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Hi: There is one biodegradable PLA (Polylactic acid)sheet for = thermoforming, but it will brittle as well as heat resistance is not = enough after thermoforming. I like to modify this sheet and need help. 1). More elastic. I believe add some rubber can help, however, = transparence will loss as well as non compatible, I like to get some = rubber type resin which can help elastic and keep transparence. = Plasticizer seems good, I don't know which one is suitable. Add = compatible resin is similar add plasticizer which can help elastic. 2).Increase heat resistance and keep transparence. I add some = calcium carbonates which can work, but loss transparence as you know.=20 The best way is add some resin which can get more elastic and = increase heat resistance. So, please help.