What is the difference between PVB and EVA interlayer applied in laminated glass?
What is PVB and EVA?
1, PVB (Polyvinyl butyral) or polyvinyl butyral; EVA is ethylene vinyl acetate copolymer (ethylene-vinyl acetate copolymer)
2, Processing and storage conditions:
PVB in low temperature (18-22 DEG C) (dry humidity 25%-40%) under the conditions of processing and storage, especially for the humidity requirements are very strict, and with high temperature (120-140 DEG C) and pressure (1.0-1.5MPa), most of production of autoclave for processing. Storage conditions;
EVA relative low temperature does not exceed 30 degrees, humidity is lower than 80%, closing equipment requirements are low, the vacuum degree is larger than 700mmHg (0.092Mpa), the temperature is 100-110 DEG C; coupling process of PVB complex than EVA, a longer period of time, energy consumption is also large.
3. Use: PVB, more for outdoor, such as building curtain wall, car front block glass, etc., EVA more for interior decoration