JohnA wrote:These guys want ten pounds sterling for the heat packs,
Thats for a pack of 7, so about $2.15 to warm 360ml of soup or water. (without adding shipping/Australia tax)
Which isnt that bad, $2 to have hot soup/dehydrated for dinner without carrying a stove.
Whats an extra $2 on an $8 dehy packet?
Especially useful in the snow, good luck using a jetboil inside a tent
bag of ground iron and magnesium!
I tried to work out what it is based on joules for 20g pack, but cant find good enough figgures on the energy in the materials.
Its something with 4900 joules per gram, based on their claim of 360g of water raised from approx 25c to 90c from a 20g pack plus water. (And my maths)
Some reviews claim its quicklime, but what I can find on quicklime (unreliable) would need 4 packets.
Couldnt find any MSDS on them.