invention are present in a proportion of more than about 35 preferably more than about 50 particularly preferably more than about 90 of the silicone containing substances of the total cold cure foam stabilizer as has long been known to persons familiar with this technical field short chain siloxanes or siloxane rings are always formed in small amounts by equilibration during the preparation of these siloxane chains due to thermodynamics here they are not taken into account separately the stabilizers used according to the invention can be obtained by combining siloxanes having chain lengths of more than 20 preferably more than 35 with one or more polyethers where at least one polytther preferably all polyethers used has or have a molecular weight of more than 1200 preferably more than 2000 the polyethers can comprise ethylene oxide propylene oxide and up to about 20 of butylene oxide or higher alkylene oxides and can have both hydroxyl groups and or c 1 c 6 alkyl ether or ester groups as end groups the compounds are prepared as described in the literature for silicone polyether copolymers e g by hydrosilylation of a polyether containing double bonds if desired in admixture with other polyethers containing double bonds see for example u s pat no 5 357 018 or u s pat no 5 306 737 combinations of various groups r 2 in the same polysiloxane are particularly preferred when used for producing hr polyurethane foams in molds these compounds according to the invention have the ability to stabilize the molded foams sufficiently and to regulate the cell structure even close to the surface the foam cushions obtained can be crushed comparatively easily to test the substances.