A form of polyester resin used to make heat-resistant plastic films and sheets.
- If they are sleeved in plastic, be sure it is not PVC plastic (look for Mylar or polypropylene).
- A balloon constructed of a tough polyester film called Mylar will deliver her to the edge of space.
- It has an optical quality far better than other materials, such as Mylar or polypropylene, that are typically used in laboratories.
1950s: an arbitrary formation.
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