Silverstone (plastic)
Silverstone is a non-stick plastic coating. A three-coat fluoropolymer system that produces a more durable finish than Teflon, Silverstone was released in 1976 by DuPont.
Silverstone® is a specialty line of superior nonstick finishes produced by DuPont. Silverstone® coatings are three-coat (primer/midcoat/topcoat) systems formulated with PTFE and PFA. Characteristics of Silverstone® coatings are similar to other PTFE coatings, however durability is greatly increased. A reinforced version with higher scratch and abrasion resistance is also available. Maximum continuous use temperature is 290°C/550°F.
Read more about Silverstone (plastic): What Is Teflon