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Adhesive breaks (separation at the interface) have been obtained between high polymers and glass that require no external mechanical equipment to induce break. Visible light is emitted during these breaks. The polymers are contained in Pyrex vials that are immersed in a 125°C oil bath. After a nominal polymerization period, the polymers are removed from the bath. The adhesive breaks occur while the polymer‐glass system is cooling toward room temperature. The properties of the light due to these breaks have been studied with a photomultiplier, pulse‐height discriminator combination. The wavelength of the light was measured spectrographically and the internal temperature of the polymers was monitored during the cooling process.