Polybutylene terephthalate composition with improved hydrolytic stability

A thermoplastic composition with improved hydrolytic stability, comprising:

• 10 to 30 percent by weight of polybutylene terephthalate (PBT) having a carboxylic end group concentration (CEG) of 40 to 50 mmol/kg, and an intrinsic viscosity of 1.15 to 1.25 dl/g as measured in a 60:40 phenol/tetrachloroethane;
• 30 to 50 percent by weight of a polybutylene terephthalate (PBT) having a carboxylic end group concentration (CEG) of 50 to 120 mmol/kg and an intrinsic viscosity of 0.63 to 0.68 dl/g as measured in a 60:40 phenol/tetrachloroethane;
• 25 to 35 weight percent of a reinforcing filler;
• 0.01 to 0.1 percent by weight of a catalyst;
• 0.01 to 5 percent by weight of an epoxy chain extender;
• 0.01 to 0.1 percent by weight of a hindered phenol stabilizer;
• and
• 0.1 to 10 percent by weight of a mold release agent;
• wherein all weight percents are based on the total weight of the composition;
• and
• wherein the melt volume flow rate as measured by ISO 1133 at 250° C. with 5 kg load and 300 s dwell time of the thermoplastic composition when subjected to 80° C. and 70 percent room humidity after 500 hours is between 52 and 62 cm3/10 min, and the melt volume flow rate percent change compared to an initial melt volume flow rate of the thermoplastic composition is between 20 and 40 percent.