Expanded Cork Board Insulation
This information reflects our best understanding of product composition in 2016.
Cork insulation boards are made by exposing cork granules to super-heated steam in a block-shaped press mold. The super-heated steam causes the cork pieces to swell and expand, but because their movement in the press mold is limited, the granules...
Cork insulation boards are made by exposing cork granules to super-heated steam in a block-shaped press mold. The super-heated steam causes the cork pieces to swell and expand, but because their movement in the press mold is limited, the granules are forced together under pressure. Suberin, a waxy resin naturally present in cork, is activated by the steam and pressure, and acts as a binder between the now expanded granules. After the molded blocks are cooled, they are cut into slabs of varying thicknesses. No flame retardant or antimicrobial additives are necessary.