Impulse heat sealers available from Get Packed (18/08/2008)... hold downs.Impulse heat sealers are ideal for sealing polypropylene and polythene bags and tubing as well as shrink film including PVC or polyolefin.Customers can choose sealing lengths from 100mm, 200mm, 300mm, 400mm, 450mm, 600mm, 800mm ...