Ideal for optical thin films, metallic layers, and decorative coatings.

  • Electron-beam evaporation
  • Ion-assisted deposition (IAD)
  • Magnetron sputtering
  • Film thickness control to nanometre level
CVD · Chemical Vapour Deposition

Gas-phase reaction processes for hard coatings, functional films, and high-conformality requirements.

  • DLC (diamond-like carbon) deposition
  • High-hardness protective films
  • Excellent step coverage on 3D geometries
  • Low-temperature PECVD available

Coating Types Available

Coating Function Typical Performance
AR — Anti-Reflection Reduces surface reflection losses, increases transmission R < 0.5% per surface
HR — High Reflection Maximises reflectance at target wavelength R > 99% @ design wavelength
ITO — Conductive Transparent conductive layer for EMI, touch, ESD Sheet resistance 10–200 Ω/□, T >85%
DLC — Diamond-Like Carbon Extreme hardness, low friction, wear protection Hardness ~2000 HV, friction coeff. < 0.1
AF — Anti-Fingerprint Hydrophobic / oleophobic surface Contact angle > 110°
Metallic Decorative Gold, silver, titanium, black tone aesthetics Adhesion per ASTM D3359, salt spray 200h
Custom Multilayer Stack Designed to customer spectral specification Spectrophotometer report included
Coating-only service available:
We accept customer-supplied substrates (sapphire, glass, fused silica, ZnSe) for coating-only orders. Minimum batch size applies — contact us for details.
Request a Coating Quote →

Silk Screen Printing Services

High-precision silk screen printing on sapphire, optical glass, and ceramic substrates. Used for scale markings, brand logos, dials, graduated bezels, and functional indicator patterns on precision optical and industrial components.

Substrates Accepted
  • Sapphire (all grades)
  • Borosilicate glass
  • Fused silica
  • Aluminosilicate glass
  • Alumina ceramic
Ink Types
  • Epoxy-based (standard)
  • UV-cured inks
  • High-temperature ceramic inks
  • Metallic inks (silver, gold)
  • White, black, custom colour
Process Capability
  • Min. line width: 0.1 mm
  • Registration accuracy: ±0.05 mm
  • Multi-colour registration available
  • Adhesion test per DIN 53151
  • High-temp cure (up to 500°C)
Typical applications:
Watch dial hour indices · Graduated bezel markings · Medical device scale bars · Instrument panel legends · Brand logo printing on cover glass
Request a Printing Quote →