the material. PORTA had never used a PUR hot melt adhesive before, however, and did not yet have a suitable melting system for this type of adhesive. But as [...] Today, the dispersion adhesives based on polyvinyl acetate (PVAc), different hot melt adhesives (PUR and EVA), and glues based on emulsion polymer isocyanate (EPI)
https://www.jowat.com/en-VN/newsroom-detail/a-partnership-that-opens-doors/