Abstract: The present invention pertains to a process for foaming mixtures of bifunctionally-ending di-organopolysiloxanes and acyloxsilane cross-linking agents, involving the addition to the mixture of sufficient quantities of an ammonium, amino, sodium or potassiumn hydrocarbonate.

Abstract: A kit for the production of rapidly-hardening aminosilane cross-linking silicone masses including:(A) 100 parts by weight of an at least bifunctionally terminated diorganopolysiloxane, which include a linear or branched chain of repeating units of the formula ##STR1## and which contains at least two end groups Z, wherein Z is --H, --OH, OR.sup.l or --SiR.sup.3 (NR.sup.4 R.sup.5).sub.2, and R.sup.l and R.sup.2 are independently a saturated or unsaturated hydrocarbon radical, optionally substituted with halogen or cyano groups,(B) 0.1 to 20 parts by weight of an aminosilane cross-linker of the general formulaR.sup.3.sub.y --Si--(NR.sup.4 R.sup.5).sub.4-ywherein y=0 or 1,R.sup.3 is hydrogen or a monovalent saturated or unsaturated hydrocarbon or hydrocarbonoxy radical, andR.sup.4 and R.sup.5 are independently selected from hydrogen and saturated or unsaturated aliphatic, cycloaliphatic, or aromatic hydrocarbon radical with 1 to 15 carbon atoms, optionally substituted with halogen or cyano groups,(C) 0.