heat storage medium based on glycol if the heat storage medium is based on glycol ethylene glycol monobutyl ether is filled into a homogenizer with a capacity of 1 l in combination with diethylene glycol and or triethylene glycol as dispersing liquid heat transfer fluid for example in the following amounts ______________________________________triethylene glycol 200 mlethylene glycol monobutyl ether ml 50zeolite with a particle size of lt 4 u03bcmand a pore size of approximately nm 4 wessalith np from degussa g 20silica e g aerosil from degussa 2 ggallium g______________________________________ 200 in order to obtain a homogeneous dispersion the speed of the grinding bade of the high speed homogenizer is set to approximately 18 000 rpm the dispersing time in the homogenizer is preferably 5 min this heat transfer concentrate is then added depending on the desired degree of enrichment in amounts of 2 4 or 8 g or more per liter to a chosen heat storage medium based on glycol such a heat storage medium can be for example glythermin p44 glythermin nf or glythermin 200 from basf by mixing of the heat transfer concentrate of the invention into a heat storage medium a heat transfer mixture of the invention is obtained that can be used for example in a latent heat storage device for further storage stabilization of the gallium particles in the ready to use low viscosity heat storage medium an anionic polymer for example rhodopol xanthan can be added in an amount of 0 5.