Fiber Reinforced Pressure Compensator Diaphragm

A drill bit for drilling a wellbore, the drill bit comprising:

• a body having at least one bearing;
• a rotary cone rotatably attached to the body at the at least one bearing;
• a lubricant reservoir located in an inner portion of the body, the reservoir being in fluid communication with the bearing;
• a communication port that leads from the inner portion of the body to the exterior of the body;
• and
• a pressure compensator diaphragm that separates lubricant in the lubricant reservoir from the communication port, the diaphragm being formed of a fluorocarbon elastomer (FKM) material having aromatic polyamide fiber particles dispersed therein.