Plastic from Milk

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Plastic from milk
Materials and Equipment
The materials listed below are for doing the experimental procedure exactly as written. However, you can make changes to the experimental procedure in order to use a different size measuring cup and/or a stovetop rather than a microwave. * Mugs or other heat-resistant cups (4); they should all be identical so as not to introduce another variable (See Variables in Your Science Fair Project), and large enough to hold more than 8 oz. of liquid * Masking tape * Pen or permanent marker * Teaspoon measuring spoon * White vinegar (at least 8 oz.) * Milk (at least 12 cups); nonfat, 1%, 2%, and whole milk will all work * Microwavable liquid measuring cup; should be large enough
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Scrape the curds off of the cloth and knead them together, as you would bread dough, into a ball. This is your casein plasticWeigh the ball of casein plastic on a kitchen scale (set for grams) using a piece of wax paper to keep the scale clean. Record the weight in your table. 1. When weighing, remember to turn on the scale and first make sure it reads zero with nothing on it. This will help make sure your measurements are accurate. Also, use a new sheet of wax paper each time you weigh a different ball of casein plastic. This will give you exact weights (without crumbs and liquid from the last ball)

Terms and Concepts * Casein plastic * Plastic * Molecule * Polymer * Monomer * Casein * Acid * Yield * Curds
These resources have more information about, and photos of, casein plastic: * Morgan, J. (2001, June 11). Welcome to the Caseino. Retrieved July 30, 2012, from * Plastics Historical Society. (2011). Casein. Retrieved July 30, 2012, from
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