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melting with cooking oil
On my exprerience with styrofoam, i’ve being trying different ways of melting this material:
First I tried the most common one, acetone, and by the way I think it was the worst result (first picture), it get a fragile, rough and irregular material, because when it gets dry it deforms a lot.
Then I tried another type of solvent, but now with some heat. I used cooking oil in a pan. The results were a lot better, but the molding process was very dangerous and difficult to control without burning myself (second and third picture).
The last way I tried to transform the material was only with temperature (160° to 180°C) in an oven, it was a pretty cool result, but it delay a lot more to transform than with the other techniques.
And about my shredding experience, as Adrian said, the material melted in the shredder but it was because of the mesh I was using in that moment, the hole’s diameter were too little for the low weight of the material, (4mm) then, because of the friction it started melting, so now i’m trying different diameters to know wich is the best one to work with.