When sourcing Blum hinges, the first priority is verifying authenticity and technical specs. Look for the Blum logo stamped on the hinge arm and ensure the supplier provides official technical data sheets. Key technical factors include the opening angle (standard 110°, wide-angle 155°, or blind corner), the drilling pattern (usually 45mm for Blum), and the closing mechanism (BLUMOTION for soft-close, TIP-ON for handle-less, or MODUL for slide-on). For high-end projects, always specify all-metal construction with nickel plating to ensure corrosion resistance and a service life of 200,000 opening/closing cycles.