Double Impluse foot impulse sealers for sealing plastic bags. Impulse sealers fire a short impulse of electricity through a specially designed heating element to seal the open end of bags. The length of the seal time will depend on the type and thickness of the bag being sealed as well as the type of sealer. Our sealers seal poly bags and any thermoplastic material such as polyethylene (PE) and polypropylene (PP) quickly and efficiently. Other materials also may be sealed. No warm up time is needed. The double impulse models have heating elements on both the top and bottom of the seal bar, designed for sealing thicker, harder to seal materials.