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

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174 CORK INSULATION<br />

85.—C<strong>on</strong>venient in Form and Easy to Install.—The stand-<br />

ard sheet of pure <strong>cork</strong>board, 12 inches wide and 36 inches<br />

l<strong>on</strong>g", which all American and most foreign manufacturers<br />

follow as a standard, is the most c<strong>on</strong>venient in form for every<br />

purpose. It may be handled, sawed, and applied as readily<br />

as lumber, or put up in Portland cement or hot asphalt cement<br />

with the same ease as any comm<strong>on</strong> building material. Its<br />

characteristics are such that there need be little, if any, waste<br />

from sawing and fitting-, because the fracti<strong>on</strong>al sheets may be<br />

neatly and tightly assembled to give as efificient an installati<strong>on</strong><br />

as could be had with the full size standard sheets.<br />

FIG. 50.—APPARATUS FOR SIMPLE FIRE TEST ON PURE CORKBOARD.<br />

86.—A. Fire Retardant.—In the manufacture of pure <strong>cork</strong>board,<br />

partial carb<strong>on</strong>izati<strong>on</strong> of the raw <strong>cork</strong> bark is accom-<br />

plished without destructi<strong>on</strong> of tissue, that is, the baking proc-<br />

ess, at moderate temperatures, dissolves the resins (inherent<br />

in <strong>cork</strong> bark) sufficiently to everlastingly bind the particles<br />

into a good, str<strong>on</strong>g sheet of <str<strong>on</strong>g>insulati<strong>on</strong></str<strong>on</strong>g>, while at the same time<br />

producing a protecti<strong>on</strong> of carb<strong>on</strong> that a flame penetrates with<br />

much difficulty.<br />

A simple experiment to show the slow-burning and fireretarding<br />

properties of pure <strong>cork</strong>board as compared with other<br />

materials can be made by any<strong>on</strong>e by means of an ir<strong>on</strong> rack<br />

and a gas burner. Place the sample of <str<strong>on</strong>g>insulati<strong>on</strong></str<strong>on</strong>g> <strong>on</strong> the rack<br />

and record the time it takes to burn a hole clear through and<br />

- 1<br />

i

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