Below is a list of Teflon Seals manufacturers from East Longmeadow, Massachusetts. Teflon seals are often thin, round pieces with a large hole in the middle, usually manufactured by stamping sheets of material. Chemical plants, petroleum refineries, oil and gas drillers, refrigeration units, furnace systems and a wide variety of industrial machinery use seals made of Teflon to reduce friction or keep an area watertight.