plastic - Major ingredient – Oil– Price increase...

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    Plastics 7 th  Grade Technology Education
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    History of Plastic Invented – John & Isaiah Hyatt –1868 $10,000 prize to replace ivory billiard balls Early uses 1920-40 (few) WWII – parachutes, life rafts, ropes, & plane,  shell, grenade parts Today – almost everything has plastic Replaces wood, clothing, metal parts of objects
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    Uses of Plastic Can be sawed, surfaced, drilled, & sanded Replaces wood for: Clothing- Nylon  Polyester Metal –   Automobile  – 350 + parts Refrigerator – 25 pounds of plastic Space vehicles Boat & car bodies - fiberglass
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    Definition of Plastic Any of a various nonmetallic, synthetic  compounds that can be molded & hardened
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Unformatted text preview: Major ingredient – Oil– Price increase Plastic memory – it will try to go to original state Temperature – change the strength heat Plastic Resists electricity & water High impact & tensile strength High resistance to weather Some have high resistance to heat Types of Plastic Thermosetting – Plastics that harden after being heated & can’t be softened & reused Like cement Teflon for pots & pan handles Thermoplastic – plastics that soften upon reheating & harden when cooled Reheated, softened, & reshaped Like candle wax Acrylic for picture fames...
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  • Winter '09
  • Grade Technology Education, ivory billiard balls, plastic Space vehicles, Price increase Plastic, candle wax Acrylic

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