How to Differentiate a Natural Rubber from a Rubber Neoprene

This video shows the difference in a simple test of how to differentiate a Neoprene Natural rubber, it was taken a sample of a support of Neoprene supposedly manufactured by an artisan workshop in Ecuador, this supposed support stated to be manufactured with neoprene, unfortunately the result is not Was thus, and to corroborate the results the samples were sent to the Escuela Politécnica Nacional and which did not prove to be neoprene, the samples are in custody at the Politécnica Nacional.