What Is A Tempur-pedic Pillow Made Up Of To Cause It To Freeze Solid When Left In A Car For 2 Hours At 20 Degrees Fahrenheit?

Well my darlin'....that's like askin' us where Jimmy Hoffa is....lol
It's a trade secret, that only a few people who work at Temperpedic know. All I can tell you Nas...is that it's made from layers of a "visco-elastic", which is a very temperature sensitive material. When it gets warmer & more humid, it gets softer.... When it gets cooler, it gets harder.
( hmmmm, won't say it, won't say it, won't say it ) LOL
The old formula for Temperpedic material (which is a Nasa technology ),was made in the 70's to help astronauts fight off the smashing effects of g-force during take off and flight. That formula WAS released in 1991. ( somewhere???) I can't find it tho. They now have a new formula, which hasn't been released....& won't be, unless Temperpedic loses all their customers.....Or one of the few people who does know it, gets paid off even better by another company to let the secret out. I guess this isn't the type of pillow you want to have if you live in an Igloo !!

Foam? Jim123

It is made up of a mixture of a methanol derivative, acetone, and benzine mixed in a soluble water carrier. At that temperature, the larger % of water takes over and freezes.
P.S. It's not a trade secret - the patent expired years ago.

I have one . I don't know exactly what it is made of but it is heat activated . I have my bedroom pritty cols and when I come to bed it almost feels like a rock after a few moments it gets soft and contours to my head ( very comfortable ) . Sorry that I could not help with what it is made of they kind of keep it a secret .

Sorry sis, don't have a science nor a chemistry hat to even put on , so I have no clue but when time permits I will be checking, unless they have the secret locked in and when it is like that you have to be careful because it has gotten to market without the proper inspection, I have heard of them but never used one, was it OK after leaving it in the car ?...♥

I don't know honestly dear. I am in a bit of pain from a fall today, and am on a few pain meds, lol so, the interest in doing the proper searching is low to say the least. Lol Going to see the doc tomorrow probably. Left leg is swelling, where the two other clots were. Ugh, dreading this! Sorry I can't help more dear.

It's a trade secret, but it's a temperature-sensitive foam based on NASA technology from the '70s in acceleration couches. It becomes soft at body temperature, and firm at cooler temperatures, so I guess if left outside in freezing temperatures, while it wouldn't freeze as such, it would certainly go very hard.

Hydrogen or water, that is my guesses, lOl...*p

If I had to guess I would say moisture collected in the pillow from daily use  from going from hot to cold temperatures made your tempur pedic pillow go frigid/stiff. : )