NATUR SP has excellent properties thanks to the high-quality slow-growing "Delago" bark, from which
the stopper is cut out. Multiple tests have shown TCA content below 0.5ng/l, which is human
a value undetectable by the senses (for ordinary natural corks, the limit is 2ng/l). The biggest
the advantage of the plug is the elimination of the percentage of problematic NATUR plugs (2–4%), which
so far it has not been possible to exclude from the production process, i.e. no cork aftertaste.