The DWFR (dual wall, fire-retardant) products are the first dual-wall heat-shrink tubing products to be rated for the UL VW-1 flammability test specified by the UL 224 standard. The tubing’s highly flame retardant polyolefin jacket and a thermoplastic inner adhesive wall provide excellent electrical insulation and mechanical protection. When properly installed, the tubing shrinks to create a moisture-resistant seal. The DWFR tubing products’ high heat shrink ratios of 3:1 and 4:1 enable designers to use just a few tubing sizes across numerous applications – from home appliances to industrial controls to automotive.
The product line comprises 14 sizes from 3 to 52 mm (inside diameter); of those, seven have 3:1 heat shrink ratios and seven have 4:1 ratios. The tubing can at temperatures ranging from −40°C to 110°C and its medium wall jacket offers protection from abrasion and bending. The tubing’s adhesive liner is capable of bonding to a variety of substrate materials, including plastics, metals, and rubbers.
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