King MediGrade® is a super tough, high-density polyethylene building sheet with an advanced antimicrobial technology for protecting the product surface against stain and odor causing bacteria, algae and fungi. Unlike surface antimicrobials, King Plastic’s advanced antimicrobial technology protects against bacterial degradation for the lifetime of the product. It is the product of a proprietary process called K-Stran™, the most advanced manufacturing process for superior flatness and consistency. King MediGrade® has a matte gloss finish on both sides of the sheet. It is environmentally stabilized to withstand the harshest outdoor conditions. King MediGrade® will not rust, delaminate or rot when exposed to UV, humidity or water. Healthcare facilities, medical equipment and case goods made with King MediGrade® will stay cleaner and fresher between cleanings. Studies have shown that surfaces with the antimicrobial technology can inhibit the amount of certain product-damaging bacteria by 99.99%* compared to an untreated surface. The polymer sheet never needs painting or refinishing, works like wood and is easy to fabricate using common woodworking tools and techniques.


King MediGrade® with Advanced Antimicrobial Technology


Where to Buy



Standard Sheet Size

in: 48” x 96”
mm: 1219 mm x 2438 mm

Standard Gauges

in: 1/4″ 1/2” 3/4”
mm: 6.4 mm 12.7 mm 19 mm

Approximate Weight 

lbs: 40 lbs 80 lbs 120 lbs
kg: 18.14 kg 36.3 kg 54.4 kg


Tolerance information:

Gauges 1/4″ up to 3/4″ ± 5%
Length and width plus only at room temperature

Custom sheet sizes, gauges, and colors available upon request

Disclaimer: Antimicrobial additive may affect color.

*For bacteriostatic, fungistatic, & algistatic properties. King MediGrade® is exempt from EPA registration under 40 CFR 152.25(a) (commonly known as the “treated article exemption”). The active ingredient in King MediGrade® is EPA registered and accepted for use in polymers and plastics. King MediGrade® effectiveness verified by ISO and ASTM standards. This product does not protect users or others from disease-causing bacteria. Always clean this product thoroughly after use.

Physical Properties
Properties Units ASTM Nominal Values
Density g/cc D1505 0.96
Tensile Strength @ Yield psi D638 >4,500
Tensile Modulus psi D638 318,000
Elongation @ Break % D638 >600
Elongation @ Yield % D638 8.8
Flexural Modulus psi D790 225,000
Flexural Stress @ 5% Strain psi D790 4,480
Compressive Properties 10% Strain psi D695 4,790
Durometer Shore D D2240 69
Tensile Impact ft.lbs./in.2 D1822 99
Izod Impact Resistance ft.lbs./in.2 D256 1.4
Brittleness Temp. ºC (ºF) D746 <-75ºC (<-103ºF)
Vicat Softening Temp. ºC (ºF) D1525 172ºC (270ºF)
Heat Deflection Temp. 66 psi ºC (ºF) D648 84ºC (183ºF)
Screw and Nail Withdrawal lbs D1761 755 & 55
Flammability Rating UL94 HB

All values are determined on specimens prepared according to ASTM.
Nominal values should not be interpreted as specifications.
King MediGrade® is made entirely from FDA and made with USDA approved materials. King MediGrade® meets ASTM D4976.
King MediGrade® contains no VOC’s.

Additional Information

King Advanced
Antimicrobial Technology



Mode of Action

Physically ruptures the cell membrane

Releases ionic free radicals
that react with cell DNA and disrupt the critical life
processes in the cell

Releases toxic bischlorinated phenol (PBC) for consumption or cellular absorption, causing lethal mutations in the cell

Leaching: Bleeding onto the user, into the water, and into the environment

No leaching

Leaches for its mode of action

Must leach to work

Leaches for its mode of action

Must leach to work



Service life 1-3 years

Service life 1-3 years



The cost of silver is high



Bacteria, fungi and algae that cause stains and odors

Action variable based on
concentration and test or
use conditions

Action variable based on concentration and test or use conditions

Log Reduction(1-6,
1 being the lowest,
6 being the highest)

4 on 24 hour test &
2 hour test

1-2 on a 24 hour test

2 on a 24 hour test


World wide

Varies by company

Not accepted or available in certain areas of the world