Responses to your questions.

1. Do you use handwarmers? YES.

2. How often? I USE THEM WHEN HUNTING AND HAND DON'T DO ALOT OF MOVING. THRUS LESS CIRCULATION LEADING TO COLD HANDS AND OTHER EXTREMETIES. I ALSO GIVE THEM TO MY KIDS FOR ACTIVITIES LIKE SLEDDING, SNOWBOARDING AND ICE SKATING.

3. What do you like about them? SMALL. PLENTY OF HEAT PROVIDED. INEXPENSIVE.

4. What don’t you like about them? NOTHING REALLY.

5. What is one thing you would change? LOWER COST?

6. If you don’t use them, why not? I DO USE THEM. AS WELL AS THE OTHER WARMER PACKS.

7. How long do you need them to last for? THE WARMERS I USE GENERALLY MEET MY TIME REQUIREMENTS.




The most popular/common hand warmers that are currently out there, the ones that are air activated and last like 12 hours are probobly the best thing going out there.

I can't see or think of any material that would store heat in any manner and release it in any sort of a contolled manner that would allow it to act as a hand warmer for even a few hours.

Even 3 or 4 ounces of alloy heated to thousands of degrees F. would be to ambient temperature in probobly less than a half an hour and something like that simply wouldn't be feasible without burning the skin.

Again I believe the air activated warmers which create heat over an extended period of time thru chemical reaction are going to be tops and around for a long time.

And of course there are the old warmers that you actually fill with lighter fluid and once lit they allow the element to heat the steel case. I think I actually have a couple of those out in the shed.

Good luck with your project and even though I probobly offer nothing of help to you I wish you much luck. Don't give up. Many a great inventor or mind ran head on into many brick walls before sometimes realizing something remarkable. Heck look how rubber was invented - unintentionally and purely by accident.