The Neutron shielding manufactured for RAL uses Boron Carbide grit (commonly referred to as B4C) mixed with resin in varying ratios and cast in moulds. Mixing with resin is an easier and more cost effective method of fabrication than sintered pieces and is therefore more commonly used.

Brookvine's work with RAL has led to the development of various types of mouldings: from the crispy mix which has very low resin content for in vacuum applications to minimise out-gassing from the resin, to the higher resin content required for smaller more complex castings.