1. Injection Molded Plastic By: Dan Quates Material science 3344

2. Injection Molding • Injection Molding is the most widely used technique for fabricating thermoplastic materials because it can mass produce parts for relatively low costs. • Melted plastic is pressurized and forced into a prefabricated mold. There, it is allowed to cool and will take the shape of the mold as it solidifies.

3. Thermoplastics used in Injection Molding • Polyethylene • Polypropylene • Polystyrene • Poly(vinyl chloride)

4. Polyethylene Polyethylene is used for everything • Grocery bags • Bottles It’s structure is [-CH2-CH2-] Not good for high heat applications

5. Polypropylene • Polypropylene is not as versatile • Can be used as a plastic or fiber • It’s used mostly for applications like outdoor carpet • Also used for dishes

6. Polystyrene • Polystyrene is a vinyl polymer • It has a phenyl group every other carbon atom • In plastic form it’s used for computer shells • In foam form it’s commonly used for packing boxes

7. Poly(vinyl chloride) • Pvc is used for plumbing in homes • Can withstand fire and water • The chlorine atoms will inhibit combustion

8. References • Callister, Material Science and Engineering, 6th edition • School of Polymers and High Performance Materials, The University of Southern MississippiURL: http://www.psrc.usm.edu/index.html AA/EOE/ADAI