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- Raw materials are selected according to rigorous physical criteria.

- The cork planks are boiled in a new generation stainless steel boiler with a continue water filtration system and “flash détente” column.

- Vapour-extraction treatment.

- Traditional peroxide cleaning system.

- Physical and chemical controls in all production steps.



Taille standard : 24 x 44mm, 24 x 49mm, 24 x 54mm

Gamme :  Extra, Classe 1, Classe 2, Classe 3, Classe 4


Characteristics Technical specifications
Tolerances
Superior range Standard range Basic range

Visual characteristics (for 125 stoppers)

≥ 90% of the asked choice < 10% of the inferior choice < 10% of the inferior choice < 10% of the inferior choice
Dimensional characteristics (for 32 stoppers)

Length (mm) L + 1,0

Diameter (mm) D ± 0,5

Ovalization (mm) ≤ 0,7

Chamfer (mm) 1,5±0,5

NQA 4 (A3/R4**)

NQA 2,5 (A2/R3)

NQA 4 (A3/R4)

NQA 4 (A3/R4)

NQA 4 (A3/R4)

NQA 4 (A3/R4)

NQA 6,5 (A5/R6)

NQA 4 (A3/R4)

NQA 6,5 (A5/R6)

NQA 6,5 (A5/R6)

NQA 6,5 (A5/R6)

NQA 6,5 (A5/R6)

Physical and chemical characteristics Humidity (%) 6,0 ± 2,0 NQA 4 (A2/R3) NQA 4 (A2/R3) NQA 4 (A2/R3)
Dimensional (%) 100%>90% 100%>90% 100%>90%
Capillarity No capillary ascent No capillary ascent No capillary ascent
Liquid watertightness (%) 100% >1,2 bar 100% > 0,9 bar

100% > 0,6 bar

Extraction force (daN) 15<100%<40 15<100%<40 15<100%<40
Peroxide residual (mg/stopper) ≤ 0,1 ≤ 0,1 ≤ 0,1


Length (mm) L ± 0,7

Diameter (mm) D ± 0,5

Ovalization (mm) ≤ 0,7

Chamfer (mm) 1,5±0,5

NQA 4 (A3/R4**)

NQA 2,5 (A2/R3)

NQA 4 (A3/R4)

NQA 4 (A3/R4)

NQA 4 (A3/R4)

NQA 4 (A3/R4)

NQA 6,5 (A5/R6)

NQA 4 (A3/R4)

NQA 6,5 (A5/R6)

NQA 6,5 (A5/R6)

NQA 6,5 (A5/R6)

NQA 6,5 (A5/R6)