Nylon Felt is nominally rated. The fabric is singed to prevent breaking of fibers during filtering. Nylon felt is not as easy to clean as mesh but can still be cleaned. Generally, this felt is meant to be thrown away after it is clogged. Nylon has an excellent rating with water, vegetable oils from animals and plants, petro-oils, organic solvents. Nylon has a good rating with Alkalis, Organic acids, mineral acids and oxidizing acids.