Does anyone know how to make styrofoam. I am tring to build a small boat and I need a lot of this stuff

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gmoon9 years ago
Different types of foam (but probably not styrofoam) are used as a core material in composites for all types of craft, including 99% of surfboards. It's a tried-and-true technique. Even the pink construction-grade foam would be preferable to styro. Beware that the chemical composition of some resins will eat polystyrene foam. Polyester resins, the type found in automotive fiberglass kits will do that. Real epoxy resins (marine epoxy) are usually safe.
Goodhart gmoon9 years ago
Beware that the chemical composition of some resins will eat polystyrene foam.

and a number of solvents LOL I found this out many moons ago when I made a replica of our solar system with polystyrene and then went to paint them with spray paint.....and they melted *sob*
now you made me sad too! stupid empathy.
At the time I was surprised (I was pretty young), and then sad because I wasn't going to be able to get "more". Most of the planets ended up looking like asteroids....all misshapen and stuff. :-)
now im even sadder
I was not sad about it, I learned valuable lessons from that, helped me want to explore chemistry a bit more :-)
gmoon Goodhart9 years ago
Ooof. No fun, that. (I have seen designers use this to advantage--make the fiber/resin shell with a safe resin, then dissolve the foam inner (male) mold with solvent. The shell only remains, so it's even lighter...)
Goodhart gmoon9 years ago
once the solvent dried, the polystyrene hardened and became quite rigid.
Goodhart9 years ago
Making Styrofoam involves putting polystyrene (a petroleum derivative) under tremendous pressure, resulting in very squished particles that are shaped into planks, last forever, and repel water, according to Dow. Do you mean rather, Expanded Polystyrene (EPS) ? EPS, is made by heating polystyrene particles, pouring them into molds, and injecting them with steam. Meat trays, coffee cups, picnic coolers, and their ilk are all made from EPS, never from Styrofoam.
westfw Goodhart9 years ago
I thought "Styrofoam" was a brand name for a particular company's EPS, similar to the way "plexiglass" is a particular Acrylic sheet...
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