Room temperature-curable organopolysiloxane composition

A room temperature-curable organopolsiloxane composition which comprises:

• (A) a combination of
• (A-1) 100 parts by weight of a diorganopolysiloxane of which each of the silicon atoms at the molecular chain ends has a silanolic hydroxy group or two alkoxy groups directly bonded thereto,
• (A-2) from 1 to 400 parts by weight of a filler,
• (A-3) from 0.1 to 5 parts by weight of an alkenyloxy silane compound represented by the general formula
• R.sup.1.sub.n Si.sup.X.sub.4-n,
• in which R.sup.1 is a substituted or unsubstituted monovalent hydrocarbon group selected from the class consisting of methyl, ethyl, propyl, vinyl, phenyl and 3,3,3-trifluoropropyl groups, X is an alkenyloxy group represented by the general formula
• --O--C(CH.sub.2 R.sup.3)=CHR.sup.2
• R.sup.2 and R.sup.3 each being a hydrogen atom or an alkyl group selected from the class consisting of methyl, ethyl and propyl groups, and the subscript n is zero or 1, or a partial hydrolyzate thereof,
• (A-4) from 0.01 to 10 parts by weight of an organosilane or organopolysiloxane compound having, in a molecule, at least one substituted or unsubstituted guanidino group represented by the general formula
• --N.dbd.C(NR.sup.4.sub.2).sub.2,
• in which R.sup.4 is a hydrogen atom or a monovalent hydrocarbon group, and
• (A-5) an alcohol compound represented by the general formula
• R.sup.5 OH,
• in which R.sup.5 is a monovalent hydrocarbon group, in an amount from equimolar to 20 times by moles of the groups denoted by X in the component (A-3);
• (B) an organosilane or organopolysiloxane compound having, in a molecule, at least one hydrogen atom di-rectly bonded to the silicon atom in an amount from 0.3 to 1.0 mole per mole of the alcohol compound as the component (A-5);
• and
• (C) an organic tin compound in an amount in the range from 0.01 to 10% by weight based on the overall amount of the components (A-1) to (A-5).