When sourcing prefab kitchens, prioritize waterproof and moisture-resistant materials. For cabinet carcasses, 18mm thick Marine Plywood or MFC (Melamine Faced Chipboard) with E1 or E0 grade emission standards is recommended. For countertops, Quartz stone (20mm thickness) is the industry standard due to its scratch resistance and low porosity. Ensure all hardware, such as hinges and drawer slides, are 304 Stainless Steel with soft-close mechanisms (e.g., DTC or Blum brands) to prevent rust and mechanical failure.