Nov 30, 2005 · The product is then baked at 400°C for a few minutes, allowing the polymer to melt and form a film over the surface. Following this, the Tefal 7 company was set up in 1956 to market non-stick cookware. Gore-tex. In 1969, Dr Bob Gore found a way of expanding PTFE by heating and stretching it to form a membrane with microscopic pores in the