When sourcing Mgo Sip, you must prioritize the core material density and the skin thickness. Ensure the Magnesium Oxide boards are at least 6mm to 12mm thick for structural integrity. The internal insulation, typically EPS (Expanded Polystyrene), XPS (Extruded Polystyrene), or PIR, should have a density of at least 15-30kg/m³ to ensure superior thermal resistance and load-bearing capacity. Additionally, verify the bonding strength of the adhesive used to prevent delamination under extreme weather conditions.