Abstract: A reinforced poly(arylene sulfide) polymer composition comprising (a) a poly(arylene sulfide) polymer, (b) a hydroxyl-functionalized reinforcing material, and (c) an ureido silane coupling agent comprising a compound represented by Formula IV and/or a compound represented by Formula V: H2N—CO—NH—CmH2m—Si(OR5)3??Formula IV H2N—CO—NH—CxHy—Si(OR5)3??Formula V wherein m is an integer with a value of equal to or greater than 1; wherein x and y both are integers; wherein x has a value of equal to or greater than 1; wherein y has a value of equal to or greater than 2; wherein R5 is any hydrocarbon functionality; wherein the hydroxyl-functionalized reinforcing material is present in the reinforced poly(arylene sulfide) polymer composition in an amount of from about 30 wt. % to about 45 wt. %; and wherein the ureido silane coupling agent is present in the reinforced poly(arylene sulfide) polymer composition in an amount of from about 0.1 wt. % to about 1 wt. %.