The present invention relates to a glass yarn having a coating based on a polymer selected from vinyl acetate-vinyl chloride copolymers, polyvinyl chloride and polyvinylidene chloride, and which contains a silane of formula Si (R 1) (R 2) (R 3) (R 4) in which R 1, R 2, R 3, which may be identical or different, represent a C 1 -C 6 alkyl group, a C 2 -C 6 alkenyl group or a C 2 -C 6 alkynyl group, a C 6 -C 10 aryl group, a hydroxyl group, a C 1 -C 6 alkoxy group, a C 6 -C 10 aryloxy group, a C 1 -C 6 acyloxy group, a C 2 -C 7 alkylcarbonyl group, at least two of the R 1 groups , R2, R3 representing a hydroxyl group or an alkoxy group, and R4 represents a group containing at least one epoxy functional group, an optionally substituted aryl group, a halogen atom or a group bearing at least one halogen atom, especially fluorine, a group containing at least one aldehyde function, a group bearing at least one function containing a sulfur or phosphorus atom, an acryloxy or methacryloxy group, said group carrying the above functions being a C1-C18, preferably C1-C8, carbon group which may contain at least heteroatom of oxygen or sulfur. It also relates to a screen formed from the glass wire carrying said coating, in particular in the form of a grid, fabric or knit used as a mosquito net.La présente invention se rapporte à un fil de verre pourvu d'un revêtement à base d'un polymère choisi parmi les copolymères acétate de vinyle-chlorure de vinyle, le polychlorure de vinyle et le polychlorure de vinylidène, et qui contient un silane de formule Si(R1)(R2)(R3)(R4) dans laquelle R1, R2, R3, identiques ou différents, représentent un groupement alkyle en C1-C6, un groupement alcényle en C2-C6, un groupement alcynyle en C2-C6, un groupement aryle en C6-C10, un groupement hydroxyle, un groupement alkoxy en C1-C6, un groupement aryloxy en C6-C10, un groupement acyloxy en C1-C6, un groupement alkylcarbonyle en C2-C7, au moins deux des groupements R1, R2, R3 représentant un groupement
