King Plasti-Shield® is a borated polyethylene neutron shielding material. It is the product of a proprietary process called K-Stran™, the most advanced manufacturing process for superior flatness and consistency of 1” thick. Custom sheets, blocks and slabs can be made as a special order in the compression mold or extrusion mold. King Plasti-Shield® has a smooth finish on both sides of the sheet. It is made with 5% boron by weight and our trademark purple color. King Plasti-Shield® is an effective shielding material 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. The polymer sheet never needs painting or refinishing, works like wood and it is easy to fabricate using common woodworking tools and techniques.

Where to Buy


Standard Sheet Size

in: 48″ x 96″
mm: 1219mm x 2438.4mm

Standard Gauge

in: 1″
mm: 25.4mm

Approximate Weight

lbs: 174 lbs
kg: 78.925kg

Tolerance Information:


Gauge 1” ± 5% | Length and width plus only at room temperature


Custom sheets, blocks and slabs available in standard or custom colors

Physical Properties
Properties Units ASTM Nominal Values
Density (5% Borated) g/cc D1505 0.98
Tensile Strength @ Yield p.s.i. D638 3,960
Durometer Shore D D2240 66
Vicat Softening ºC (ºF) D1525 89ºC (192ºF)

*All values are determined on specimens prepared according to ASTM Standards.
Thickness required to attenuate a neutron beam by a factor of 10.

Material Density Thickness
Water 1.0 8.8″
Concrete 2.4 9.6″
HD Concrete 3.5 9.6″
Iron 7.9 5.7″
Lead 11.3 7.8″
King Plasti-Shield 5% 0.98 8.0″

The above table is for illustration only, designers of radiation shielding must always consult an engineer to determine the shielding requirements for the specific application.

Custom and proprietary colors available with appropriate minimum order.

Nominal values should not be interpreted as specifications.