SLN flat webbing sling Flat webbing slings are manufactured according to EN 1492-1 standard and made available for use. Polyester slings are mainly used as a lifting equipment. Slings can be categorized and colored by their capacity and safety factor. 100% polyester webbing sling, it is made of 100% polyester which is a soft low stretch material with quick drying capabilities. Polyester retains much of its strength when wet, also resists UV light, mildew and abrasion. The safety factor of webbing sling is 4, 5, 6, 7, 8. Producing Standard: EN 1492-1-2000, ASME B30.9-2006, AS 13531-1997, IRAM5397, JBT8521.1-2007