Context: Replicated CDs are mass-produced initially using a hydraulic press. Small granules of heated raw polycarbonate plastic are fed into the press. A screw forces the liquefied plastic into the mold cavity. The mold closes with a metal stamper in contact with the disc surface. The plastic is allowed to cool and harden. Once opened, the disc substrate is removed from the mold by a robotic arm, and a 15 mm diameter center hole (called a stacking ring) is created. The time it takes to "stamp" one CD is usually two to three seconds.

Question: How are CDs mass produced?
Answer: hydraulic press

Question: What type of material is used to make CDs?
Answer: raw polycarbonate plastic

Question: What size is the diameter of the center hole in a CD?
Answer: 15 mm

Question: How long does it take to stamp out one CD?
Answer: two to three seconds

Question: What is the term for the center hole in a CD?
Answer: stacking ring

Question: How large is the screw that forces the plastic into the cavity?
Answer: Unanswerable

Question: How long does it take the plastic to cool?
Answer: Unanswerable

Question: What is the robotic arm called?
Answer: Unanswerable

Question: What is a hydraulic press made out of?
Answer: Unanswerable

Question: What closes the mold?
Answer: Unanswerable