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Additional resources for Fire Retardant Paints (Advances in Chemistry Series 009)

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The panels were than re­ moved and'dried at 120* F. for 72 hours before being submitted to the burn test. This test was considered important i n the prediction of the effect of washing on an interior paint and it is obvious that the effect of r a i n f a l l should be predetermined on an exterior paint. T e n t y p i c a l pigments and /or extenders have been tested i n an alkyd v e h i c l e i n both the presence and absence of chlorinated paraffin. These results were determined at pigment loadings of 40% and 60% P V C .

Char V o l . , C u . 31 Average Char V o l u m e C u . Inches 60% PVC 40% PVC A v . Char Area, Sq. 6 60% PVC of Study Average Wt. Loss I. A v . Wt. ch006 > 3 ο S H H g 5 w α Q ^ 2 α > 39 M U R R A Y , ET A L . — F O R M U L A T I O N OF FIRE-RETARDANT PAINTS intumescent agents. To accomplish this, relatively low concentrations of silicone resin were used. The result is demonstrated by reference to the washability values for formulations for interior paints 1,2, and 3. 5% s i l icone withstood 1436 strokes; interior paint 2 with 30% silicone took 2275 strokes.

Ch005 restricts the rate of accumulation of test data by this method. In spite of this, c l a s ­ sifications by this method are being incorporated i n various building codes. Factory M u t u a l Room Burn Out Test. This method involves the use of a special test room. The particular one referred to is located at Factory Mutual Laboratories, Norwood, Mass. It is 14 χ 20 feet i n area and 12 feet high, constructed of spruce studs and roof joists, with a floor of Douglas fir sheathing on spruce runners l a i d on a concrete floor underneath.

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