When evaluating black safety nets, you must prioritize High-Density Polyethylene (HDPE) or Polyester materials with UV stabilization to prevent degradation from sunlight. The mesh size should be selected based on the application: typically 20mm to 50mm for debris containment and larger for fall arrest. Ensure the tensile strength meets industry standards, usually requiring a breaking strength of at least 2.2 kN for personnel safety nets. Additionally, verify the border rope diameter, which should be at least 8mm to 12mm for secure anchoring.