This invention is addressed to an improved size composition for use in the treatment of glass fibers in the manufacture of glass fiber textiles, glass fiber reinforced plastics and glass fiber reinforced elastomeric products wherein the size is formulated to contain, as the essential components, a water-soluble resin formed of maleic anhydride and a conjugated diene, an alkyl acrylate or methacrylate, or a vinyl aromatic monomer, and a glass fiber anchoring agent. Bundles of glass fibers sized with the composition of the invention are particularly well suited for impregnation with an elastomer compatible material containing a resorcinol-aldehyde resin component and an elastomer component for use in the manufacture of glass fiber reinforced elastomeric products.
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