More Research!

I looked arouns various sites, and of course they all have different procedures. For example the one on WikiHow (http://www.wikihow.com/Make-%22Plastic%22-out-of-Milk) says that I should microwave the milk. But most other methods like this one (http://www.instructables.com/id/Homemade-Plastic/) say that I should boil the milk to a certain point. I'm pretty sure boiling the milk would be more accurate, as the microwave could have some small errors. Also, it doesn't really seem scientific to use a microwave...

Casein is actually used in cheeses to keep it together and in glue! It's also used for numerous other things, such as paints, soap making and cement, as shown by this website: http://chestofbooks.com/home-improvement/repairs/painting/Paint-Making-Color-Grinding/Part-V-Casein-And-Cold-Water-Paints-Chapter-XXXI-Origin-A.html.

Some properties of casein are that it is tough, flammable, resistant to water and has poor dimensional stability (I'm not exactly sure what this means, but I think it's the ability of something to stay in its original dimensions when it's being changed. I will ask Ms Zhang when I see her next!) with info taken from http://books.google.com.au/books?id=0g9QjxsbqmUC&pg=PA136&lpg=PA136&dq=casien+plastic+heat+chemical&source=web&ots=u7KLwl6eWg&sig=9V40234r-SgMztftGpwzPYDrQgI&hl=en&sa=X&oi=book_result&resnum=1&ct=result#v=onepage&q=&f=false

One last thing. Ms Zhang mentioned that I have to put in water with the milk and everything for my experiment but it's not in any of the methods I've encountered! Maybe she accidentally said the wrong thing. :D