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It seems like a conspiracy to keep everyone from knowing this.

Custom cape sellers don´t say what it is, the women from the draperies I questioned always say something along the line of "coated propylene" which is no longer in the making because the only company who sold it went bankrupt in 2003.

Even LEGOs customer service can only say "Acrylic matte medium" which apparently is some kind of paint artists use to paint on canvas.

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It is fabric - probably cotton or polyester - coated with an acrylic substance that makes it more durable and tear-resistant. You can easily print on acrylic-coated fabric using standard laser printers.

You can purchase acrylic-coated fabric through suppliers that sell sign-making supplies as well as art supply shops.

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The term acrylic is used for many mediums, like acrylic paint (liquid), acrylic fiber (clothing), acrylic rubber (flexible) and acrylic glass (really hard).

So, as you see, it is possible to make those capes out of a type of acrylic material.

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see this tutorial on Creating custom fabric elements for Lego minifigures

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Thanks for pointing out that resource. I would recommend that you include more than just a link, though. As it stands, this doesn't provide an answer to the question. Answers should be able to stand on their own without the need for external resources. – jncraton Apr 10 '13 at 12:27
@jncraton You're right, it's not exactly an answer to the question of what Lego uses ,but this is the best information i found on the subject and i didn't want to copy/paste the entire page – Syberion Apr 10 '13 at 22:08

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