Phosphorescent Paint in Glass Laminates

Defined by the building law in each publicly accessible building (e.g. schools, administration etc.) emergency exit routes have to be marked. This is usually realized by means of active or passive lightening systems. The use of passive lightening systems require comprehensive components with an independent, battery-powered energy-supply that produces light even in the case of an energy black-out (e.g. disaster situations), which makes the systems complicated and expansive. Alternatively after-glowing, phosphorescent signs, attached on walls, wallpapers or doors are an existing alternative. Mostly known to everybody are the green emergency exit signs. Used inside of buildings their appearance has mostly a disturbing and negative attitude, even more at premium interior designs. Both described solutions have been known for many decades and possess individual disadvantages. Therefore the composition of passive lightened systems with premium-quality surfaces leads to a widely usable product phosphorescent glass. This glass consists of laminated glass with a phosphorescent paint application within the glass interlayer. The paper describes the research and development of phosphorescent glass. The processing focus lies on the materials investigation of different paints, different EVA-interlayers and glass surfaces with respect to various glass laminate build-ups as well as the development of an appropriate application process of the multi-layer paint application. The second part explains the mechanical testing of the laminated glass specimens with regard to their shear and balldrop strength before and after accelerated aging in temperature-moisture climate similar to IGU-testing standards.