Yutai Optics offers Gold, Silver and Aluminum high reflection coatings formed by vacuum deposition. All metallic reflectors can be over-coated with dielectric film of MgF2 or SiO2 in order to prevent oxidation of the metallic surface and provide abrasion resistance.
   Protected gold coatings have the highest reflectance in IR, protected silver is the most efficient in VIS, while protected aluminum is an economical reflector over entire 300nm-IR range. The top layer of dielectric material protects the metallic coatings and makes metallic mirrors durable and stable within long term of operation. 
    Enhanced metallic coatings with greater reflection across the specific spectrum range are available under custom request. The coatings for metallic mirrors are deposited using thermal evaporation and electron evaporation technologies. 1.1mm/2.0mm/3.0mm thick Al plate is in stock from Yutai Optics, we can cut dimension as customers' request, it is fast off-the-shelf delivery.

Specifications:
Material: Fused Silica, H-K9L(BK7), Float Glass
Dimension range: Φ3mm-Φ500mm, 3×3mm-200×200mm
Tolerance: +0.0/-0.1mm
Front Surface Flatness: λ/4
Surface Quality: 60-40
Parallelism: within 3 arcmin
Clear Aperture:  >90%
Back Surface: Fine Ground
Coating: Metallic(Al,Ag,Au) coatings