: 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.
Many plastic toys are made of polyvinyl chloride (aka PVC or vinyl), a type of plastic that is made with phthalates. Phthalates leach out of various products and into our blood streams, and are implicated in reproductive disorders and respiratory problems. Theyâre also found in some pacifiers, teethers and chew toys.