The SHM CD (short for Super High Material Compact Disc) is a compact disc in which the conventional polycarbonate carrier has been replaced by an alternative material. This material was invented in 2006 by Universal Music Japan and JVC in an attempt to produce particularly transparent LCDs.
The manufacturer sees advantages that would already be noticeable when casting the modified polycarbonate. For example, the liquid material can be applied more precisely to the stamper, and jitter is also reduced when reading CDs.
SHM CDs can be played in any conventional CD player because the devices adapt to the transparency of different materials and the same error correction can be used as when playing polycarbonate CDs.