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I’m asking this because, I’m trying to find how to make a powerful crucible that when you melt any plastic in it, it doesn’t not happen anything to it, and you can also hold it with your hands even though it contain molten plastic.

Question: It is possible to create a powerful crucible from simple materials that you can hold it with your hands and in the same time contains molten plastic in it without causing any problem? If yes, what type of simple materials I need to create this kind of crucible?

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First you need to check the melting point of the specific thermoplastic you intend to use -- some will burn or give off nasty fumes at temperatures where others are still solid. And you need to be sure you actually have a thermoplastic and not a thermosetting plastic.

But for most common thermoplastics, ordinary ceramic kitchenware will handle the heat perfectly well. If you melt the plastic then pour it into the bowl, you'll be able to handle the bowl. If you want to put the bowl in an oven to melt the plastic, obviously you'll need something like oven gloves to handle it with.

If you really want to make something yourself, clay will do the job (it will work just dried, without firing). Unglazed it will be hard to clean.

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