Vacuum Forming Styrofoam or Something that is like acrylic but cheaper

[cubbiesfan50]

I'm looking to create a new product that would be made out of styrofoam or like acrylic but cheaper, hold water, and hopefully would use a vacuum molding machine. I have a few questions about this: How expensive would it be to make a vacuum molding machine? Can I vacuum mold styrofoam? How can I make a 3-d figure with a vacuum mold? How expensive is styrofoam to buy in semi-thick sheets or the pellets? How can i get it so that the water is non-toxic? (I was thinking some kind of thin coating of wax, but I have no clue what kind) Any information that you could give to me about working with styrofoam would be greatly appreciated.

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[RomanLini]

Try looking up "rotary molding" or "thermo rotary molding".

That is probably the best way to mold a water container and should give you a starting point.