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LOW VISCOSITY OF GLASS LAMINATING EVA INTERLAYER FILM (ETHYLENE VINYL ACETATE) By Peter Lin The viscosity of EVA interlayer film is lower than PVB interlayer film (polyvinyl butyral ), which makes EVA film is best for laminating uneven surface sheets, like tempered glasses, or other polymer sheet materials (PVC, PET, Polycarbonate, Acryle, etc.) The reason is that, due to low viscosity, melted EVA Film is easy to flow over every places of the surface of the laminating sheet to fill the uneven gaps, which will reduce the possibility of bubbles and increase the adhesive strength because more place of glass surface(or other materials sheets) have been coupled by EVA Film.
