Abstract
Vacuum Insulation Panels(VIPs) have been regarded as a super thermal insulation material with a thermal resistance of about
5-8 times higher than that of equally thick conventional polyurethane boards. In this paper, the researches on factors influencing
interior pressure in VIPs, including gas and water vapor permeation through the barrier and outgassing of the core materials, were
reviewed respectively. Following this, aiming at the outgassing from open cell PU foam, the specific outgassing rate of the core
material is tested not only at room temperature but also at low and high temperatures by an orifice known-conductance method.