The ThermaSet line substantially increases PET’s glass transition point and provides less than 1% shrinkage, The line also yields an incremental improvement in barrier, and an additional barrier option to meet more challenging product performance objectives. It also offers good clarity, and a base which has been specially designed to absorb pressure and vacuum. This feature helps minimize distortion during cooling. Five stock designs are available—18-, 24-, 32-oz. round and 45- and 48-oz. "grip" jars. Custom jars are also available.