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

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462<br />

CORK INSULATION<br />

temperature and current shall not be recorded until 48 hours after<br />

heat is turned <strong>on</strong> and test begins, in order to insure thorough heat<br />

saturati<strong>on</strong> of calorimeter and test secti<strong>on</strong>s. The durati<strong>on</strong> of actual<br />

test shall be eight (8) hours, during which time temperature and<br />

electric readings shall be made and recorded each hour or more fre-<br />

quently if c<strong>on</strong>sidered necessary. The average of all readings thus<br />

recorded shall be taken as the final result.<br />

4. C<strong>on</strong>ductivity: <str<strong>on</strong>g>Cork</str<strong>on</strong>g> board <strong>on</strong>e square foot in area and <strong>on</strong>e<br />

thickness of <strong>on</strong>e inch (1 in.), shall not transmit heat to exceed 6.4<br />

B.t.u. per degree Fahr. diflferencc in temperature per 24 hours.<br />

5. Weight: The weight of <strong>on</strong>e square foot of this <strong>cork</strong> board<br />

shall be as follow's:<br />

—<br />

'/4 in. thick—4 oz.<br />

^ in. thick— 6 oz.<br />

yi in. thick—8 oz<br />

?4 in. thick—12 oz.<br />

1 in. thick ISyi oz.<br />

1^ in. thick— 1 lb. 5 oz.<br />

2 in. thick— 1 lb. 11 oz.<br />

3 in. thick—2 lb. 7J^ oz.<br />

with a permissible variati<strong>on</strong> allowed in weight of 10 per cent either<br />

above or below the weights given above.<br />

6. Compressi<strong>on</strong> Test: A sample of this <strong>cork</strong> board, two-inches<br />

thick and <strong>on</strong>e-foot square, when subjected to a compressive load of<br />

2,000 lbs. shall not show a decrease in thickness of more than 0.164<br />

inches.<br />

7. Expansi<strong>on</strong> Test: Representative samples of the <strong>cork</strong> shall be<br />

submerged in boiling w'ater at atmospheric pressure for three hours<br />

without disintegrating. Immediately up<strong>on</strong> removal from the boiling<br />

water, samples shall be measured for lineal expansi<strong>on</strong>, which shall<br />

not exceed two per cent in any directi<strong>on</strong>. The pounds of water re-<br />

tained in <str<strong>on</strong>g>insulati<strong>on</strong></str<strong>on</strong>g>, after being boiled three hours and then drained<br />

twenty-four (24) hours, shall not exceed 12 per cent of light weight<br />

of sample.<br />

8. Dimensi<strong>on</strong>s : The material will be furnished to the dimensi<strong>on</strong>s<br />

specified <strong>on</strong> order and will be cut perfectly square and true to dimensi<strong>on</strong>s.<br />

9. Permissible Variati<strong>on</strong>s: The thickness of the material shall<br />

be determined by placing a sample between two flat smooth boards<br />

or plates, at least 6 in. wide, the ends of which shall project about<br />

Ys in. bey<strong>on</strong>d the edge of the <strong>cork</strong> board. Up<strong>on</strong> hand pressure being<br />

applied to the top board or plate, the measurement as taken between<br />

the inner faces of the two boards or plates between which the<br />

sample is compressed, shall not be more than ^-2 in. per inch over<br />

or under the thickness specified. It is desired, however, to secure<br />

the material to the exact thickness specified.<br />

J

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