CYANAMID — MANUFACTURE, CHEMISTRY AND USES IO5 



serted so that its bulb was within and near the center of the 

 oiled cotton. Observations were made to note if any differ- 

 ence between the temperature of the sample and the water- 

 bath occurred. 



"The internal temperature of the test sample remained 

 slightly below ioo° C. during the first 5 hours of heating, and 

 never exceeded icx)^ C. the temperature of the surrounding 

 bath." 



"General Behavior when Treated with Water. — A stream of 

 water at about 75 pounds pressure from a ^ inch nozzle was 

 applied to a bag for 15 minutes, the stream being directed so as 

 to wet the entire external surface of the bag. The bag was 

 then allowed to stand about a week, and an average sample was 

 analyzed according to the method of Gunning. 



"The sample did not readily absorb water, owing to the 

 presence of oil which retarded immediate contact of the water 

 with the lime-nitrogen compound. Water was, however, 

 gradually absorbed with a very slow evolution of gas in small 

 quantity. A marked odor of ammonia was noted. When 

 allowed to dry in air, the sample hardened to some extent, or 

 in other words 'caked.' This 'caking' was in a measure due to 

 absorption of carbon dioxide from the air. 



Per cent. 



Nitrogen in sample before wetting 14.44 



Nitrogen in sample after wetting 13. 10 



Apparent loss of nitrogen 1.34 



The following conclusions were drawn with regard to the 

 fire and water hazard of Cyanamid : 



"It is readily decomposed by high temperatures, and also by 

 mineral acids which attack it somewhat violently with the 

 evolution of considerable heat. Its decomposition by water is 

 not accompanied by a material rise in temperature or the 

 formation of hazardous products in dangerous quantity. It is 

 not liable to spontaneous ignition. 



"The product is non-flammable, and is not combustible to 



