Elvanol 90-50 Polyvinyl alcohol DuPont Polyvinyl alcohol (PVOH) ADHESIVE Elvanol® 90-50 is a fully hydrolyzed polyvinyl alcohol (PVOH) designed to provide high film strength and binding power in relatively low-viscosity systems. This polyvinyl alcohol provides tensile and adhesive strength approaching that of the medium viscosity, fully hydrolyzed commercial grade PVOH. Elvanol® 90-50 is resistant to cold water, but dissolves readily on heating to 90°C (194°F) or above with good agitation. However, Elvanol® 90-50 permits higher solids solutions at a given viscosity and temperature, or lower solution viscosities at the same solids content and temperature as compared with Elvanol® 71-30. DuPont Elvanol® polyvinyl alcohol (PVOH, sometimes also referred to as PVA) is a water-soluble synthetic polymer with excellent film-forming, emulsifying, and adhesive properties. This versatile polymer offers outstanding resistance to oil, grease and solvents, plus high tensile strength, flexibility, and high oxygen barrier. DuPont markets three types of Elvanol®: fully hydrolyzed, partially hydrolyzed, and copolymers. All are made by alcoholysis of polyvinyl acetate (PVAc). The fully hydrolyzed grades contain few, if any, residual acetate groups; while partially hydrolyzed grades retain some of the residual acetate groups. The partially hydrolyzed grades dissolve in water at room temperature; fully hydrolyzed grades dissolve in hot (200 degree F) water, and remain in solution when cooled to room temperature. The copolymer grades, developed specifically for warp sizing, offer a unique balance of properties that make them the most versatile PVOH grades available to the textiles market. Elvanol® is widely used in diverse applications such as: adhesives for paper and paperboard, wood, textiles, leather, porous ceramic surfacesand other water-absorbent substrates; The unique combination of properties inherent in Elvanol® has resulted in its use in a wide variety of industrial adhesives. Water solubility - combined with high tensile strength, flexibility, and tack or tackiness - makes it one of the most useful synthetic polymers in the adhesives industry. Fully hydrolyzed polyvinyl alcohol. Resistant to cold water. Designed to provide high film strength and binding power in relatively low-viscosity systems.