In 2002 AWRI conducted an independent closure trial which included natural corks coated with the ProCork semi-cystalline membrane designed to control OTR (Oxygen Transmission Rate) and block taints. Seventeen years later some cartons of the trial wine were found at the back of a cellar carefully stored in laydown packs. Inside were four natural cork bottles and 12 ProCork bottles.


The visual results are a dramatic demonstration of the consistency and oxygen control provided by the ProCork membrane natural cork.

ProCork bottles on the left and cork bottles on right

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