When evaluating Sisal Yarn, you must focus on the yarn count (tex or lea) and the number of plies (1-ply, 2-ply, or 3-ply), as these determine tensile strength and thickness. For industrial applications like core ropes for steel cables, ensure the oil content is strictly controlled (usually <15%) to prevent degradation. For decorative or craft use, prioritize bleached or natural white grades over lower-quality 'UG' (Under Grade) fibers to ensure color consistency and a smoother finish with minimal hairiness.