We can actually deduce here that the sentence in bold is a detail. It is a detail because it buttresses the special properties of plastic.
What is a detail?
A detail is actually known to be an additional information that talks something. It usually reveals more about something that was previously stated or revealed.
Details usually help one to understand what something is all about. It will help readers or enquirers to discover or identify something more easily and more simply.
We see here that the bold sentence here: "The elements it is made of are combined under heat and pressure" is a detail.
Learn more about details on https://brainly.com/question/2684713
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