1,3-Dibromo-5.5-Dimethyl Hydantion CAS Number 77-48-5 Appearance White Solid Assay 98%min Melting point ca. 198 C (decomposes) Bromine content 54% min Loss on drying 0.5% max Use Useful and easy to handle reagent for bromination of various aromatic derivatives substituted with electron donating groups Storage Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances. Keep refrigerated. (Store below 4Â°C/39Â°F.) Store protected from moisture.