Improved polyphenylene ether-based compositions are described, which also contain polystyrene; selected amounts of glass fibers and inorganic nonfibrous agents such as clay or mica; carbon fibers or metal-coated graphite fibers; and certain diphosphate- or polyphosphate-based flame retardant compositions. The compositions, which can be injection-molded, exhibit excellent electrical dissipation characteristics, as well as excellent flame retardancy (without cracking or 'juicing'); heat distortion temperature characteristics; tensile yield; and flexural modulus. Specific methods for preparing such compositions also contribute to their enhanced performance. Furthermore, the compositions may be foamed.
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