Synonym(s): Isobutylene Formula: (CH₃)₂C=CH₂ Formula Weight: 56.11 CAS No.: 115-11-7 UN Number: UN1055 Purity: 99% Other Notes: It is recommended that Brass hose adapter Z146811 is used for the 1 kg Sure-Pac. Packaging: 100, 400 g in Sure-Pac™