| 摘要 |
<p>1. The industrial product which is formed by at least one rigid or semi-rigid hollow container which is closed or which can be closed and which is substantially sealed, having an appreciable level of thermal conductivity, and, in said container, a mixture of substantially eutectic constitution whose eutectic melting point is between -5 and-308C, said mixture containing approximately 30 to 35 % by weight of carbamide and 65 to 70 % by weight of water, and characterized in that it further contains at least one nucleating agent selected from an aluminate, silicate or silico-aluminate of nickel or cobalt of spinel structure.</p> |
