Impulse heat bar sealers are the most common and safest sealing systems in use today. They work with a wide variety of materials. Using either bar, the heating element is heated during the heat cycle. When that cycle is over, an optional cooling cycle begins, cooling the seal under pressure. Our impulse heat bar sealers, available in a variety of sizes and price points, are known for their ability to produce uniform consistent hermetic seals in most poly films.