A synthetic rubber produced by polymerization of butadiene, developed during World War II.
From German Buna, a trademark combining 'butadiene' and 'Natrium' (sodium). Developed by German chemists in the 1930s as a substitute for natural rubber.
Buna rubber was a huge deal—Germany invented it during WWII when they couldn't import natural rubber, and this chemical breakthrough changed manufacturing forever, making synthetics possible!
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