Abstract: To a fluorosilicone rubber composition comprising an organopolysiloxane having trifluoropropyl groups, a microparticulate silica filler, and a curing agent, there is added a specific amount of a linear organopolysiloxane oil having trifluoropropylmethylsiloxy groups in its backbone and having no crosslinked points in its molecule. The composition cures into fluorosilicone rubber experiencing minimized swell upon immersion in fuel oil and having satisfactory mechanical strength.

Abstract: Organopolysiloxane compositions prepared from an organopolysiloxane and a crosslinking agent comprising bis-4-methylbenzoyl peroxide (PMBP) and at least one compound from the group consisting of benzoyl peroxide, dicumyl peroxide, 2,5-dimethyl-hexane-2,5-di-tert-butyl peroxide (DHBP) and di-tert-butyl peroxide exhibit less tendency to yellow upon vulcanization, and can produce tear resistant, substantially odor free vulcanizates.

Abstract: This invention relates to a new adhesive coating composition, particularly for use on airbag fabrics, which is composed of a crosslinked blend of a polyalkyl- or polyphenylsiloxane with vinyl functionality and a copolymer of ethylene and methyl acrylate. This coating provides excellent adhesive properties to the coated fabric, in that it restricts the movement, when put under stress, of the yarns constricting that fabric, which are situated adjacent to seams in the fabric. This reduces the effect known in the trade as combing. Fabric treated with this material in the mainer described herein, requires a marked increase in the amount of force required for this yarn movement. This distortion of the fabric can be detrimental in an automotive airbag, in that, it may result in the loss of inflating air, and under extreme conditions may result in a seam failure.

Abstract: A silicone rubber composition comprising an organopolysiloxane containing at least two alkenyl radicals and having a degree of polymerization of at least 100, an organopolysiloxane or organosilane, reinforcing silica, and an alkali metal salt of phosphoric acid has minimized plasticity recovery with time and improved storage stability and cures with an organic peroxide or addition reaction curing agent into a silicone rubber having improved compression set and yellowing resistance.

Abstract: Oligomers of the formula: [R3SiO½]m[O½Si(R2)O½]n[SiO{fraction (3/2)}R]o[SiO{fraction (4/2)}]p  (I) wherein each R is selected individually from the group consisting of B, R1,—OR2, R3 and R4; B is an organosilyl functional group bridged to the Si atom of the siloxane oligomer backbone by an Si—C bond; each R1 is independently a saturated or aromatic hydrocarbon group of 1 to 16 carbon atoms; each R2 is independently a group as defined for R1 or an acyl group; and each R3 is independently a monovalent organic radical containing an aliphatically unsaturated hydrocarbon group and each R4 is a monovalent organic radical linked to the Si atom of the siloxane oligomer backbone by an Si—C bond, which does not include an aliphatically unsaturated hydrocarbon group and which has thereon one or more members of the group selected from ether, polyether, ester, polyester, carbamate, polyurethane, isocyanurate, thioether, polysulfide

Abstract: The invention relates to aliphatically unsaturated organosilicon compounds having 2 to 17 silicon atoms, to processes for their preparation and to their use in crosslinkable organopolysiloxane compositions, especially in compositions which can be crosslinked peroxidically or by hydrosilylation.

Abstract: An organopolysiloxane, a hydrolyzable group-bearing methylpolysiloxane, a thermal conductive filler, and a curing agent are blended to form a silicone rubber composition which is minimized in viscosity or plasticity increase and remains effectively moldable and workable even when loaded with a large amount of the thermal conductive filler. It cures into a silicone rubber part having a high thermal conductivity.

Abstract: A silicone rubber composition, comprising: (A) an polyorganosiloxane gum represented by the following average structural formula: RaSiO(4−a)/2 (where R is a substituted or non-substituted monovalent hydrocarbon, and a is a number between 1.8 and 2.3); (B) microparticulate silica; and (C) a methyl-substituted benzoyl peroxide having the maximum grain diameter not exceeding 50 &mgr;m and an average grain diameter of 30 &mgr;m. When cured, the silicone rubber composition has reduced nonuniformity in the physical properties because of fewer voids, resulting in decreased frequency of spark-outs in the insulated wires.

Abstract: A silicone rubber base compound for electrical wire coating such that when it is extruded using an extruding machine having a variable screw with an L/D=10 and a die with a diameter of 1 mm attached thereto at a barrel and head temperature of 70° C., the per-minute extruder output rate at a screw rotation speed of 100 rpm is not less than 1.2 times the extruder output rate at a screw rotation speed of 50 rpm, a silicone rubber composition for electrical wire coating obtained by compounding diacyl organic peroxide consisting of carbon atoms, hydrogen atoms, and oxygen atoms with the silicone rubber base compound for electrical wire coating, and a process for the production of silicone rubber coated electrical wire using the silicone rubber composition for electrical wire coating.

Abstract: Poly(siloxane-acrylate) elastomers with low weep characteristics are formed by the steps of: (A) forming an amine functional alkenyl-containing siloxane by mixing and heating: (a) a polydiorganosiloxane, (b) an amino-functional silane hydrolyzate, (c) an alkenylorganosiloxane, and (d) a base equilibration catalyst, then (B) reacting, at room temperature, the amine functional alkenyl-containing siloxane with an acrylate to form a curable alkenyl-containing poly(siloxane-acrylate) with oxycarbonylethyleneimino-containing organic groups, and (C) curing the alkenyl-containing poly(siloxane-acrylate) to form an poly(siloxane-acrylate) elastomer.

Abstract: A silicone elastomer composition which has hardness of 80 durometer Shore A, low structuring and low specific gravity.

Abstract: A curable silicone wire and cable coating composition with improved flame resistance at heat flux rates of 50 to 90 kW/m2, made by mixing ingredients comprises: (A) 30 to 90 weight percent of a heat-curable non-halogenated organosiloxane polymer, containing at least 2 alkenyl groups per molecule, (B) 1 to 65 weight percent of a reinforcing silica filler, based on the total composition, (C) 5 to 70 weight percent wollastonite having an average particle size of 2 to 30 &mgr;m, based on the total composition, and (D) curing component sufficient to cure the composition.

Abstract: An oligomer of the formula: [R3SiO1/2]m[O1/2Si(R2)O1/2]n[SiO3/2R]o[SiO4/2]p  (I) wherein each R is selected individually from the group consisting of R1, —OR2 and —OR3; each R1 is independently a substituted or unsubstituted hydrocarbon group; each R2 is a C1-C6 alkyl group or an acyl group; and each R3 is a independently an alkyl or alkenyl group having at least 8 carbon atoms; with the provisos that if R3 is alkenyl, there is no unsaturation within two carbon atoms adjacent to the oxygen atom of the —OR3 group; at least one R group is —OR3; at least one quarter of all R groups are —OR2 or —OR3; m=2 to 20; n=0 to 50; o=0 to 20; and p=0 to 10. The oligomer is a useful component of in insulation formulations for wire and cable used in underground locations.

Abstract: Water-soluble, i.e. easily dispersible, amino-functional polyorganosiloxanes obtained by radical polymerization of vinyl compounds containing amino or ammonium groups onto polyorganosiloxanes which contain at least one mercapto group. They are suitable as textile finishing aids, surfactants and emulsifiers.

Abstract: Peroxidically crosslinkable silicone rubber compositions containing a filler which has covalently bound Si—H-containing groups exhibit lower tendency toward yellowing while maintaining or increasing other elastomer physical properties and processing properties.

Abstract: A Heat-curable silicone rubber composition comprising (A) 100 weight parts organopolysiloxane with the average unit formula RXSiO(4−x)/2 each R is independently selected from the group consisting of hydroxyl and substituted and unsubstituted monovalent hydrocarbon groups and x has a value from 1.9 to 2.1 and containing at least 2 silicon-bonded alkenyl groups in each molecule, (B) 10 to 100 weight parts reinforcing filler, (C) 0.1 to 10 weight parts carboxiloxane dendrimer that contains at least 3 silicon-bonded hydrogen atoms in each molecule, and (D) 0.1 to 10 weight parts organoperoxide.

Abstract: A crosslinkable silicon polymer composition is provided comprising (A) a silicon polymer containing Si--Si bonds and Si--H groups and having a Mn of 500-500,000, (B) a polyfunctional aromatic carboxylic acid allyl ester, and (C) an organic peroxide or azo compound. The composition cures into a crosslinked polysilane film which is solvent insoluble, tough, and abrasion resistant.

Abstract: A coating composition comprising a mixture of a methyl-rich silicone resin (S-1) and an acrylic resin (A-1) obtained by polymerizing at least one radical polymerizable vinyl monomer (M-1), or a reaction product obtained by reacting the silicone resin (S-1) with the radical polymerizable vinyl monomer (M-1) is suitable for coating carrier particles to form an electrophotographic carrier.

Abstract: A silphenylene polymer having the general formula: ##STR1## wherein each R is independently a monovalent hydrocarbon group free of aliphatic unsaturation and having 1 to 10 carbon atoms; Ph is a substituted or unsubstituted phenylene group; R.sup.1 is an alkylene group having 2 to 10 carbon atoms or an alkyleneoxyalkylene group; A is a hydrolyzable group or a hydroxy group; B is an alkylene group having 2 to 10 carbon atoms, an alkyleneoxyalkylene group, or an oxygen atom; n is an integer from 0 to 2; x is an integer having a value of at least 1; y is an integer having a value of at least 0; and z is an integer having a value of at least 0.

Abstract: A primer for promoting adhesion between an elastomeric adhesive and a nonporous substrate containing a silane-modified saturated polyester polymer and an adhesion promoter in an anhydrous solvent. The invention is also directed to a silane-modified saturated polyester polymer, and an adhesion promoter made by the reaction of a multifunctional isocyanate and an organosilane.

Abstract: Novel rubber-modified rigid silicone resins are disclosed. The novel resins are the copolymerized reaction product of (A) an organosilicon composition selected from the group consisting (I) an organosilicone resin, (II) hydrolyzable precursors of (I), and an hydrolyzate of (II), (B1) a first silicone rubber having a nonfunctional linear chain length between functional groups from 6 to 100 and (B2) a second silicone ruberr having terminal functional groups and a degree of polymerization from about 200 to 1,000. The novel rubber-modified rigid silicone resins of the invention show remarkably high fracture toughness, K.sub.Ic, and critical strain energy release rate G.sub.Ic.

Abstract: A curable composition comprises a siloxane polymer, filler and a curing agent which is capable of effecting the cure when heated, wherein the curing agent comprises bis(2,4-difluorobenzoyl) peroxide or bis(2,6-difluorobenzoyl) peroxide. The composition is curable to a elastomeric condition by heat.

Abstract: A preformed stabilizer composition based on a precursor stabilizer obtainable by reacting a silicon atom containing compound of formula R.sub.n SiX.sub.4-n or R.sub.n Si((--OSi(R.sup.1).sub.2).sub.p X).sub.4-n wherein the R groups are independently saturated or unsaturated hydrocarbyl groups, at least one R group being an olefinically unsaturated hydrocarbyl group; R.sup.1 is a hydrocarbyl group, X is a C.sub.1 to C.sub.10 alkoxy group, n is an integer from 1 to 3 and p is an integer greater than zero, with a polyether polyol having an average molecular weight in excess of 400 and a hydroxyl number in the range 20 to 280 is used to manufacture polymer polyol compositions having a combination of (a) high polymer content, from 30 weight percent to 60 weight percent, (b) lower viscosities, typically less than 9,000 centipose, (c) product stability such that 100% passes through a 150 mesh screen, and (d) up to 100% of the polymer solids content passes through a 700 mesh screen.

Abstract: The invention provides a primer composition comprising (I) an organoalkoxysilane or siloxane, (II) an organohydrogensiloxane having an SiH group and an alkoxysilyl group, and (III) an organic titanate. Also provided is a primer composition comprising (A) an alkenyl-containing organopolysiloxane, (B) an organopolysiloxane, (C) an organoalkoxysilane or siloxane, (D) an organohydrogensiloxane having an SiH group and an alkoxysilyl group, (E) a platinum catalyst, (F) an organic titanate, and (G) an organic peroxide. The primer compositions have sufficient adhesion to join thermoset silicone rubber to various substrates.

Abstract: The invention relates to aliphatically unsaturated organosilicon compounds having 2 to 17 silicon atoms, to processes for their preparation and to their use in crosslinkable organopolysiloxane compositions, especially in compositions which can be crosslinked peroxidically or by hydrosilylation.

Abstract: A method for synthesizing an apophyllite-derived 3-cyanopropyldimethylsiloxy-5-hexenyldimethylsiloxy sheet polymer (A-CM.sub.2 -HEM.sub.2); an apophyllite-derived 3-cyanopropyldimethylsiloxy-vinyldimethylsiloxy sheet polymer (A-CM.sub.2 -VM.sub.2); and an apophyllite-derived 3-cyanopropyldimethylsiloxy-n-decyldimethylsiloxy sheet polymer (A-CM.sub.2 -DM.sub.2). These polymers form gels with simple polar solvents such as acetone and therefore can be easily processed. The first two of the polymers, i.e., A-CM.sub.2 -HEM.sub.2 and A-CM.sub.2 -VM.sub.2, form gels with polar solvents carrying olefinic linkages, and these gels can be crosslinked into sheet composites having fully exfoliated organosilicon sheets in an organic matrix.

Abstract: A silicone rubber composition that does not foam or evolve an unpleasant odor during its cure and that cures into low-surface-tack, non-yellowing silicone rubber moldings comprises:(A) polydiorganosiloxane gum with the average component formula R.sub.a SiO.sub.(4-a)/2 where R represents substituted and unsubstituted monovalent hydrocarbon groups and a is from 1.9 to 2.1,(B) microparticulate silica,(C) bis(ortho-methylbenzoyl)peroxide, and(D) bis(para-methylbenzoyl)peroxide,wherein the component (C) to component (D) weight ratio is from 1:9 to 8:2.

Abstract: Disclosed is an anaerobic hardening composition comprising (A) 100 parts by weight of a (meth)acryloyloxy group-containing polyorganosiloxane, (B) from 0.01 to 20 parts by weight of a dialkyl peroxide and (C) from 0.1 to 20 parts by weight of an amine. The composition hardens in the absence of oxygen with excellent hardenability and adhesiveness-revealing speed to give a hardened product having a high adhesion power.

Abstract: The invention relates to a substance mixture for a material for a cofferdam, to the material, and to the use and preparation thereof.

Abstract: The invention relates to compositions which crosslink to give elastomers and are based on component (A) comprising polyorganosiloxane (I) with at least two alkenyl groups per molecule and component (B) comprising polyorganosiloxane (II) with at least two silicon-bonded hydrogen atoms and organic per oxide (III).

Abstract: A silicone rubber electrical wire insulating covering formed by curing a composition comprising (A) 100 parts by weight of a polydiorganosiloxane gum, (B) 10 to 150 parts by weight of finely powdered silica, (C) 0.01 to 20 parts by weight of a zinc compound, and (D) 0.1 to 10 parts by weight of a methyl-group-substituted benzoyl peroxide. When cured the composition has good electrical insulating characteristics and does not adhere to electrical conductors.

Abstract: A silicone rubber composition that yields silicone rubber whose durometer can be freely reduced without a concomitant reduction in the mechanical properties of the silicone rubber. The reduction in durometer is achieved by controlling the concentration of an organosiloxane having hydrogen substitution on terminal silicon atoms.

Abstract: The invention relates to polyorganosiloxane rubber compositions which vulcanize to elastomers under the influence of heat and compriseA) 100 parts by weight of organopolysiloxane,B) 10 to 200 parts by weight of filler,C) 0.1 to 10 parts by weight of crosslinking agent which forms free radicals andD) 0.05 to 10 parts by weight of aliphatic alcohol with C.sub.8 - to C.sub.30 -alkyl radicals.The aliphatic alcohol (D) acts as an internal mold release agent.

Abstract: The present invention relates to pressure sensitive adhesive compositions which are prepared by heating a mixture of a polydiorganosiloxane, a silicone resin copolymer, and an organic amine compound or metal salt thereof, and then adding an organic peroxide or azo compound to the resultant reaction product. The silicone pressure sensitive adhesives of this invention are useful in preparing articles such as pressure sensitive tapes, labels, emblems and other decorative or informational signs.

Abstract: A curable silicone rubber composition comprising (A) organopolysiloxane comprising at least 2 silicon atom-bonded alkenyl groups in each molecule described by formula R.sub.a SiO.sub.(4-a)/2, where R represents a substituted or unsubstituted monovalent hydrocarbon group and a is a number from 1.95 to 2.05; (B) fine powdery silica; (C) a reaction mixture of (a) a platinum compound and (b) a compound containing an alkynyl group and an alcoholic hydroxy group in each molecule; and (D) a curing agent. The present invention is also a manufacturing method of curable silicone rubber composition. The curable silicone rubber compositions have an excellent flame-retarding property and good tracking resistance and other electrical properties.

Abstract: The present invention provides novel vinyl containing organopolysiloxane elastomers which possess excellent low compression set and heat aging characteristics and which can advantageously be formulated into liquid silicone elastomer moldable compositions.

Abstract: The present invention is silicone rubber compositions the exhibit high mechanical strength and excellent electrical properties such as tracking resistance, arc resistance, and erosion resistance. The improved properties are obtained by incorporation in the compositions aluminum hydroxide powder which has been treated with a treating agent selected from the group consisting of silanes and siloxanes having alkenyl and alkoxy or hydroxy substitution.

Abstract: This invention relates to pressure sensitive adhesive compositions which are obtained by a method comprising reacting a mixture comprising at least one polydiorganosiloxane, at least one silicone resin copolymer, at least one solvent or plasticizer selected from the group consisting of carboxylic acids having at least six carbon atoms and having a boiling point of at least 200.degree.C. and amines having at least 9 carbon atoms and having a boiling point of at least 200.degree.C. to form a reaction product, and then adding an organic peroxide or azo compound to the resultant reaction product. The silicone pressure sensitive adhesives of this invention are useful in preparing articles such as pressure sensitive tapes, labels, emblems and other decorative or informational signs.

Abstract: A curable composition which contains a siloxane polymer, filler and a curing agent which is capable of effecting the cure when heated, wherein the curing agent comprises a 1,1 di(tertiary butylperoxy) 3,3,5-trimethylcyclohexane in combination with peroxide selected from the group consisting of dicumyl peroxide and 2,5-di(tertiary butylperoxy) hexane. Also disclosed is a method of providing a molding using said curable composition.

Abstract: Novel functionalized peroxides which may be used as crosslinking, grafting and curing agents, initiators for polymerization reactions and as monomers for condensation polymerizations to form peroxy-containing polymers, which in turn can be used to prepare block and graft copolymers, have the following Formula I: ##STR1## R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5, R.sup.6, R.sup.7, X, Y.sup.1, Y.sup.2, Y.sup.3, Z.sup.1, Z.sup.2, x, y and z are as defined in the Summary of the Invention. The compounds of Formula I may be prepared by reacting hydroxy-containing tertiary hydroperoxides with diacid halides, phosgene, dichloroformates, diisocyanates, anhydrides and lactones to form the functionalized peroxides. These reaction products may be further reacted, if desired, with dialcohols, diamines, aminoalcohols, epoxides, epoxy alcohols, epoxy amines, diacid halides, dichloroformates and diisocyanates to form additional functionalized peroxides.

Abstract: A method of crosslinking a silazane polymer having Si--H bonds in which the polymer is mixed with a crosslinker selected from alkenyl functional cyclosiloxanes and alkenyl functional cyclosilazanes and a crosslinking promoter and then heated to a temperature sufficient to crosslink the silazane polymer. The mixture of the silazane polymer, crosslinker and promoter is useful in the formation of ceramic matrix composites.

Abstract: New organopolysiloxane masses cross-linkable into elastomers by radical formation containing (1) high-viscosity diorganopolysiloxanes with a value equal to at least 3000 Nm, (2) low-viscosity vinyl-containing organopolysiloxanes having 20 to 1.10.sup.6 mPa.multidot.s at 25.degree. C. consisting of siloxane units (M units) having the formulae R.sup.1 R.sub.2 SiO.sub.1/2 and/or R.sub.3 SiO.sub.1/2, of siloxane units (D units) having the formulae R.sup.1 RSiO and/or R.sub.2 SiO and optionally HRSiO, and of siloxane units (T or Q units) having the formulas RSiO.sub.3/2 and/or R.sub.1 SiO.sub.3/2 and/or SiO.sub.2, in which R stands for a monovalent, possibly substituted hydrocarbon residue with 1 to 18 hydrocarbon atoms and R.sub.1 stands for a vinyl residue, provided that the organopolysiloxanes contain at least 1.0% by weight Si-bound vinyl groups; as well as (3) fillers.

Abstract: This invention pertains to an addition-curable silicone adhesive composition that is extrudable and flowable at room temperature in the absence of a solvent comprising (A) 40 to 95 parts of an alkenyl functional siloxane resin consisting essentially of R.sub.3 SiO.sub.1/2 siloxane units and SiO.sub.4/2 siloxane units, wherein R is a monovalent hydrocarbon radical having 1 to 6 carbon atoms; there being from 0.5 to 1.5 R.sub.3 SiO.sub.1/2 units for every SiO.sub.4/2 units; said resin containing 0.01 to 22 wt % alkenyl functionality; (B) 0.5 to 10 parts of an SiH containing polyorganosiloxane having an average of at least 2 silicon-bonded hydrogen atoms per molecule and having a viscosity of 0.8 to 2,000 mm.sup.2 /s; (C) a hydrosilylation catalyst in sufficient quantity to promote curing of said composition; (D) optionally, up to 70 parts of a polydiorganosiloxane having at least two ethylenically or acetylenically unsaturated groups per molecule and having a viscosity of 100 to 80,000 mm.sup.

Abstract: The invention relates to self-curing systems based on polymerizable and hydrolytically condensable or condensed silicon compounds. The systems according to the invention comprise one or more components which contain starter and/or activator systems, at least one component of the system containing a silicon compound of the formula I or Ia, or a precondensed form thereof,{X.sub.a R.sub.b Si?R'(A).sub.c !.sub.(4-a-b) }.sub.x B (I){X.sub.a R.sub.b Si?(R'A).sub.c !.sub.(4-a-b) }.sub.x B (Ia)The invention furthermore relates to activators in the form of silane-bonded tertiary amines of the general formula IX or X.

Abstract: A coating composition having excellent antifogging property, good abrasion resistance, improved adhesion to the substrate and good water resistance, which comprises an epoxy functional organosilane or the hydrolysate or condensate thereof; an amino functional organosilane or the hydrolysate or condensate thereof; a hydrophilic (meth)acrylate monomer, or a copolymer of two components selected from the hydrophilic (meth)acrylate monomer, another hydrophilic monomer and an organosilane and/or a terpolymer of the three components; a curing catalyst; and, optionally, a multi-functional (meth)acrylate monomer having at least two (meth)acryl groups and a radical polymerization initiator.

Abstract: A method of crosslinking a silazane polymer having Si--H bonds in which the polymer is mixed with a crosslinker selected from alkenyl functional cyclosiloxanes and alkenyl functional cyclosilazanes and a crosslinking promoter and then heated to a temperature sufficient to crosslink the silazane polymer. The mixture of the silazane polymer, crosslinker and promoter is useful in the formation of ceramic matrix composites.

Abstract: A curable composition, having utility for threadlocking engageable members of a threaded mechanical fastener, comprising: a reactive silicone (meth)acrylate emulsified in an aqueous medium, optionally further comprising a polymerizable non-silicone (meth)acrylate monomer or oligomer; and a microencapsulated peroxy initiator which is initiatingly effective for cure of the reactive silicone (meth)acrylate.

Abstract: The present invention relates to an inhibitor package that allows for low temperature cure in thermal solventless paper release products while at the same time maintaining reasonable bulk and thin film bath lives.

Abstract: The present invention provides a sealing component for connector waterproofing having an excellent heat resistance, low-temperature resistance and oil resistance which can be economically produced in a reduced molding time. A novel sealing component for connector waterproofing is provided, which comprises a vulcanized composition comprising at least (a) 100 parts by weight of an organopolysiloxane represented by the following average composition formula (I), (b) from 5 to 500 parts by weight of a finely divided silica filler, (c) from 0.01 to 5 parts by weight of a dialkyl peroxide or peroxy ketal which has a half-life of 1 hour at a temperature of from 130.degree. C. to 150.degree. C., (d) from 0.1 to 5 parts by weight of a silicon compound having two or more Si--H bonds per molecule, and (e) from 0.01 to 2 parts by weight of an organic peroxide represented by the following general formula (II):R.sup.1.sub.m SiO.sub.(4-m)/2 (I)wherein R.sup.

Abstract: A thin fluorosilicone elastomer coating which prevents oil weepage problems with silicone rubber gaskets wherein the fluorosilicone elastomer coating contains a vinyl-containing fluorosilicone polymer cured with a hydrogen-containing siloxane/platinum group hydrosilation catalyst curing system used in combination with a peroxide curing agent.