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

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232 CORK INSULATION<br />

A suitable Asphalt Primer for initial applicati<strong>on</strong> to c<strong>on</strong>- I<br />

Crete and mas<strong>on</strong>ry surfaces as preparati<strong>on</strong> for the erecti<strong>on</strong> of<br />

cold storage <str<strong>on</strong>g>insulati<strong>on</strong></str<strong>on</strong>g> in Asphalt cement, is as follows: i<br />

Asphalt Primer for Use With Asphalt Cement j<br />

The asphalt used in preparing the primer shall be homogeneous i<br />

and free from water, and shall c<strong>on</strong>form to the following requirements:<br />

(a) Melting point (R & B) 140 to 225° F. (60° to 107.2° C.) I<br />

(b) Penetrati<strong>on</strong> at 77° F. (25° C.) 100 grams pressure for 5<br />

sec<strong>on</strong>ds 20 to 50<br />

(c) Flash point (Open Cup).... Not less than 347° F. (175° C.)<br />

(d) Loss <strong>on</strong> heating 50 grams at 325° F. (163° C.) for 5<br />

hours Not more than 1%<br />

(e) Penetrati<strong>on</strong> at 77° F. (25° C.) 100 grams pressure for 5<br />

sec<strong>on</strong>ds, of the residue after heating SO grams at 325' F.<br />

(163° C.) for 5 hours as compared with penetrati<strong>on</strong> of<br />

asphalt before heating Not less than 60%<br />

(f) Ductility at 77° F. (25° C.) Not less than 15 cm.<br />

(g) Insolubles in Carb<strong>on</strong> disulphide Not more than 2%<br />

The solvent used in cutting the asphalt (in preparing the primer)<br />

shall be a hydrocarb<strong>on</strong> distillate having an end point <strong>on</strong> distillati<strong>on</strong><br />

of not above 500° F. (250° C), of which not more than 20 per cent<br />

shall distill under 248° F. (120° C).<br />

The finished Asphalt Primer shall be free from water* and shall<br />

c<strong>on</strong>form to the following requirements:<br />

(a) Sediment* Not more than 1%<br />

(b) Asphaltic base by weight 25 to 35%<br />

101.—Emulsified Asphalt.—Emulsified asphalt and emulsi-<br />

fied asphalt plastic, for the interior finish of cold storage<br />

rooms, and sometimes for the priming of surfaces in prepara-<br />

ti<strong>on</strong> for <str<strong>on</strong>g>insulati<strong>on</strong></str<strong>on</strong>g> to be applied in hot Asphalt cement, has<br />

had enough publicity—favorable and unfavorable—to justify<br />

a very careful look into the general subject of asphalt emul-<br />

si<strong>on</strong>s.<br />

"Colloid chemistry is the chemistry of grains, drops, bub-<br />

bles, filaments, and films," according to Bancroft; but colloid<br />

chemistry actually deals with grains, drops, and bubbles <strong>on</strong>ly<br />

when they are sufficiently small, of diameters ranging from<br />

ICX) millimicr<strong>on</strong>s to 1 milllmicr<strong>on</strong>f, and when such particles<br />

are surrounded by, or dispersed in, some other substance, as<br />

dust in air (smoke), water in butter, oil in water (milk), air<br />

*To test for Water and Sediment, use A.S.T.M. Method D9S-23T.<br />

tA millimicr<strong>on</strong>, 1 /jl/i. is <strong>on</strong>e niillicnth of a millimeter, 100 fi/t just barely being<br />

visilale with the aid ot the best microscope, and the largest molecules approach a<br />

diameter of l nf/i,,

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