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diam classic range

Diam, our technological cork for still wines.
Diam is the only cork closure that provides both a perfect homogeneity between one bottle and another and perfect control over the different levels of permeability. The DIAMANT® method also provides incomparable sensorial neutrality.  
Tested and approved by many international laboratories, Diam is an innovative closure that combines the tradition of a cork stopper and the mechanical and organoleptic security of a technological closure: 

TCA taint-free (below the limit of quantification of 0.3 ng/l) and many other molecules responsible for sensorial deviations.

Optimum bottling line (insertion) performance and unsurpassed elastic recovery.
Prevents leakage, seepage, or dust risk.  
By preserving the wine’s aromas throughout its maturation, Diam is the closure of choice for a successful tasting experience every time!   

Diam comes in 5 different permeability types—see the Technical Specifications Table below and downloadable data sheet. 


44x 23.5mm, unbranded, traditional.
Available in bags of 1000

diam 3 cork, 44mm

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44x 23.5mm, unbranded, traditional.
Available in bags of 1000

diam 5 cork, 44mm


diam altop for wines and spirits

Technical Information:

Ideal for spirits thanks to its outstanding mechanical properties and releasable TCA below 40 ng/l in 40% ethanol solution.

Thanks to unique manufacturing process and stringent testing at all stages of production, every Diam Altop cork provides consistent guarantee of individual performance:


  • Consistency from one bottle to the next and over time

  • Consistent bottling leading to optimized productivity and reduced costs

  • Regularity of line behavior

  • High elastic return

  • Controlled and consistent permeability

Diam Bouchage provides a complete service from design to realization (cork shanks production, top sourcing and assembling) and offers its customers numerous options for customizing their closures (diameter, marking, heads in wood, metal, plastic or glass).


Altop Technical Cork comes in two styles—see the technical information sheet for details.

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The Diam Classic line includes: 

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