CDs are made up of 99 percent transparent polycarbonate material. The remaining 1% of the disc is made up of the reflective layer, protective layer, and screen print. Polycarbonate is a clear, durable plastic that allows light to pass through it. It can be colored or left white like glass.
CDs use laser technology to read information stored in pits located in the surface of the disc. These pits contain mixtures of sand and metal particles that reflect light back when played back using proper equipment. Before a CD can be manufactured, data is first written to the blank disc using a laser beam. This process creates patterns of pits that store information when played back using a compatible player. New technologies have been introduced that allow for greater storage capacity to be placed on a single disc. For example, Blu-ray discs contain higher quality video than traditional CDs and enable the storage of more than four times as much data.
Polycarbonate is a common ingredient in many other products such as plastic bottles, computer monitors, and eyeglasses. It can also be found in some jewelry made from sterling silver.
There are several different methods used to create CDs. One method requires placing a liquid plastic compound into a mold and then heating it until it solidifies.
In reality, a CD is almost entirely made of polycarbonate plastic. A CD's surface is reflective because the disc is covered with a small coating of aluminum or, in some cases, gold. The gleaming metal coating reflects the laser needed to read or write data to the gadget. Without this metal coating, the laser would pass right through the plastic and out the other side.
The aluminum used to coat the discs comes from aluminum cans. When burned, the plastic inside the can melts and flows together into a smooth layer on the outside. The aluminum stays solid, so it doesn't burn up when the disc is played back in the player.
Although plastic has become the favorite material for compact discs, they used to be made of vinyl. Like a record, a vinyl disc has grooves that hold the music within its surface. The difference between the two materials is that records play one song after another, while CDs can store many songs on one disc. This means that you can take your collection with you wherever you go!
Vinyl is a form of plastic. It is made by melting fat and wood pulp with sulfuric acid and sodium sulfite. As the mixture cools, it forms rods that are stretched and hardened into shape. These rods are cut into singles (the individual songs) or stacked together to make an album.
The first CDs were actually audio tapes.
CDs are made up of three layers of material: A polycarbonate plastic base layer Over the polycarbonate material is a thin layer of metal coating. Over the metal layer is a transparent, protective acrylic covering. The metal layer can be aluminum or gold, but it can also be silver or black. The plastic layer must be clear so that when you put text on the CD there will be no background color to distract readers.
Acrylic is a hard, lightweight material that is used for manufacturing glass containers. It is shatterproof and extremely durable. These qualities make it ideal for applications where quality and durability are important. Acrylic does not emit gases, so it's safe for food products and other items that might be kept in your home library for entertainment purposes.
It's commonly believed that CDs are made from plastic, but they're actually made from polycarbonate carbonate material. Polycarbonate is a tough, clear plastic used in things such as drinking bottles and computer parts because of its resistance to impact damage. Carbonate refers to a class of chemical compounds containing carbon, oxygen, and hydrogen atoms bonded together. Polycarbonates are generally transparent, but they do come in various colors if desired. They can be blue, green, or red depending on how the dye is added during production.
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