When sourcing used ship rope (often reclaimed mooring or towing lines), the primary concern is residual tensile strength. You must verify the material composition, typically Polypropylene, Nylon, or UHMWPE (Dyneema). Inspect for abrasion levels, UV degradation (chalking), and internal fiber fused areas which indicate over-stressing. For B2B buyers using these for decorative or low-load industrial purposes, ensure the supplier provides a visual inspection report and confirms the rope has been cleaned of salt and marine biological residue to prevent rot.