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The
Science:
 Harnessing
the power of 'super cooled liquids', Instant
Heat Packs contain sodium acetate and
water. Sodium acetate is very good at
super cooling - it ‘freezes’
at 130º F (54º C), but will
exist as a liquid at a much lower temperature
and is extremely stable. Clicking the
small disc inside forces a few molecules
to change to the solid state, and the
rest of the liquid quickly follows until
the temperature of the solidifying liquid
reaches 130º F.
Using
the Heat Packs couldn’t be simpler:
the product has 2 forms, liquid (soft,
jelly-like & translucent) and crystallised
(firm & opaque). The liquid state
is the ‘Ready For Use’ state,
and can be activated anytime, anywhere.
Click or flex the little metal disc inside
the pouch, and you see crystals forming
and feel heat being generated immediately.
While the liquid is going through the
crystallisation process, it's helpful
to massage or knead the pack with your
fingers (which can actually be a therapy
in itself). The liquid becomes firm to
the touch and opaque rather than translucent.
The Heat Pack is now at 54º C, so,
although it's safe for everyone, including
children, the elderly and the infirm,
care must be taken, as with any hot object.
The
pack remains warm for some time, although
this will vary according to the ambient
temperature etc. When the pack has cooled
down, it can be ‘reset’, ready
to be used again, by being placed in a
pan of boiling water, and boiled for 5
-15 minutes (depending on the size of
heat pack) until all the crystals have
gone. Leave to cool and it's ready for
use again. It can be chilled in the fridge,
but must not be frozen.
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