3-inch Single Crystal Sapphire Wafer, C-Plane (0001), SSP/DSP , Al₂O₃ Epitaxial-Grade Substrate Product Description: This is a 3-inch (Φ76.2 mm) high-purity single-crystal α-Al₂O₃ sapphire wafer with a standard C-plane (0001) crystal orientation. It is available in two finishes — SSP and DSP — and supports fully customizable parameters including off-axis angle, thickness and primary flat.A sapphire substrate is a thin slice fabricated from single-crystal sapphire material.