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8. Removable plastic panels not fastened to the frame or supported on all <br />edges shall be supported on their longest dimension by troughs on two <br />opposite edges. Where such removable panels are made in several sections, <br />the adjacent edges shall be joined together where the adjacent edges ex- <br />ceeds twelve (12) inches in length by fastenings directly supported to the <br />frame of the sign. Such fastenings to be not less than tvielve (12) inches <br />on centers. <br />9. The plastic decorations, faces, panels and letter facings shall either; <br />(a) Be demonstrated to be of sufficient thickness or so formed or <br />supported as to withstand twenty -five (25) pounds uniform load per <br />square foot without coming in contact with gas tubes or any other <br />source of illumination and without coming within two (2) inches of an <br />Incandescent lamp, or <br />(b) Be of a thickness not less than that indicated in the following <br />table: <br />Minor dimension of Minimum nominal <br />Exposed Plastic Thickness <br />Sheet Flat Panels of Plastic <br />12" .060" <br />18" .080" <br />24" .100" <br />3011 12511 <br />48" .187" <br />60" 250" <br />Plastic sign faces, panels, and decorations, the dimensions of which are <br />fixed by reference to this table, shall be so stayed, braced or supported <br />as to prevent contact with gas tubes or any other source of illumination <br />and so as to prevent deflection of a point within two (2) inches of an <br />incandescent lamp. (The dimension between supported edges shall be con- <br />sidered to be minor dimension for purposes of this table.) <br />- 9_ <br />