When evaluating reflective float glass, you must prioritize the Visible Light Transmittance (VLT) and the Solar Heat Gain Coefficient (SHGC). For energy-efficient buildings, a lower SHGC is preferred to reduce cooling costs. Ensure the glass thickness (typically 3mm to 12mm) meets the structural requirements of the project. Additionally, verify the coating type, distinguishing between Hard Coat (Pyrolytic), which is more durable for handling and processing, and Soft Coat (Sputtered), which offers superior thermal performance but requires specialized handling.