Easy Biodegradable Plastic




Introduction: Easy Biodegradable Plastic

I make K'nex guns, specializing in semi-automatic, RBG-Slingshot hybrid systems which i use in mo...

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

This are lists of materials and tools needed to make the biodegradable plastic:

-Corn Starch
-Cooking Oil

-Spoon/Something To Measure With
-Microwavable Container

Step 2: Proportions

The proportions to make the plastic are:

1 TBSP Corn Starch: 1.5 TBSP Water: 3-5 Drops Cooking Oil

Step 3: Preparations

Mix the ingredients together to form a milky looking liquid. Once you have done this it is ready to be microwaved.

Step 4: Microwaving

Put the mixture in the microwave and set the microwave on high for 25-30 seconds. The mixture should start to bubble and should become slightly transparent. Keep an eye on the mixture to make sure nothing goes wrong.

Step 5: Molding the Plastic

When it looks slightly transparent, take it out. Let it cool a bit so you can handle it. Then knead the plastic until it is soft and can be molded like play-dough. Now you can mold it into whatever shape you want it to be. Once molded leave it for about 24 Hrs. for it to cure and become solid. It's best to keep the surface from drying out while it is curing. The image below is the plastic when shaped.

Step 6: Ideas

-You can add food coloring to give the biodegradable plastic some color.

-You can use it to make plant pots so you start the plants indoors and when they've grow you can put them in the ground.



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    58 Discussions

    i dont have a microwave, can i use a bunsen burner??

    Sounds great. My mold is Schedule 40 PVC and I am afraid the microwaving will damage the mold.

    Suggestions please.

    1 reply

    microwave the mixture then put the outcome in the mold and wait for it to cure

    Water and heat make the starch polymers unfold and line up like normal plastic polymers (it's called gelatinization). Once this takes place, starch can be modeled in to what ever shape you want. Unfortunately, without adding other fillers, this plastic will break very easily and will melt in water. Not sure what the oil is for...

    Hello, it looks like you are very smart. Do you know the specific reason for why are the proportions this way?


    I want to use this in a form made up a form made from schedule 40 PVC double walled tube, to make a biodegradable round tube with a closed end approximately 6" long and 2" OD. Can I use a regular oven in place of a microwave and at a temp of approximately 130 degrees (so not to melt the PVC).

    Thanks! This is perfect for what I need!!!

    I made this and i want to experiment with it.

    The flower pot idea is great but you would need a lot of the stuff to make one

    I made this, but didn't take any photos. I doubled the recipe and it turned out nice. It's slightly transparent, about the texture of stress putty, and actually smells like tortillas (It's the corn starch). I like it, and will make again

    I needed this for my exam so you saved my grades bro. You are LITERALLY AN ANGEL

    bloody wow . tech is going mad this year. well done. this substance has made my brain spin and the business ops are just mad. thank you for making me money.

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

    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!!!!!!