When you need a tough and robust enclosure solution, and metal is not an option, then Glass Reinforced Polyester (GRP) enclosures are an obvious choice for ultimate reliability. GRP enclosures are just as robust as the standard diecast aluminium types but are lighter in weight and provide excellent electrical insulation properties. They have a very high surface resistance making them ideal for high voltage applications. Also, they are easier to machine and customise than their aluminium counterparts.