The double-layer structure of the patented barrier preforms offers an enormous economic benefit compared to other processes. In order to produce pure white milk bottles, the white pigment titanium dioxide is added to the polymer for the production of the preform. The additive also provides an increased barrier effect against damaging UV light. For single-layer preforms, the proportion must be at least 15% of the preform's entire weight. When using PRELACTIA®, however, the additive is only mixed into the outer layer, which allows the proportion of the additive to be reduced to five percent of the weight of the preform. "In the context of a yearly production of 105 million preforms at 17 grams each, the use of the high-grade titanium dioxide is reduced to around 180 tons. At market prices between €7-8 per kilogram, this results in enormous annual savings. At the same time, the customer benefits from a significantly improved light barrier effect compared to single-layer PET preforms," explained Kleinfeld. Nearly 100 percent of the visible light is reliably blocked. This makes PRELACTIA® particularly well-suited for milk products and milk drinks with a shelf life of up to six months. Since both layers are made from PET, empty PRELACTIA® bottles can simply be put in a regular recycling bin.