4.1 Solderability test: 260 ℃ ± 10 ℃, dip tin 1 ~ 3S, dip tin area ≥95%. <BR>4.2 Copper wire elongation: 14% ~ 21% (Note: refers to the single copper wire elongation before stranding ). <BR>4.3 The product has no appearance problems such as fluffing, dirt, breakage, over-density and over-thinness. <BR>4.4 PET woven mesh is non-flame retardant. <BR>4.5 with "▼" number is the key quality control size
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