compressed cork

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Cork granules molded to shape, compressed, and baked in a rectangular block or board shape or sheet form; usually 6 to 12 lb per cu ft (96 to 192 kg per cu m) in density; used for thermal insulation and vibration control.
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The main bulk is clad in compressed cork blocks apparently assembled like masonry, and waterproofed with a compound that colours them a strong brown-black.

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