The following minimum requirements for this material might include: 1. Dynamic and static coefficients of friction higher than 0.2 in engagement. 2. Preferably higher dynamic coefficient of friction than static coefficient of friction. 3. Chemical resistance to fluids. 4. Wide operating ranges for temperature, pressure and speed with a range of power density of 0.5 to 6 watts/mm2. 5. The thickness range between 0.5 mm to 1 mm. What might this important material be? Guidelines for the Question of the Day: 1. No Piston Cup Lapel Pin will be awarded to the same person within 14 days of a previous award. 2. Please respond with a complete sentence. 3. Please do not post links. If a question arises as to the need for clarification, then sources and links may be requested. 4. Please, no off topic posts.