Natural Corks

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Product Type:
Natural Corks
M. A. Silva offers nine natural cork grades ranging from near visually perfect for ultra-premium wines through value priced corks intended for high-volume labels. To compliment your bottle, label and capsule selection, each grade is available in three washes.

Colmated Natural Cork
A challenge for some winemakers is achieving a specific price point while maintaining the attractiveness of a natural cork closure. Colmated corks allow wineries to take advantage of the consumer preference for natural cork, while reaching lower price points competitive with synthetic stoppers and screw caps. "Colmate" means to fill or cover. For colmated corks, we use fine granular cork to fill voids and improve the appearance of a lower grade natural cork body. See how we make colmated corks.
Colmated natural corks are offered in a 1 3/4” standard length (24 x 44mm), plus custom sizes and washes.

Natural wine corks are preferred for all types of wine, aging periods and bottle formats. No other natural product offers this combination of visual appeal, neutrality and consistent sealing qualities.

Sizes, Grades and washes
Natural corks are offered in multiple standard lengths, nine visual grades, and multiple washes. Custom sizes are also available.

Technical Specifications

Length: Nominal ± 1.0 mm
Diameter: Nominal ± 0.5 mm
Ovalization: <1.0mm

Moisture: 4%-7% moisture content
Dimensional Recovery: >96%
Density: Nominal ± 40 Kg/m3
Resistance to boiling water: No disintegration

Extraction Force: 15 daN – 45 daN (coated corks only)
Sealing Ability: No leakage at 1.2 bar
Capillarity: <1 mm

Use before: 6 months
Storage humidity: 40% - 70% RH, non-condensing
Storage temperature: 15ºC - 20ºC, 59ºF - 68ºF
Location: Store in a clean, well ventilated, odorless place away from chlorine products.

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