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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.
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Specifications
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Tests |
Characteristcs |
Specifications |
Test method |
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Physical – Mechanical |
Lenght |
± 1,0 mm |
NP 2803-1 |
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Diameter |
± 0,5 mm |
NP 2803-1 |
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Ovality |
< 1,0 mm |
NP 2803-1 |
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Moisture |
4%≤ M ≤ 9% |
NP 2803-2 |
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Extraction Force |
30 ± 10 daN |
NP 2803-4 |
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Capillarity |
≤ 2 mm |
ME 6 |
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Chemical |
Peroxide Content |
≤ 0,1 mg/cork |
NP 4296 /ME 8 |
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Surface Traetment Content (1) |
± 4 mg/cork |
ME 10 |
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Dust Content |
≤ 3 mg/cork |
ME 7 |
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Microbiological |
No. of CFU/cork |
Bacteria < 2 |
NP 3725 |
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Yeast < 2 |
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Mould < 5 |
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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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