Wide Mouth Heat Set (WMHS) Technology
Constar is pleased to introduce a new retailer and consumer-pleasing package for hot-filled foods: wide mouth heat set PET jars. Lighter in weight than traditional glass-based packaging and unbreakable in manufacturing, distribution, stores and homes, Constar&rsquot;s wide mouth heat set PET jars deliver the clarity, performance and sustainability food and beverage companies demand, while enabling them to meet packaging reduction goals.
Employing Vertical Compensation Technology™ (VCT™) or X4™ geometry, WMHS PET jars have a robust structure which feels sturdy in-hand and is closer in feel to glass than traditional vacuum panels. This unique geometry employs an innovative panel-less structure to compensate for high temperature filling and processing. With VCT™, the jars flex vertically to compensate for the vacuum created in the hot fill process. With X4 technology, jars will flex at the base.
Fresh Tastes Best
Constar’s food jars offer best-in-class monolayer barrier technologies that take PET to the next level, resulting in high-barrier packages that keep foods fresher, better tasting and visually pleasing longer. Customers choose from Constar’s monolayer barrier technologies, MonOxbar® and DiamondClear®, for the freshest flavor, aroma and color and the desired shelf-life requirements.
Designs You Want
Using CONSTruct™ engineering and design software, Constar creates exactly what you want, from traditional round jars to custom shapes in far less time. Designs are available without obtrusive geometry like traditional vacuum panels, enabling better product evacuation and providing a true glass look. Our CONSTruct™ software enables us to optimize weight while maximizing performance. A 24-ounce wide-mouth hot-fill PET jar weighs less than one-eighth of the weight of glass and remains a robust performer.
An Overachiever
Constar’s wide mouth heat set jars deliver high performance and value. Our PET jars offer a highly efficient footprint in a retailer preferred format. The lightweight, no-break design also makes them the perfect choice for multi-packs, which helps build greater sales.

