Composition	MgO
Crystal system	Cubic
Crystal structure	NaCl
Lattice constant	a=0.4213 nm
Melting point	2800 ℃
Density	3.59 g/cm3(20 ℃)
Dielectric constant	10
Thermal expansion coefficient	13.5×10-6/℃
Deliquescence	Existence

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Size (Outer size tolerance: ±0.1 mm / Thickness tolerance: ±0.05 mm)	10×10×0.5 t 15×15×0.5 t
Orientation (Tolerance: ±0.5°)	(100)
Polishing	One-side / Both-side
Surface roughness	Ra≦1.0 nm Rmax≦5.0 nm