Defoamer formulations containing organopolysiloxanes containing per molecule at least one structural unit of general formula O 1/2 R 2 Si-Y-SiRO 2/2 and at least 2 units of general formula R 1 R 2 SiO 1/2 and units of general formula R 2 SiO 2/2, wherein R may be identical or different and represents a monovalent SiC-bonded hydrocarbon radical having 1 to 30 carbon atoms which may contain one or more nonadjacent O-atoms and which is free from aliphatic carbon-carbon multiple bonds and R 1 is R or an alkenyl radical having 2 to 30 carbon atoms, preferably a methyl radical or a vinyl radical, wherein at least one alkenyl radical per molecule is present, Y represents a divalent hydrocarbon radical having 2 to 30 carbon atoms, with the proviso that the organopolysiloxane contains a structural element of formula R 2 Y 2 SiO-(SiR 2 O) x1 -SiRY 1 O-(SiR 2 O) x2 -SiR 2 R 1, wherein R and R 1 are as defined above, Y 1 represents a divalent hydrocarbon radical having 2 to 30 carbon atoms which is bonded to a group having the formula SiR 2 O 1/2, Y 2 represents a divalent hydrocarbon radical having 2 to 30 carbon atoms which is bonded to a group having the formula SiRO 2/2, and x 1 and x 2 are 0 or an integer, with the proviso that the sum of x 1 +x 2 is x, wherein x is on average more than 5, preferably more than 10, and less than 100, by preference less than 80, preferably less than 60, fillers and organopolysiloxane resins composed of units of general formula R 2 e (R 3 O) f SiO (4-e-f)/2, wherein R 2 may be identical or different and represents a hydrogen atom or a monovalent, optionally substituted, SiC-bonded hydrocarbon radical having 1 to 30 carbon atoms, R 3 may be identical or different and represents a hydrogen atom or a monovalent, optionally substituted hydrocarbon radical having 1 to 4 carbon atoms, e is 0, 1, 2 or 3 and f is 0, 1, 2, or 3, with the proviso that the sum of e+f is not more than 3 and that the sum of e+f is 2 in less than 50% of all units of formula in the organopolysiloxane resin. organopolysiloxanes containing per molecule at least one structural unit of general formula O 1/2 R 2 Si-Y-SiRO 2/2 and at least 2 units of general formula R 1 R 2 SiO 1/2 and units of general formula R 2 SiO 2/2, wherein R may be identical or different and represents a monovalent SiC-bonded hydrocarbon radical having 1 to 30 carbon atoms which may contain one or more nonadjacent O-atoms and which is free from aliphatic carbon-carbon multiple bonds and R 1 is R or an alkenyl radical having 2 to 30 carbon atoms, preferably a methyl radical or a vinyl radical, wherein at least one alkenyl radical per molecule is present, Y represents a divalent hydrocarbon radical having 2 to 30 carbon atoms, with the proviso that the organopolysiloxane contains a structural element of formula R 2 Y 2 SiO-(SiR 2 O) x1 -SiRY 1 O-(SiR 2 O) x2 -SiR 2 R 1, wherein R and R 1 are as defined above, Y 1 represents a divalent hydrocarbon radical having 2 to 30 carbon atoms which is bonded to a group having the formula SiR 2 O 1/2, Y 2 represents a divalent hydrocarbon radical having 2 to 30 carbon atoms which is bonded to a group having the formula SiRO 2/2, and x 1 and x 2 are 0 or an integer, with the proviso that the sum of x 1 +x 2 is x, wherein x is on average more than 5, preferably more than 10, and less than 100, by preference less than 80, preferably less than 60, R may be identical or different and represents a monovalent SiC-bonded hydrocarbon radical having 1 to 30 carbon atoms which may contain one or more nonadjacent O-atoms and which is free from aliphatic carbon-carbon multiple bonds and R 1 is R or an alkenyl radical having 2 to 30 carbon atoms, preferably a methyl radical or a vinyl radical, wherein at least one alkenyl radical per molecule is present, Y represents a divalent hydrocarbon radical having 2 to 30 carbon atoms, R and R 1 are as defined above, Y 1 represents a divalent hydrocarbon radical having 2 to 30 carbon atoms which is bonded to a group having the formula SiR 2 O 1/2, Y 2 represents a divalent hydrocarbon radical having 2 to 30 carbon atoms which is bonded to a group having the formula SiRO 2/2, and x 1 and x 2 are 0 or an integer, with the proviso that the sum of x 1 +x 2 is x, wherein x is on average more than 5, preferably more than 10, and less than 100, by preference less than 80, preferably less than 60, fillers and organopolysiloxane resins composed of units of general formula R 2 e (R 3 O) f SiO (4-e-f)/2, wherein R 2 may be identical or different and represents a hydrogen atom or a monovalent, optionally substituted, SiC-bonded hydrocarbon radical having 1 to 30 carbon atoms, R 3 may be identical or different and represents a hydrogen atom or a monovalent, optionally substituted hydrocarbon radical having 1 to 4 carbon atoms, e is 0, 1, 2 or 3 and f is 0, 1, 2, or 3, with the proviso that the sum of e+f is not more than 3 and that the sum of e+f is 2 in less than 50% of all units of formula in the organopolysiloxane resin. R 2 may be identical or different and represents a hydrogen atom or a monovalent, optionally substituted, SiC-bonded hydrocarbon radical having 1 to 30 carbon atoms, R 3 may be identical or different and represents a hydrogen atom or a monovalent, optionally substituted hydrocarbon radical having 1 to 4 carbon atoms, e is 0, 1, 2 or 3 and f is 0, 1, 2, or 3,