Engineering Materials
Amorphous material is one

In which atoms align themselves in a geometric pattern upon solidification
Which emits fumes on melting
Which is not attacked by phosphorous
In which there is no definite atomic structure and atoms exist in a random pattern just as in a liquid

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Engineering Materials
Thermoplastic materials are those materials which

Are used as a friction lining for clutches and brakes
Are formed into shape under heat and pressure and results in a permanently hard product
Are flexible and can withstand considerable wear under suitable conditions
Do not become hard with the application of heat and pressure and no chemical change occurs

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