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Exothermic pads...

Externet
in Applied Chemistry

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I knew of heating pads that released heat when moistened and had to be regenerated by heating them for a certain time in an oven in order to be re-used endlessly.

Today I bought one * that does not instruct to 'regenerate' but seems to work the same every time it is re-wetted.

 

Is there two kinds, or am missing something ?

 

* Cliking the picture allows ~reading the instructions----> http://www.armysurpluswarehouse.com/survival-disaster/reusable-chemical-heating-pad.html

 

By the way, what is the chemical, if known ?

 

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