Industry News

How Cool Fever Patches Work?


Cool Fever Patch is a polymer hydrogel with a mixture of the ingredients written below, which after is placed on the sheet and covered with a poly film on top and at the end placed in an outer bag and sealed properly.

  • Water
  • Glycerine
  • Polyacrylic acid
  • Aluminum hydroxide
  • Dimethyloldimethyl hydantoin


SHEET: White non-woven cloth.

POLY FILM: Polyethylene terephthalate laminate film.

OUTER BAG: Laminate film of vinylidene chloride coated polyethylene/polypropylene mixed with ethylene-vinyl acetate copolymer or a laminate film of polypropylene/alumina deposited polyester/polyethylene mixed with ethylene-vinyl acetate copolymer.


Cooling gel sheet contains a high percentage of water which works with the bodys natural cooling system helping to cool the body. As the temperature rises the heat of the skin causes the evaporation of water contained within the gel sheet which creates a cooling sensation on the surface of the skin. The heat of the skin causes the evaporation of water contained within the gel and as a result, lowers the temperature of the skin.


The evaporation process that produces cold sensation is totally harmless to human beings. The term endothermic process describes a process or reaction in which the system absorbs energy from its surroundings; usually, but not always in the form of heat. The intended sense is that of a reaction that depends on absorbing heat if it is to proceed.


Stable under normal conditions in case of the product sealed in outer package, when the strip covering the adhesive backing is removed and the gel is applied to the skin, an evaporation process occurs that lowers the surface temperature of the skin. The gel sheet is composed of a highly water-absorbing polymer that absorbs and releases heat. The heat from the skin is absorbed by the gel sheet and then is released into the air when the moisture evaporates.