Picture of Easy Biodegradable Plastic
Now lots of products are made out of plastic. A lot of it is throw away and will stay in garbage dumps of thousands of years. Biodegradable plastic, unlike normal plastic made from petroleum, will decompose and become part of the soil. This Instructable will show you how one easy way to make some biodegradable plastic.

Step 1: Gather The Materials

Picture of Gather The Materials
This are lists of materials and tools needed to make the biodegradable plastic:

-Corn Starch
-Cooking Oil

-Spoon/Something To Measure With
-Microwavable Container
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rmdholmes1 month ago

What can it be used to serve? Can it be used to serve hot tea or coffee?

MakenzieS3 months ago

I tried using this recipe 3 different times and it came out all mushy every time... I can't figure out what I did wrong though.

Once it dries, will it be transparent??? PLEASE ANSWER!!!!!!

Hi. Please send me a copy of your research paper. I madly need it. Ionly have 2 days to prepare for this project defense. I beg you. Here's my email: micahmerilles@rocketmail.com Please please!!!!

sorry master dude your Easy Biodegradable Plastic in not working

actually it does work

amelie_lobo10 months ago


Yolo192710 months ago

FYI: http://en.wikipedia.org/wiki/Plastarch_material

Wikipedia article on a type of biodegradable plastic from modified corn starch.

Masterdude (author) 6 years ago
I'm going to try to post some new pictures.
Yes. It needs original pictures, especially of the final product.

i will soon upload them!

Why cooking oil
tantan2732 years ago
let me ask ya.... we don't have a microwave here... so, is there another thing that can heat up this PLASTIC?

can we use STOVE?
I hope it will... :/
Masterdude (author)  tantan2732 years ago
Unfortunately I do not know. I assume that all that is needed is heat and that there aren't any microwave specific interactions happening. I think that it should work, maybe even better if a stove is used since you have greater control over the process and consistency.
loikkonen3 years ago
Hi, how strong is this? Can it bend? I'm guessing it's not waterproof. I'm going to need plastic for a project, and it should be strong and preferably non-bendable.
Masterdude (author)  loikkonen3 years ago
Ir's been a long time since I've made some, but as I remember it wasn't flexible and being a plastic I would think that it would be waterproof, but I am not sure.
Jakwiebus3 years ago
probable the stupidest question ever:
will just heating it up work just as well? or is there any microwave magic going on ? ;-)
Masterdude (author)  Jakwiebus3 years ago
I haven't tried it by just warming up but I'd guess that all it needs is heat, not microwaves, to work.
PS1186 years ago
I'd like to know a little more of the chemistry. What exactly (chemically speaking) did we just make here? And what are its properties?
There is an entire website dedicated to answering questions about bioplastics, and especially for people interested in making it at home.


It has articles explaining the chemistry, as well as practical questions, and if you post a comment they often will create a post dedicated to answering your question.  It's had articles on everything from "why do some people say to use Vinegar in the bioplastic?" to "How can I make a bioplastic hard enough to make a toy sword?" (which is a funny one LOL).

Anyway, check it out, it'sa great resource.
I'm not totally sure, but I think it's some kind of starched-based structure. The water probably suspends the starch and the oil keeps it together while the water dries away, leaving an oil and starch-based plastic. LOL i reply two years after you posted the question
Ha ha. No problem. I had to scroll back up and look at what my question even was. :)
naveen_nk4 years ago
guys can u please tell me which cooking oil is best
Masterdude (author)  naveen_nk4 years ago
Well I don't know but the canola oil worked for me and I read that some others work as well. Probably any cooking oil will do.
I made it! I can't wait until it dries!
lemonie6 years ago
Can we see a picture of this stuff? L
Masterdude (author)  lemonie5 years ago
I just added this image. It is right after molding but before curing. I can't give images of it after curing because it fell apart because I didn't keep it moist enough. I'll try to get some better images another time.
Yea, that look like the thing, I might try this (except I've got a lot of lead I'd like to use...)

drawe21 lemonie6 years ago
I made a batch with 1 cup cornstarch, 1 1/2 cups water, 1 teaspoon oil and it came out well. (cooked for 8 min in microwave) Looks a bit like semi clear mashed potato's (semi clear) My photos came out looking very bad. Sorry...
crearc6 years ago
I tried it. I thought it was really cool to make, but it ended up being pretty brittle. some portions held together nicely though. I like how it's a simple formula, but it still needs to be refined. I want to be able to pour it into a mold but it isn't liquidy enough after. I was wondering, can you put clay or playdough in the microwave? Thanks.
Masterdude (author)  crearc5 years ago
It doesn't seem to be liquid after microwaving and I suggest covering the plastic with a moist towel or such to keep it from drying out before finishing curing. the brittleness probably is because some of it dries up and that part contracts causing deformations which cause brittleness so the key to preventing it should be keeping it moist while curing.
i think this may be just what i'm looking for for my seed trays, now i need to still come up with the mold. i need the 20 row seed tray (front tray) any ideas on what to use as the mold? for that matter any mold for any cell pack, or small flower pot...
Styrofoam. Just cut it to the inverse (opposite) Of what your trying to make and squish it into all the little holes.
edfel016 years ago
how long until this stuff deteriorates? and how strong is it and wat not but other then that nice simple plastic. Good Job
microman1716 years ago
I'm looking forward to trying this this afternoon. Does it melt again? This could be a super cheap thermoplastic. Polymorph anyone?
It doesn't melt or rehydrate (well, it soaks up water but you can't re-shape it). It has severe shrinkage-all that water you added? It evaporates to 'set'. It will burn...
strax6 years ago
i'm thinking plant pots. any ideas on molding these in mass and how long they last is appreciated. strax
i tried this, i think i put in too much oil, but mine was all sticky, maybe needed to knead it some more? really not alot to work with, i'm wanting to make around a 11"x13" seed tray, so how much u think i should try to mix up at one time.....gonna try again tomorrow tnx
S1L3N7 SWAT6 years ago
That looks cool. How long does this last until it completely deteriorates?
jtobako6 years ago
Final picture? I'd like to know what you thought about the shrinkage on drying cornstarch. I use a filler and get some nasty internal shrinkage.
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