About Cork

Cork – Nature's Wonder

Cork is the bark of a special Cork tree cultivated primarily in the area Neighbouring the Mediterranean Sea. This bark is stripped from the cork oak tree once in about 9 years. From this bark are produced wine cork stoppers which have proved their unmatched sealing capability for over a 1000 years. The balance material is ground and graded appropriately to give cork granulates.

Cork is truly compressible, while other material may flow sideways, distort or elongate, cork shows very minimal side flow. This is because of the unique cork cell structure wherein air is entrapped in tiny but flexible walls of the cork cell. When cork is compressed, the air in each cell gets squeezed into smaller spaces, which maintains counter pressure enabling the cork to spring back to original its shape when the force is released, whereas other materials would get distorted. This property continues to remain intact even after several years.

The unique properties of cork, such as true compressibility, low density, flexibility, surface frictional properties, resistance to liquid penetration, low thermal and electrical conductivity, vibration isolation and many more, continue to remain in the smaller granulates of cork and hence its used in the manufacturing of several specialty products.

Cork Oak, showing the dark reddish bark shortly after harvesting
Close-up of the characteristically corky bark
Close-up at the margin of the harvest

Why choose CorkRubber?

Properly engineered, Cork Rubber can resist strong compressive loads with minimal extrusion or lateral flow in a whole host of aggressive environments. During dynamic operating conditions, CorkRubber maintains its superior sealing properties as it does during thermal expansion/contraction and torsion flexing, even over long-term durability cycles. What's more, the cork harvest process is ecofriendly and Cork Rubber products can be recycled.

Advantages

  • Wide range of fluid compatibility (high chemical resistance over long periods)
  • Compressible with negligible lateral flow (low Poisson's ratio by comparison to solid elastomers)
  • Reduces levels of transmitted vibration (acoustic insulation)
  • Excellent conformity with surfaces to be sealed
  • High resistance to compressive loads over long periods
  • Anti-slip and impactresistant (shock absorber)
  • High resistance to abrasion
  • Provides excellent environmental sealing (ozone resistance)