These heat sealers are ideal for low volume bag sealing and for widths up to 500 mm wide. They are impulse sealers that apply heat via the element wire for only a second before the mechanism begins to cool the seal. The heat sealer has an adjustable timer but no cutting blade. There are four sizes of heat sealer available: 200, 300, 400 and 500 mm sealing widths which produce a 2 mm wide seal. Recommended for two layers of polythene film (PE film), each up to 150 micron / 600 gauge thick.