The most remarkable feature of any phase change is that it occurs at a constant temperature, as energy is being added or removed. It appears to work like a cordless heating pad, providing comfortable heat up to three times longer than any other product on the market. This allows the hot and cold packs to adapt to the surface they are applied to and provides for a comfortable, soft application. Consequently they do not maintain a constant temperature and do not last as long. In cold therapy applications, gels and other products begin to warm upon skin contact.
Some gels are toxic and corrosive and can even present waste disposal problems.
In some cases, gels are made with glycol, the basic ingredient used in automobile antifreeze. Send mail to Webmaster with questions or comments about this web site.