# Is it possible to melt HDPE to a point where it has similar viscosity to engine oil?

I have a few pieces of HDPE that I want to melt and cast into a cube of around $\pu{5 cm}$ each side, similar to what one would do with cast resin.

I tried putting it into an oven and heating it to $\pu{250°C}$, where it melted, but never enough to pour it somewhere.

Is there a viable way to melt HDPE scraps to a point where it becomes fluid, with a viscosity similar to engine oil, and retains this state long enough to pour it?

• HDPE oxidizes rapidly at those temperatures. You'd need to at least do it an inert environment I would guess. Try looking into HDPE rotomolding to see what conditions they use. – ericksonla Mar 21 '18 at 21:01