Cork Stoppers


Colmated Natural Cork Stoppers

Colmated Cork
Stopper © by APCOR

Colmated corks are natural cork stoppers with their pores (lenticels) sealed exclusively with cork dust, which results from rectifying natural cork stoppers. For the cork dust to adhere to the pores (lenticels), FDA grade natural resin and rubber glues are used, and occasionally in this process, a water-based glue can also be used. Colmation has two essential benefits:

  1. improves the visual aspect of the cork closure,
  2. and it improves its performance.

Colmated cork stopper have a homogenous visual appearance and good mechanical characteristics. They are manufactured in a variety of forms and dimensions. However the most common cylindrical form and sizes are those indicated below (length x diameter), although these may vary according to the manufacturer.






Bordeaux, Burgundy or Rhône type bottle (75 cl) with a CETIE* or Italian specification neck finish


Half bottles with 37,5 cl with the same neck finish



Medium maturation


= Suitable for use / recommended
*CETIE – International Technical Centre fot Bottling and related Packaging

All the variables previously mentioned in the section “Determining Cork Quality” must be observed. Moreover, there is a general classification which divides the cork stoppers into 3 grades (A, B, C or I, II, III), according to the level of colmation. Regardless of this, each manufacturer has specific products that do not integrate any of the above grades.