Step 3: melt the Styrofoam

Start by breaking your block or blocks of Styrofoam in pieces that fit into your glass container. Then take the pieces and push them into the acetone. Continue pushing Styrofoam into the acetone until the blocks you put in don't melt anymore.

Then wait one to five minutes for some of the acetone to evaporate. Wait one minute if you want it to mold the plastic and five if you want to shape it. The more you let the acetone evaporate the more solid it will be. You might even want to mold it while its still "liquid".

Here's a video that demonstrates the melting process.

<p>Mine always take forever to harden, so I put it in the freezer for a couple days. I use it as a clay.</p>
<p>Thanks for this instructable, i found it quite accurate and wanna ask you if is it possible to add some dye.</p>
<p>I don't know whether you can add dye, but when I do it and I want to add color, I use colored styrofoam like the red ones and sometimes green or blue in meat and vegetable packages in plastic wrap.</p>
This is how you can make napalm, you can also do it with gas.
i made some of this stuff recently and filled a short length of PVC pipe with it as a mold. the next day i pick up the pvc to find that the plastic had not dried and also the PVC was going soft! i think that acetone is a solvent for PVC but won't dissolve it. i will experiment more and let you guys know.<br><br>PS. the pipe was standard 20mm plumbing PVC pipe
Acetone breaks down and reconstitutes almost all plastics. You could also use Acetone and Legos. Acetone and any ABS plastics will cause the plastics to melt essentially. That's why the PVC was going &quot;soft&quot;. If you had more acetone there it would have melted it and could have caused a very large mess. I wouldn't recommend this type of &quot;plastic&quot; for injection molding.
it went only a little soft. i actually tried to shove this stuff(acetone + thermocol) into a paper mold but even though i had painted it with resin it tore. any suggestions as to mold it? also i want to make a look alike spartan spear for a costume out of 3/4 in CPVC piping but i do not know how to shape the blade into one. any ideas for molding this?<br>please respond.
<p>Ol&aacute; , li seu coment&aacute;rio e vim te dar uma ideia, que tal voc&ecirc; usar argila para criar seu molde. Ap&oacute;s pronto e seco o molde pode ir para queima, fica resistente.</p><p><br></p>
Could you line your paper mold with aluminum foil?
the mold tore, so i don't think it would make a big difference. this would work though if it was just sticking.
<p>the mealting works with most solvents eg terps petrol and PVC is also plastic so it would mealt</p>
<p>Ccan you add black dye?<br>How long does it take to harden?<br>How hard does it get?</p>
I did this but the inside of my ball won't dry... How can I fix this?
What does the MOHs rating look like on this?
Umm, idk if anyone else noticed but he made 'napalm' along with his plastic *-*
Yeah, don't keep that near an open flame...
Can I use this kind of plastic for making &quot;teeth&quot; to hide my braces? And can I use clay for the mold of the teeth? Help would be gladly appreciated. :)
I can make my own plastic products by using some recycle plastic in my home. I am using the step that just same like the &quot;plastic injection mold machine&quot;. I can make any think with different colour and I can make it just a few minutes.
Is there an instructible which shows actually making things from this kind of plastic? I made some as an experiment but it was so sticky it's hard for me to imagined making anything useful from it. I can't find a site anywhere showing how to use it.
You mentioned how the Acetone could damage your eyes. I'm wanting to make a pair of cosplay glasses with this how-to, and I was wondering if wearing said glasses would damage my eyes at all?
I'd say that it's safe. After all all of the acetone has already been evaporated, but I'd wait a day before putting them on, just to make sure.
You need to look up Material Safety Data Sheets for any chemical you use they are very practical, giving lots of information about the safety aspects of solvents and other chemicals. Acetone can remove some of the oils and fats from your skin . There is also flammability issues as you all know. All industrial chemicals have some issues it just depends how you use them. MSDS's are full of practical info, just google them
adding gasoline is do it yourself napalm. <br> wonder if the 'coffe cups' make a better plastic with acetone than the 'packing peanuts' do?
Looking at the science behind it, you theoretically don't need to use acetone to make this react. <br> <br>You just need a non-polar solvent that could be potentially less dangerous, but they may not be as readily available as acetone.
I had this thought myself, but acetone is good because it evaporates quickly. I Made a test batch of this stuff about - 10-15 millilitres - using turpentine. It dissolved well enough, but 2 weeks later it's still squishy.
Yeah, I was too lazy to find acetone so I just used gasoline
Congratulations, you now have a napalm-esque substitute.
i tried to take a blob of hardened plastic(this stuff) and melt it to pour into my mold. i still can't get the smell out of my lab and the stuff didn't work out. took ages to even get gooey.
i tried to force this stuff into a mold made from cardboard made with the help of pepakura. the paper completely tore. any one have any ideas on how i can make similar molds and perhaps inject the plastic into it?
how is this for moulding PC case parts for mods? is this stuff hard to paint? my thoughts are solvent based paints should work.
Polystyrene solution in acetone. Polić doughy mass. Then. Add gradually, stirring with turpentine. Get a totally transparent thick liquid. How do I use? Think for yourself.
Polystyrene solution in acetone. Polić doughy mass. Then. Add gradually, stirring with turpentine. Get a totally transparent thick liquid.
You do know this is how u make napalm right?
???<br>you make napalm by adding aluminum soaps to petrol (gasoline)!<br>this would be flammable due to the acetone and the drying plastic would be like napalm (sticks 'n' burns) but not when dry. where did you get that idea from?
I was just experimenting when I realized the common ingredients. There is an easier way to produce napalm tho. I believe someone even made an instructable how to do so. Which surprised me. Just be careful. Napalm can be very useful if not used for its original purpose.
How are the ingredients common?<br>Napalm=Gas+Al Soap<br>weird plastic=Acetone+Styrofoam<br><br>i know that you could also use gas as the solvent but 2 things- gas is more flammable and it rather volatile as compared to acetone.<br>here acetone is used instead of gas<br><br>(PS- Textbook explainiation for 'volatile' means it evaporates easily, not explosive but often is.)
A styrofoam does the same thing when acetone eats it. Stop questioning me and try it both ways if u don't believe me dubie. Then talk to me about what I don't know. :)
i though this site had moderators on language. i am betting you are an American.<br>napalm, when lit almost explodes then starts to burn. do you really think i want to go to hell directly?<br>this 'might' be an explosive but it won't be napalm. it will be somthing else.<br>
&quot;napalm&quot; is sticky flamable goo<br><br>so acetone + styrofoam :-)<br><br><br>also you can sniff acetone :-)
napalm contains by definition gasoline and a thickener...
Which is where the Al Soap comes in...
or other substances... Napalm B contains polystyrene as thickener
Then u don't know how to make it. Sorry I thought u understood English. My bad.
no need to start trying to act smart<br>i work with weapons as a living. i know my stuff. i most certainly understand English and spoke nothing but all my life. I'm just not fimiliar with slang terms like 'dubie' so i looked it up on urban dictionary
I'm sorry I have to say this, because this kid is being a but of an ass [Canadian] about it, but acetone can actually form a very short-living napalm&nbsp;substitute,&nbsp;albeit&nbsp;not all that effective.
Whats with people jumpin on each other over me just saying u 'can' make napalm this way. And if preserved right can last a month. Good for camping not for picky bitches. :) peace
scratch that. your most likely Canadian.
The poor man's Napalm is just Styrofoam in gas. The last time i played with the stuff was about 12 years ago. I used a gas oil mix and Styrofoam. It made it a bit more manageable as far as handling it. It wasn't sticky like it would be with strait up gas.
they are rather common materials though. I bet you my girlfriend in all her non-crafty-ness has all these ingredients. I think it was a great idea. very clever of you stu2themax. <br>

About This Instructable


429 favorites


More by エル: How to &quot;make&quot; plastic
Add instructable to: