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I know that iron filings are recycled in foundries, if not used for these patches or for other uses. I am referring to waste that is used by residual products from other manufacturing, which is obviously the case with iron filings and sawdust.
It is true that a well-wrapped hot water bottle can store a little more heat than 1 hour, but not by far the 12 hours of these patches, which are also much more practical in their application, since they can be worn for a day cool comfortably under clothing, or on a sore part of the body, as they are primarily intended, without getting in the way of a job or activity during the day.
For a hot water bottle, you first need to heat the water in the kitchen, which obviously implies an energy expenditure that we have to invest first and that is not necessary in these patches, which in themselves are a source of energy due to a chemical process. . Besides, they are still recyclable afterward, since the iron oxide, product of this chemical reaction, is still usable in foundries, since in any case iron oxide is the form in which this element appears in nature.
These patches are obviously a 100% ecological and recyclable product, containing neither before nor after toxic or polluting residues, not necessarily the same in a hot water bottle, in the manufacture of which various chemical and plastic products are used, which are difficult to recycle (PVC in the cap, several toxic products used in the rubber..)