ADVERTISEMENT

Waldo L. Semon

Born: 1898
Birthplace: Demopolis, Ala.

PVC plastisols—Semon's work turned polyvinyl chloride (PVC), first considered worthless, into the world's second-best selling plastic. He also provided the technical leadership that led to the discovery of thermoplastic polyurethane, synthetic “natural” rubber, and the first oil-resistant synthetic rubber. (1995)

Play Poptropica Worlds

Download Poptropica and play for free!

Explore a limitless universe of uncharted islands
App store
Google Play
 
See also: