Low-weight and water-resistant honeycomb sandwich panels made by resign transfer molding process

摘要

The instant invention pertains to a low-weight and water-resistant composite panel made from an open cell core, such as honeycomb, using the resin transfer molding (RTM) process. The open cell core is sealed to a degree of at least 95 %, and even up to 100 %, by use of a resin/moisture barrier before the liquid resin is injected into the fibrous reinforcement This prevents resin fill into the open cell core during the RTM process and isolates the core from water migration after the structure is put into service.