a multi - layered material construction with an inner material layer 2 and two outer layers 3 and 4 each arranged on a respective side of the inner material layer 2 is denoted by 1 in fig1 . the inner material layer 2 is made of a foamed polypropylene . it is in that case conceivable to use bio - polypropylene and also blends , copolymers or the like , which , however , usually contain polypropylene or bio - polypropylene at least to a major extent . also conceivable is the use of other foamable plastics materials . the density of the foamed material is in that case between 0 . 50 and 0 . 90 , particularly between 0 . 65 and 0 . 90 , g / cm 3 . the foaming can be carried out in a physical or chemical way . in the case of physical foaming , use of nitrogen , carbon dioxide , water steam or other standard gases is possible . very satisfactory foaming is achieved in environmentally friendly manner by this . the addition of fillers , particularly for improving foaming , is conceivable . at least one of the two outer layers 3 and 4 is provided with a filler . this filler can contain mineral fillers and also regrinds or the like . conceivable as mineral fillers are caco 3 , talcum or the like . the density of the filled layers 3 and 4 can in that case be up to 1 . 35 g / cm 3 . in this connection it is conceivable for each of the two outer layers 3 and 4 to be provided with filler . the foamed layer 2 and the two outer layers 3 and 4 so co - operate that a material breakable at room temperature results , as is known from , for example , multipack packagings of polystyrol , in which individual packagings can be separated by breaking away . the breakability is defined by the interaction of the filled layers 3 and 4 and the foamed layer 2 . according to a further embodiment of the invention it is also conceivable to provide a respective skin layer 5 and 6 on the outer side of the outer layers 3 and 4 . this can be useful particularly on the inner side of the finished packaging so as to prevent undesired effects of the filled layer on the content . it is also conceivable that , by virtue of this skin layer , barrier properties are also added or smooth surfaces produced . the thickness of a skin layer 5 or 6 is usually two to ten percent , preferably two to five percent of the total thickness of the material . surfaces which are especially smooth can be very satisfactorily printed , so that a uniform and high - quality printed image can be applied . in order to facilitate breaking and / or control the fracture the surface of the material 1 can be lightly punched or scored . in that case , the punching or scoring can have a maximum depth of between 0 . 03 and 0 . 1 millimetres . forming of such small punching or scoring depths has proved sufficient . the fracture is nevertheless significantly facilitated and reliably controlled . according to a further embodiment of the invention , which is illustrated in fig3 , it is possible to provide , for example between the inner layer 2 and the two outer layers 3 and 4 , tie , barrier or other functional layers , here denoted by the numerals 7 and 8 . the entire material usually has a thickness of between 0 . 6 and 1 . 5 millimetres . the density is between 0 . 6 and 1 . 2 g / cm 3 , preferably between 0 . 95 and 1 . 05 g / cm 3 . the material can , for further processing , be provided as a film web or as a web section , i . e . as a sheet . in order to form an item of packaging from the material , the material is deep - drawn . in that case , the deep - drawing parameters have to controlled and maintained within usual limits . the use of a deep - drawing device with a matched profile with undercuts of the deep - drawing punch , this also being known by the catchword ‘ innoform ’, is particularly advantageous , since the material thickness in the deep - drawing packaging is thereby kept substantially constant . the thus - produced packagings , particularly multipack packagings , can be provided on the outer side with printings , labels and also sleeves . the individual packagings of the multipack can be separated as required by simple breaking off from the multipack . the packaging material according to the invention is particularly suitable in all its variants for the form - fill - seal process . due to low storage cost and only small problems with hygiene this process is often used for foodstuff products , particularly yoghurt and the like . multipacks are also common there , these then being separated by the end user as required . it is additionally conceivable that the packaging material according to the invention can also be varied . further additional layers are conceivable . equally , it is conceivable that only one tie layer or intermediate layer 7 and 8 is provided . equally , it is conceivable that only one skin layer 5 and 6 is provided . the foamed layer 2 and a layer 3 or 4 provided with fillers can be regarded as a minimum requirement of the packaging material according to the invention .