Abstract: A method and product to replace asbestos in brake pads and other molded friction materials. Conductive fibers and non-conductive fibers, both of small diameter and an average length less than two inches (5 cm), are mixed together in predetermined ratio to facilitate uniform suspension of friction materials in a moldable mixture. Steel, copper, or brass are preferred for the conductive fibers; aramid and acrylic resins are preferred for the non-conductive fibers.

Abstract: A method of manufacture of a radial-flow filter particularly suitable for use as an input filter in a subterranean fluid (oil, gas, water) well starts with a length L of multi-perforate pipe, which may be an integral part of the production tubing of the well. The pipe is mounted in an engine lathe with the perforated length L between the headstock and the tailstock of the lathe. With the pipe rotating, a strip of metal wool, preferably stainless steel wool, is wrapped around the pipe in repeated, overlapping helical layers each aligned at an acute angle X to the pipe axis, with adjacent layers angularly displaced by an angle 2X. The completed filter may have a tubular wire mesh around the pipe, between the pipe and the innermost layer of steel wool, and a multi-perforate sheath over the outermost layer of wool.