Impulse sealers are made to seal a variety of plastics. They are very useful and found around the world. The most popular packaging used with impulse sealers is shrink wrap packaging and polyethylene packaging. For shrink wrap packaging, the most popular impulse sealers used are round wire sealers. Most companies sealing polyethylene bags and tubing commonly use a flat wire impulse sealer or a flat wire impulse sealer with a cutter blade.