Use the links on this page to help you find out:
- What is a chemical hand warmer?
- What chemicals do they include?
- How do chemical hand warmers work?
- What is the maximum temperature they reach?
- Is the hand warmer only for one use? or can it be re-used?
http://www.grabberwarmers.com/faq.htm Especially the 'How do warmers work?'
http://www.moorbright.com/warmer_adhesive.asp Look at the Q&A at the foot of the page
http://www.shotgunreport.com/Reviews/HotHands/HotHands.html A hand-warmer being tested
http://www.bowhuntinginfo.com/Equipment/UniqueEquipmentArchieve/PineStarWarmers.htm for a pack that is re-usable!
http://www.tki.org.nz/r/science/scienceschool/resources/1999/CldHotPk.htm Cold and Hot Packs from the New Zealand school curriculum
Search for more links on www.google.co.uk using the terms "chemical hand warmers" and "maximum temperature"