depends upon the air or gas addition the consistency of the basic compound as well as the mixing period and the mixing speed which may vary similarly in this manner the final density of the finished products can be suitably adjusted values between 0 8 and 1 4 and preferably between 0 9 and 1 3 grams per cubic centimenter are desired through the admixing in of emulsifiers and or additional solvents the foam can be stabilized for a lengthy period during the manufacture these additional solvents will in addition thereto be further effective as supplementary or in an extreme case as execlusive pore formers and should be volatile between 20 u00b0 and 120 u00b0 c pursuant to the present process foamed erasers having extremely fine porous uniformly arranged foamed structure which are particularly light and inexpensive can be produced in a surprisingly simple manner through the combination of a commercial continuously operating foamer mixer and a particular gelling arrangement or procedure the foam mixer coupled with the gelling arrangement conveys the produced foam under pressure directly onto and respectively into a continuously operating conveying unit or extruder by means of the latter the foamed compound is conveyed through differentially constructed heating zones with for example temperature stages of 60 u00b0 90 u00b0 120 u00b0 130 u00b0 135 u00b0 c as a result the eraser compound gells under correctly.