It is difficult to imagine, now, a time when you had to really pull out all the stops to share the good news about plastics.
The stuff had been around in various forms since the mid-19th Century. But in 1939 everyone was talking about the latest advancements. Nylon and Neoprene became a replacement for silk and a synthetic rubber as a plastic ingredient.
People weren't sure, though, if they could put it in their dishwashers or microwaves. The late 30s were a confusing time in kitchen utensils.