: an isomer that is a stereoisomer of a compound having two or more chiral centers and that is not a mirror image of another stereoisomer of the same compound â
A compact disc is a deceptively simple looking device considering the technology required to make it. 1  CDs consist of three layers of materials: 2  A base layer made of a polycarbonate plastic. 3  A thin layer of aluminum coating over the polycarbonate plastic. 4  A clear protective acrylic coating over the aluminum layer.
Compostable Plastic World Centric Â® compostable plastics are made from Ingeoâ¢, a bio-based plastic derived from renewable corn in the U.S. Chemically, this material is known as PLA, or Poly Lactic Acid, which can be derived from a variety of plant-based starches.