This unique and advanced polymer makes the material 25% stronger than the original King StarBoard®.  King StarBoard ST is scratch-resistant making it an excellent construction material for cabinetry, case goods and architectural partitions. King StarBoard ST is environmentally stabilized and has been developed to withstand the harshest outdoor conditions. It will not warp, rot, or delaminate when exposed to humidity or water. It can be fabricated using common woodworking tools and techniques.

King StarBoard® ST XL is available in a lighter version as a custom product. King StarBoard ST XL sheets are up to 30% lighter in weight than King StarBoard ST and are made with the same textured surface and colors for a perfect match.

King StarBoard ST is upgradable to King MicroShield® with an exclusive antimicrobial additive, the latest technology for protecting the product surface against stain and odor causing bacteria, algae and fungi.

King StarBoard ST is upgradable with King FlameShield, for ASTM E-84 Class A or B Flame/Smoke Compliance and CAN/ULC-S102 for Canadian Compliance.

For more information about King MicroShield and King FlameShield, please visit those product pages.


Standard Sheet Size

in:48″ x 96″
mm:1219mm x 2438mm

Standard Gauges


Approximate Weight

lbs:40 lbs60 lbs80 lbs120 lbs160 lbs240 lbs

Tolerance information:
Gauges 1/4″ up to 1-1/2” ± 5% | Length and width plus only at room temperature

Custom sheet sizes, gauges and colors available

Physical Properties
PropertiesUnitsASTMNominal Values
Tensile Strength @ YieldpsiD638>4,500
Tensile ModuluspsiD638318,000
Elongation @ Break%D638>600
Elongation @ Yield%D6388.8
Flexural ModuluspsiD790225,000
Flexural Stress @ 5% StrainpsiD7904,480
Compressive Properties 10% StrainpsiD6954,790
DurometerShore DD224069
Tensile Impactft.lbs./in.2D182299
Izod Impact Resistanceft.lbs./in.2 D2561.4
Brittleness Temp.ºC (ºF)D746<-75ºC (<-103ºF)
Vicat SofteningºC (ºF) D1525 132ºC (270ºF)
Heat Deflection Temp. 66 psiºC (ºF) D648 84ºC (183ºF)
Screw and Nail WithdrawallbsD1761755 & 55

*All values are determined on specimens prepared according to ASTM standards.
Nominal values should not be interpreted as specifications.
King StarBoard® ST is made entirely from FDA and made with USDA approved materials.
King StarBoard® ST meets ASTM 4976.
King StarBoard® ST contains no VOC’s.


Additional Information

Protect Your Interests with E-84 Class A or B Flame Compliance Polymer Sheets from King Plastic Corporation
Available in King StarBoard® Products

The ASTM E84

This test method is intended to compare the surface flame spread and smoke developed measurements to those obtained from the tests of mineral fiber cement board and select grade red oak flooring. The results are expressed as Flame Spread Index and Smoke Developed Index.

Class A Interior Finish:

Flame Spread Index 0-25, Smoke Developed Index 0-450. Includes any material classified at 25 or less on the flame spread test scale and 450 or less on the smoke developed test scale. Any element thereof when so tested shall not continue to propagate fire.

Class B Interior Finish:
Flame Spread Index 26-75, Smoke Developed Index 0-450. Includes any material classified at 25 but not more than 76 on the flame spread test scale and 450 or less on the smoke developed test scale.

ASTM E84 Class A Certification| ASTM E84 Class B Certification | FlameShield Physical Properties Sheet | FlameShield MSDS