Borated Polyethylene

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Plasti-Shield®  Boron Filled Polyethylene Shielding is a lightweight, cost-effective neutron shielding solution

Plasti-Shield®  Boron Filled Polyethylene Neutron Shielding, supplied by MarShield, is a lightweight, cost-effective neutron shielding solution to attenuate and absorb neutron radiation. Our borated polyethylene contains 5% (2% available on special order) boron content by weight. Used in the medical, nuclear, and industrial marketplaces borated polyethylene is ideal for medical vaults and doors, particle accelerators, hot cells, nuclear storage and transport containers, and nuclear detection systems.

Most radioactive fields consist of different types of radiation. The most common include fast neutron, thermal neutron, primary gamma rays and secondary gamma rays. Plasti-Shield®  is a borated polyethylene designed to attenuate these types of radiations.

  • Fast Neutrons are most effectively shielded by hydrogen. Plasti-Shield®  has an inherently high concentration of hydrogen, over 13% of volume.
  • Thermal Neutrons are shielded by polyethylene with the presence of boron, such as Plasti-Shield®  Industrial Grade with 5% boron by weight.
  • Secondary Gamma Rays are created by the capture of thermal neutrons by hydrogen. These captured gamma rays can be minimized by adding boron, resulting in a significantly reduced energy dosage of only .42 MeV.

For easy installation, MarShield’s borated polyethylene comes in a standard sheet size of 48” x 96” x 1” thick.  You can easily cut this polymer material using standard woodworking tools.


  • Available in 5% (or 2%) boron content
  • Standard sheet size of 48″ x 96″ x 1″ thick (160lbs)
  • Durable over a wide temperature range
  • Consistent density and homogeneity
  • Rated to MIL-P-23536A and EB2562E specifications
  • Used as medical and industrial neutron shielding for more than 25 years.
  • Light-weight, cost-effective and easily fabricated
  • High cross-section for consistent neutron attenuation.
  • Specific Gravity is 0.92.


  • Airport Security and Sea Port Security
  • Medical Vaults
  • Nuclear Reactors
  • Nuclear Storage
  • Nuclear-Powered Vessels & Vehicles
  • Research Applications
  • Linear Particle Accelerators
  • Transport Containers



What is Plasti-Shield?

Plasti-Shield® is an effective shielding material with 5% boron by weight and our trademark purple color to meet all applicable applications for healthcare cancer treatment centers, diagnostic and hospital facilities. Applications include linear accelerators, nuclear or radiation shielding, industrial use, security such as seaports and airport security, nuclear submarines, nuclear power plants, border protection and other applications requiring attenuation of thermal neutrons.

Our process, materials, quality programs, sampling, testing, tracing and packaging all meet or exceed military specifications such as MIL-P23536A and EB2562E. We use MIL-STD-45662 for internal calibration system traceable back to NIST.

What type of finish?

Dull finish on both sides.

What colors are available?

Plasti-Shield® is available in 5% Purple and 2% Red is also available. Custom colors are available. Please call Customer Service at (800) 381-5335.

Can you custom color match?

Yes. Please call Customer Service at (800) 381-5335.

What sizes are available?

Plasti-Shield® standard sheet size is 48” x 96”. Standard gauge is 1”. Custom sheet sizes and gauges available upon request. Please call Customer Service at (800) 381-5335.

What are the Features and Benefits of Plasti-Shield?
  • Neutron Shielding
  • Our process, materials, quality programs, sampling, testing, tracing and packaging all meet or exceed military specifications such as MILP23536A and EB2562E with 2% boron only
How Can I Fabricate and Finish it?

Use standard woodworking tools: table saws, table routers, drills, blades and bits. Carbide router bits with two to four flutes are recommended.

How to Care and Store?
  • Store the sheets flat on a level surface
  • Keep away from teak oil and other products that can stain the finish
  • Use china markers or water-based markers to draw patterns
  • Pen marks can usually be removed with household cleaners
  • Keep away from heat sources that exceed 180°F
  • Because there is no grain, parts can be cut from any area of the sheet
  • Save the scraps for small parts, shims, spacers and plugs
What are common applications?
  • Airport Security and Sea Port Security
  • International Border Security
  • Doors for Linear Accelerators
  • Medical Vaults
  • Nuclear Reactors
  • Nuclear-Powered Vessels
  • Research Applications
Can I use a CNC machine?


Will the material produce dust when fabricating?

No, only small shavings.

Borated Polyethylene Information Sheet