common mineral zeolites are analcime chabazite heulandite natrolite phillipsite and stilbite an example mineral formula is na 2 al 2 si 3 o 10 16h 2 o the heat generation material most preferred using the above components includes a calcined calcium oxide this material is available as a small article size with a diameter less than about 0 2 mm and as a particle of somewhere between 0 2 and 0 8 mm larger particles are ground and smaller ones sieved and the calcium oxide is then calcined it has been found to be effective to calcine for at least 60 to 120 minutes and preferably about 90 minutes at temperatures above 500 u00b0 c and most preferably at about 550 u00b0 c for that period of time the calcined calcium oxide is of course desiccated to prevent any contamination by moisture laboratory grade citric acid and powdered zeolite are mixed with the calcium oxide in moisture free conditions in an appropriate reaction ratio to provide the exothermic reaction upon contact by the activating agent water the heat generating mixture 19 is spread throughout the inside of outer pouch 17 and covers parts of inner pouch 21 obviously separated from the activating agent 23 inside pouch 21 the vacuum is then pulled inside pouch 17 to assist in dispersing the activating agent this combination of pouches is placed with the desired quantity of personal hygiene wipes 15 inside package 11 and sealed for distribution and sale in a series of tests of the preferred embodiment as described above 100 of the activations by bending the packages resulted in warm personal hygiene wipes then a similar set of packages were prepared with the only change being no vacuum inside the outer pouch only 30 of the wipes.