Whenever I heat plastic, it hardens after it cools and becomes brittle. How do I stop that from happening or what do I mix it ?
extra suitable stick a chrome steel tube into the strains and clamp them. It sounds such as you have that GM flex-gas plastic line. That stuff gets brittle with age and that they do no longer make it anymore. optimistically it would not crack in yet another spot. do no longer positioned any warmth on that line. i could replace the line and in no way use E85, it truly is not any solid besides so a approaches as capacity is worried.
It will depend on the type of plastic. Basically most plastics are amorphous, that is they have little or no crystalline structure. This gives them a broad range of melting or soften points. When you heat a plastic and cool it slowly it give the polymers more time to align and they become more crystalline. Crystalline structures tend to have narrower melt and softening points and hence tend to brittleness. This is a general comment, as I said the properties will differ depending of the plastic and the glass transition temperature. More info is required to be more specific.
