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Cork insulation; a complete illustrated textbook on cork insulation ...

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14 CORK INSULATION<br />

seas<strong>on</strong>ing preliminary to being boiled. The outer surface of<br />

<strong>cork</strong> bark is rough and woody and c<strong>on</strong>tains c<strong>on</strong>siderable grit,<br />

due to its l<strong>on</strong>g exposure to the elements. After boiling, this<br />

"hard-back," as it is called, is readily scraped ofT; but since the<br />

weight is thereby reduced about twenty per cent, and <strong>cork</strong>wood<br />

is sold by weight, it is the tendency to want to slight<br />

this operati<strong>on</strong>. The same boiling process removes the tannic<br />

acid, increases the volume and the elasticity of the bark,<br />

renders it soft and pliable and flattens- it out for baling after<br />

pPHRT^^P^ ',"<br />

vi""''

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