| 摘要 |
<p>PURPOSE:To provide a cheap and safe heating compsn. contg. iron powder, carbon powder, NaCl and water which are easily available in our daily living environment. CONSTITUTION:To above 30, pref. 50-300 mesh iron powder are added 0.1-20 wt% of 50-400 mesh carbon powder and 1 wt% of a satd. aq. soln. of NaCl. The amt. of water to be added is not limited, yet it is e.g. 5-300 wt% to the iron powder. An inert substance such as fiber powder or inorg. water absorbing substance may be added as a water holding material to improve the gas permeability. The resulting compsn. is charged into a wholly or partially permeable container. This compsn. heats when contacted to oxygen or air, and by interrupting the contact it stops heating. A heating state of 40-70 deg.C can be continued for 18-30 hr according to the amt. of iron powder, so this compsn. can be used as a substitute for a pocket heater.</p> |
