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Chapter 2 - Heat Sources
Most plastics require between 250 and 400 degrees F. to get soft enough. We are not trying to melt the plastic, just make it soft like a sheet of rubber. Your kitchen oven was designed to heat food at these temperatures, so its a safe and convenient way to heat plastic as well. This chapter shows the differences between gas and electric ovens and how to use them effectively.
Find out why heat guns and heat lamps should be avoided. Other heat sources are discussed, such as, electric frying pans and griddles, toaster ovens, hot plates etc.., with advice on using each one
I found this; which should give you some small idea of what can be done. This is from a web page that is about a book on vacuom forming plastics, "workshop" was at the top of the page.
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