Commonly known as PETG, Durr-Plex or Vivak™ . This material remains amorphous, clear and virtually colorless even in very heavy sections. It has high stiffness and hardness and good toughness. These qualities make this material a good choice for check sockets. Durr-Plex can be easily spot heated with a heat gun and modified easily during the fitting process. Typical shrinkage is 0.5 percent to 0.75 percent.