Did you know that chewing gum is made from synthetic plastic? (treehugger.com)
Before synthetic plastics were created, glass and clay were considered the primary «plastics,» alongside a few other naturally occurring substances like tree - gums and rubber. (wellnessmama.com)
Silicones — or siloxanes as they are also known — are something of a hybrid between synthetic rubbers and synthetic plastic polymers. (mindbodygreen.com)