plastics

Topics: Plastic, Epoxy, Thermosetting polymer Pages: 6 (1759 words) Published: November 7, 2014
plastic-def.
A plastic material is any of a wide range of synthetic or semi-synthetic organic solids that are moldable. Plastics are typically organic polymers of high molecular mass, but they often contain other substances. They are usually synthetic, most commonly derived from petrochemicals, but many are partially natural.

Plastics Characteristics
Plastics are made from fossil fuels--petroleum, natural gas, coal--, wood and some plant materials, air, water and sometimes other common materials. They are designed in many different formulas for different purposes. There are two main types: Thermoplastics soften when heated, harden when cooled, so caution is required in use. Examples are: Acrylic, Cellulosic, Nylon, Polyethylene, Polystyrene, Polypropylene, and Vinyl. Thermosetting plastics are set into permanent shape with heat. They do not soften when reheated. Examples are: Phenolic, Melamine, Urea and Thermoset Polyester. Properties of basic plastics resins can be changed by adding fillers, plasticizers, or stabilizers. Examples are: Polystyrene, which cracks easily, can be made to resist impact by addition of rubber modifiers; Polyester resin, reinforced with glass fibers, makes durable products such as shower stalls or boats. Plastics may be shaped by molding, casting extrusion, calendaring, and foaming. Examples are as follows: Molded-dishes, furniture

Cast-furniture, cutlery handles
Laminated-materials for counter tops, furniture
Extruded-fibers
Calendared-plastic film, plastic-coated fabric
Foamed-upholstery foam, sponges

The Uses of Plastics
Whether you are aware of it or not, plastics play an important part in your life. Plastics' versatility allow it to be used in everything from car parts to doll parts, from soft drink bottles to the refrigerators they are stored in. From the car you drive to work in to the television you watch when you get home, plastics help make your life easier and better. So how is it that plastics have become so widely used? How did plastics become the material of choice for so many varied applications? The simple answer is that plastics are the material that can provide the things consumers want and need. Plastics have the unique capability to be manufactured to meet very specific functional needs for consumers. So maybe there's another question that's relevant: What do I want? Regardless of how you answer this question, plastics can probably satisfy your needs. If a product is made of plastic, there's a reason. And chances are the reason has everything to do with helping you, the consumer, get what you want: Health. Safety. Performance. Value. Plastics help make these things possible. Shopping

Just consider the changes we've seen in the grocery store in recent years. Plastic wrap helps keep meat fresh while protecting it from the poking and prodding fingers of your fellow shoppers. Plastic bottles mean you can actually lift an economy-size bottle of juice. And should you accidentally drop that bottle, it's shatter-resistant. In each case, plastics help make your life easier, healthier and safer. Grocery Cart Vs. Dent-Resistant Body Panel

Plastics also help you get maximum value from some of the big-ticket items you buy. Plastics help make portable phones and computers that really are portable. They help make major appliances - such as refrigerators or dishwashers - resist corrosion, last longer and operate more efficiently. Plastic car fenders and body panels resist dings, so you can cruise the grocery store parking lot with confidence. Packaging

Modern packaging -- such as heat-sealed plastic pouches and wraps -- helps keep food fresh and free of contamination. That means the resources that went into producing the food aren't wasted. It's the same thing once you get the food home -- plastic wraps and resealable containers keep your leftovers protected. In fact, packaging experts have estimated that each pound of plastic packaging can reduce food waste by up...
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