Mylar

Instead of canvas, solar sails are made of thin sheets of Mylar, the same crinkly silver material often used for helium-filled balloons.

The heavy use causes the mylars to develop extensive local warping […]

In the far infrared a self-supporting layer, such as a sheet of mylar stretched over a plane circular surface, is widely used.

This table provides the value of alphanumeric coded ceramic, mylar and mica capacitors […]