ISO9000 Competitive price and good quality Polyvinyl formal acetal resin. PVFAppearance =Lumps up to 40 mm, from white to light yellow COLOR formal 7-14 %ethylal 58-74 %acid value 0.4max water content 2.0max viscosity 200-2000 mpa.sViscosity mesured of 10%-solution in solvents chlorbenzene : 2- ethoxyethanol (1:1). Viscosimeter Dia 5,4 mm), sec = 20-60 polyvinyl formal acetal resin