When sourcing panels, you must prioritize material composition and structural integrity. For construction, ensure Core Density (e.g., for sandwich panels, a density of 35-42 kg/m³ is standard for insulation). For decorative or furniture panels, verify the Formaldehyde Emission Class, strictly adhering to E1 or E0 standards to ensure environmental safety. Additionally, check the Surface Treatment, such as PVDF coating for outdoor aluminum panels to ensure UV resistance and color retention for 15-20 years.