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Casein, a protein found in milk, can be easily precipitated from standard moo juice with vinegar and turned into a malleable homemade plastic. Coffeebot wrote an Instructable that shows you how:

The final product is quite rigid when it’s thick (1/8 inch or thicker), moderately pliable when it’s a little thinner, and brittle if it’s paper thin. It’s also sandable and paintable.

I guess casein-based plastics used to be all the rage for buttons, jewelry and pens at the beginning of the 20th century.

Homemade Plastic From Milk [via MAKE]

See also: Moldable plastic from styrofoam


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Comments

  1. Anonymouse says:

    According to a few things I’ve read, casein plastic will eventually decompose unless treated with formaldehyde or something similar because it’s basically just a concentrated clump of dairy protein. You’re basically just making really hard cheese here.

  2. Francesco says:

    Plastic from Milk? I’ve always called it “Ricotta cheese” and not “plastic”… :-)))

    I’m serious: if you put vinegar into hot milk you will get a soft cheese called Ricotta in Italy.

    BTW, if you put vinegar into hot soy milk you will get Tofu (not as good as Ricotta)….

  3. Francesco says:

    Plastic from Milk? I’ve always called it “Ricotta cheese” and not “plastic”… :-)))

    I’m serious: if you put vinegar into hot milk you will get a soft cheese called Ricotta in Italy.

    BTW, if you put vinegar into hot soy milk you will get Tofu (not as good as Ricotta)….

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