Electrolube ur5547 twin pack polyurethane resin electrolube ur5547rp500ge this product has been formulated to give a semi rigid flame retardant casting resin for use in potting or cable jointing applications polyurethane resins are softer and more flexible than epoxies and therefore cause less stress on delicate components electrolube ur5547rp500ge general purpose polyurethane resin 500g twin pack