Exam #3 Study Guide MC251

Exam #3 Study Guide MC251 - Exam #3 Plastic: Two categories...

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Exam #3 Plastic: Two categories of plastics: -Thermoforming- materials become soft when heated and solid when cooled to room temperature. The softening and setting may be repeated many times -Thermosetting- materials may not be reheated and softened again, once the structural framework is set, these plastics cannot be reformed; (similar to casting of cement) Common elements: -Thermal conductivity- poor heat conductors, -Electrical insulation- good electrical insulators -Low specific gravity -Low coefficient of friction -Colors can be added -Transparent -Water resistant -Chemical resistance -Hygienic and Non-allergenic -Ease of mass production Effects of UV: Plastics degrade or break down over time when exposed to UV light Plastics are: -Normally synthetic or natural -Normally organic -A high molecular weight material -solid in its processed and unprocessed form -softened when formed Thermoforming Plastics: -Acrylic, acetal, ABS, flouroplastics (teflon), Cellulose, polyethylene, polypropylene, vinyl,
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Exam #3 Study Guide MC251 - Exam #3 Plastic: Two categories...

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