Made of a filled polypropylene called TPR Tetra Box has found commercial applications in Sweden since 1992 but this represents the first use in Germany. The chief advantage of TPR is what Filltech calls its "favorable environmental profile" compared to "corresponding competitive packaging." That is because it substitutes natural minerals for some polymer it requires less energy to produce says Filltech. If incinerated it emits only carbon dioxide and water vapor. Finally says Filltech "pilot recycling studies show promising results." Filltech also describes its moisture and oxygen barriers as more effective than PP polyethylene or polystyrene. In addition to the thermoformed tub and snap-on lid the Munsterland packages have a flexible inner seal also made of TPR. All three components have bright graphics printed offset in six colors by Filltech. Munsterland admits the Tetra Box costs about 20% more than a conventional PP or PE tub but the company is willing to pay the upcharge for a package whose "green" benefits are so appealing. The 500-g (17.65 oz) tubs sell for about 2 DM ($1.35).