What kind of material(s) would make a good friction disk, or disks, for a friction hinge, or torque hinge? This will be for the hinge on an arm that needs to be adjustable and also hold it's position with 1 to 10 pounds on the end. The hinge may be a vertical tilt hinge or a horizontal swivel joint.
The two pieces that will swivel against each other are flat metal with 2 surfaces of 1.5 inch diameter of overlap where the friction disk will be. I plan to use a bolt with a spring washer to supply the pressure.
The specifics above are to give an idea of the scale of the forces. My question is generally about what materials are used for friction disks.
Brass or nylon washers are sometimes used for hinges or joints when you don't want friction. I want the opposite of that - I want friction.
I want something durable enough that won't wear out quickly or disintegrate, and grippy enough to hold without slipping. The hinge may be repositioned several times per day. The worst thing would be a hinge that slowly slips over time.
Ideally, the materials would slide without making noise, like scratching or grinding sounds.
Edits: I reduced the weight from 40 down to 1-10 lbs.