Borated Polyethylene: a neutron shielding material used medical and industrial applications. Professional Plastics offers borated polyethylene is various sizes, grades, brands and concentrations. Types & Grades of Borated Polyethylene: Densetec HDPE – Borated Sheet (5% Borated – Green Color) Densetec Borated Sheet is a product specially designed for nuclear shielding applications. The material employs 5% Boron by weight to shield neutrons in a variety of applications including high intensity X-rays, cancer treatment facilities, nuclear submarines, and nuclear power plants. King Plasti-Shield® Borated Polyethylene (5% Borated Purple Color) King Plasti-Shield® has been used as medical and industrial neutron shielding for more than 25 years. It is a light-weight, cost-effective and easily fabricated solution for a wide variety of neutron-shielding needs. Compared to paraffin-based products, King Plasti-Shield sheets are durable and perform well in a wider range of temperatures. King Plasti-Shield® is offered in three grades: Industrial Grade (PURPLE COLOR, 5%* Boron by Weight) W is effective in medical and other applications requiring attenuation of thermal neutrons. Grade III (RED COLOR, 2%* Boron by Weight) W Grade II (YELLOW COLOR, 1%* Boron by Weight) W – Virgin Polyethylene (natural color) Grade II (yellow, 1% boron) and Grade III (red, 2% boron) are used as neutron shielding in the construction and repair of US Navy ships. These products are manufactured to MIL-P-23536, Rev. A. Certification and testing is available to meet MIL-Spec. requirements