Heat Sealer with Cutter This impulse heat sealer is manufactured for polythene up to 400 mm wide and has a 12-month warranty covering non-consumable parts and labour. The sealers are ideal for use with lay-flat polythene tubing, producing bags to size for product packaging. Impulse heat sealers use upper and lower heating elements. This easy to handle heat sealer is designed to seal polythene bags or lay-flat polythene tubing up to 400 mm wide. The machine comes with a 12-month warranty covering non-consumable parts and labour.