Ebrocork receives the cork stoppers after they have overcome, in origin, the various controls of validation required by Ebrocork, while the various stages of preparation and boiling the bark and blanking plates. Once on the ground of Navarre warehouse, they go through rigorous internal and external controls of humidity, density, microbiological, waste oxidizers, powder residue, capillarity, Organochlorine, etc.

Having overcome all those controls, cork stoppers are buried in the warehouse until to initiate the different finishing processes before being served to our customers.

Selection of the cork stoppers

Before printing and delivering the cork stoppers to customers, we make two selections to them already washed and stabilized:

A first selection with electronic machines of optical proceeding, where the cork stoppers are classified by the number and size of lenticels both in body and in the heads of them.

A second visual selection more thorough done by skilled personnel and rotating tapes which run the cork stoppers, rejecting all the defective that could create a problem in closing the bottle. This process is followed for the removal of broken corks stoppers, very porous or with major defects, which do not meet the quality that is being selected, thus achieving very homogeneous qualities at all times.

Covering anti capillary

Part of the different processes that are applied to the cork stoppers to give the ideal characteristics in terms of the virtues that then will require from them.

The anti capillarity treatment is to applying a polymeric covering to the surface of the cork stopper to prevent capillary liquid evolutions.


The printing of the cork stoppers can be at fire or ink.

When the customer orders to print on the heads of the cork stoppers, this process must necessarily be at fire, for it Ebrocork has a printing system on both body and heads made by resistances that achieves a great fidelity and image accuracy. Actually, this is the technology more precise in the market of the cork stoppers.

For ink printing on the cork stoppers alimentary inks are used that comply with the characteristics of composition and organoleptic of the wine and comply with European Regulation for food contact materials.

Surface treatment (paraffin and silicone)

Last industrial processes made on the manufactured cork stoppers are intended to apply surface treatments to lubricate the cork stopper and facilitate the compression in the jaws of the bottling machine and its introduction into the bottle, and its later removal.

The objectives of the surface treatment are:

Lubricate the surface of the cork stopper

Ease the cork stopper glide in the jaws of the bottler and the introduction into the neck of the bottle

Facilitate the uncork being able that the extraction force is adequate

Improve the gases and liquids tightness

A good surface treatment ensures that the cork stoppers are not permeable and do not present capillarity.

The products used are those recommended by the European Cork Federation (CE-LIÈGE) and listed in the International Code of Practices Cork Stopper Manufactures: paraffin and silicone elastomers.

Control of finished product

The Certification ISO 9001:2008 and the SYSTECODE PREMIUM Certificate granted by Ce-Liège confirms the ability of a company on detecting any non-conformity of the product. This requires monitoring the quality of raw materials, manufacturing processes and final treatment, storage conditions and the product’s deliveries. The Quality Management System derived from the commitment made by the Certification becomes on the inspections and tests throughout the manufacturing process until the product is delivered to the customer.


Controls that are made can be classified into three types:

Mechanical Methods

Microbiological Methods

Chemical Methods


Measuring the dimensions, humidity and apparent density of the cork stopper

Humidity measurement

Capillarity and tightness test

Diametrical recovery of the cork stopper

Extraction force

Powder content of the cork stoppers (colmated)

These tests are made according to UNE 56921, 56922, 56924, and 56926, naturally with special equipment capable of reproducing the real conditions in which we wish to make the respective checks.


This objective is the count of aerobic bacteria mesophilics, filamentous fungus and yeasts present on the surface of whole cork stoppers, treated or untreated, that is, so of the raw material or of the finished product. The microorganism count we use various culture media, Tryptone, Soy Agar and Rose Bengal / Saboraud respectively, according to the Norm UNE 56921, 56922, 56924, and 56926.


Mainly consist of:

Oxidants residues test, to analyze the washing residues of different oxidizing compounds using a reflect metric technique

Analysis of organochlorine compounds belonging to the family of chlorophenols and chloroanisoles through gas chromatography