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IX. THERMAL EXPANSIVITY OF SOLIDS

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<strong>THERMAL</strong> EXPANSION <strong>OF</strong> POLYTHENE<br />

Sources of Data: Laquer and Head 1952. (In addition to<br />

the substances listed in the table, data<br />

have been given for 16 specially compounded<br />

rubbers by Bunsmoor et al. 1958 and Trepus<br />

et al. 1959. These data consist.mainly of<br />

values of (L -L<br />

293 78<br />

Other Re ference s : WOQ~, Bekkedahl and Peters 1939.<br />

Discussion: Polyethylene made by E.I. Du Pont de Nemours<br />

and Co.. Molded under 2000 psi pressure at<br />

l5OoC for 10 min. Directional variations<br />

were negligible. See also Hunter and Oakes<br />

1945. Five filled polythenes were measured<br />

by Head and Laqyer 1952.<br />

remp .<br />

0<br />

K<br />

0<br />

20<br />

40<br />

60<br />

80<br />

too<br />

L20<br />

L40<br />

160<br />

-80<br />

Table of Selected Values<br />

L293 - LT<br />

L293<br />

2449 x 10-5<br />

2439 I1<br />

2404 I1<br />

2349 I1<br />

2279 I1<br />

2194 11<br />

2089 I1<br />

1964 I1<br />

1814 I1<br />

1639 I1<br />

Taken from NBS 29<br />

Temp.<br />

0<br />

IC<br />

200<br />

220<br />

240<br />

2 60<br />

293<br />

2%0<br />

293<br />

298<br />

300<br />

<strong>IX</strong>-R- 7.1<br />

- L<br />

L293 T<br />

L293<br />

1439 10-5<br />

1199<br />

919 'I<br />

594<br />

359 'I<br />

239<br />

0<br />

-131

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