Once the raw corks from Portugal have arrived in Trier, we first check their visual quality. After thorough mixing of a batch during washing, a random sample of at least 400 corks is taken to check the sensory quality.
Using a non-impairing (damaging) extraction method developed in-house along with state-of-the-art gas chromatography, we determine the levels of trichloroanisole (TCA). In parallel, the corks are sniffed to detect further possible off-flavors.
PLUS and EcoQork:
Reliable qualities for the basic segment of your wines
In a sample of 400 corks, a maximum of 5 corks may have an elevated TCA content. This means that on average there are less than 2% defects (belastete Korken) in a lot rated as Plus or EcoQork.
TOP and OrganiQork:
Increased safety for high quality wines
In a sample of 400 corks, a maximum of 2 corks may have an elevated TCA content. The risk of cork taint in the Top and OrganiQork quality grades is on average less than 1%.
Best protection for premium wines
In contrast to the sensory classes mentioned above, in this quality grade all corks are analyzed for their TCA content, and contaminated corks are rejected—providing the highest possible degree of safety.