Not only the sputtering targets, semiconductor materials and single crystals, but also the other products.　　

Sapphire (Al₂O₃)

Sapphire(Al2O3) is high in hardness (Moh's hardness 9) while resistancibility to chemical and heat is excellent, it is widely used in various substrates, bearing, prism, optical instruments window, high heat pressure furnace's window for basic research and industrial, commercial fields.

Specification properties

Material	Alminium oxide	Specific gravity	3.99
Formula	Al2O3	Melting point	2050℃
Growth method	CZ, EFG, Cyprus etc.	Moh's hardness	9
Crystal system	Hexagonal	Refractive index (λ=0.6μm)	ne<=1.76 na=1.77
Crystal type	Colundum	Refractive index dispersion	0.018
Cleavage	Unclear	Transmittance wave length	As shown below
Color	Clear	Dielectric constant	C//：12　C⊥：9
Purity	99.99%	Hear expansion coefficient(×10-6℃)	C//：6.7 C⊥：5.0
Lattice index	a=4.758Å c=12.991Å	Orientation	(C-plane)(R-plane) (A-plane)

<For reference purpose only>

Crystal size

2"φ×0.5�o、3"φ×0.5�o、4"φ×0.5�o、10×10×0.5�o
15×15×0.5�o、20×20×0.5�o

Polishing: One side polished, Two sides poished

*Other size is available upon request.

* Luminous transmittance ratio curve