Die Erfindung betrifft Penflufen enthaltende Mischungen, die Verwendung dieser Mischungen zum Schutz technischer Materialien und ein Verfahren zur Behandlung technischer Materialien mit den Penflufen Mischungen.Composition comprises penflufen and at least a compound (I) comprising phenol, boron compound, an ammonium compound (II), isothiazolinone, 3-iodo-2-propinyl-alkylcarbamate, 3-iodo-2-propinylcycloalkylcarbamate, 3-iodo-2-propinyl-arylcarbamate or an amino compound (III) or its acid-addition compound. Composition comprises penflufen and at least a compound (I) comprising phenol, boron compound, an ammonium compound of formula (((R 1>R 2>R 3>R 4>)N) nX) (II), isothiazolinone, 3-iodo-2-propinyl-alkylcarbamate, 3-iodo-2-propinylcycloalkylcarbamate, 3-iodo-2-propinyl-arylcarbamate or an amino compound of formula (NH 2-(CH 2) m-N(R 5>)-(CH 2) y-NH 2) (III) or its acid-addition compound. R 1>, R 2> : 1-6C-alkyl R 3>, R 4> : 6-22C-alkyl, 6-22C-alkenyl, 6-24C-aryl, 5-20C-cycloalkyl or -[CH 2-CH 2-O] z-CH 2-CH 2-OH (IV) z : 1-10 X : k-times charged anion n : whole number, preferably greater than 0 R 5> : 8-18C-alkyl, 8-18C-alkenyl or 5-20C-cycloalkyl and m, y : 1-6.