This paper describes experiments conducted in the framework of a research project aimed at finding suitable barrier films for vacuum insulation panels (VIPs), which are used for applications in the cooling industry (especially for ducts in liquified natural gas [LNG] installations) and in the building industry. It explores the heat seal strength of four makes of film used for this purpose. A secondary purpose was to investigate the influence of the heat seal parameters on the heat seal strength of the tested films. The heat seals were tested at room temperature and at -130°C, from which it readily became clear that the heat seal parameters can be chosen freely within certain limits.