Standard GW bars are UPT heat sealing bars for use in normal conditions, in other words neither damp nor corrosive. These bars are shipped with heating line lengths from 100 mm to 500 mm in 50 mm steps. They can also be supplied with heating line lengths from 500 mm to a maximum of 1000 mm in 100 mm steps. Heating line widths of 2.8 mm, 4.8 mm and 6.0 mm are available as standard.