Laminated Glass Units – Edge Blushing

Edge Blushing

In both structural and butt glazed applications, silicone sealants may come in contact with the polyvinyl butyral (pvb) interlayer used in laminated glass. When silicone contacts the laminated glass edge, a cosmetic blushing of the pvb interlayer will occur over time. It generally begins as a small bubble formation at the contacted edge, which then grows to form a limited unbonded area at the glass edge. This reaction is limited and generally does not exceed more than 3/8″ (9.5mm). Edge blushing may be visible however does not affect the structural integrity of the laminated glass with respect to its ability to resist uniform loads.