Do not use abrasive materials such as sandpaper or emery cloth because they will scratch the glass.: Ne pas utiliser des matériaux abrasifs comme du papier sablé ou de la toile d'émeri sinon le verre sera égratigné.: By adding polycyclic phenols to the resin produced for emery in specific conditions and formulations, it has been enabled to provide elasticity to emery cloth or emery paper.