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Natural Corks
rolha_natural.jpg

Natural Corks

Stoppers that are directly punched from the cork bark and that, of this way, are 100% natural.

They are made in several measures but the most common ones are the following :  45x24mm, 38x24mm, 38x22mm and 33x21mm.

Nevertheless, there is a strong trend towards the use of 49x24mm, 45x25mm and 38x25mm.

About the qualities, these are classified as Extra, Superior, 1st, 2nd and 3rd

Specifications

Tests   

Characteristcs

Specifications

Test method

Physical – Mechanical

Lenght

± 1,0 mm

NP 2803-1

Diameter

± 0,5 mm

NP 2803-1

Ovality

< 1,0 mm

NP 2803-1

Moisture

4%≤  M ≤ 9%

NP 2803-2

Extraction Force

30 ± 10 daN

NP 2803-4

Capillarity

≤ 2 mm

ME 6

Chemical

Peroxide Content

≤ 0,1 mg/cork

NP 4296 /ME 8

Surface Traetment Content  (1)

± 4 mg/cork

ME 10

Dust Content

≤ 3 mg/cork

ME 7

Microbiological

No. of CFU/cork

Bacteria < 2

NP 3725

Yeast < 2

Mould < 5

Visual

Visual Grade

Reference ± 5%

NP 2922

(1) The quantity of surface treatment applied varies according to the type of treatment and final use of the cork.

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