This unique and advanced polymer makes the material 25% stiffer than the original King StarBoard®. King StarBoard® ST is our most scratch-resistant polymer 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 advanced antimicrobial 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.
Disclaimer: King MicroShield® may affect color. King FlameShield may affect finish and color.
*For bacteriostatic, fungistatic, & algistatic properties. This product is exempt from registration under 40 CFR 152.25(a). King MicroShield® 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.
Standard Sheet Size
| in: | 48″ x 96″ |
| mm: | 1219mm x 2438mm |
Standard Gauges
| in: | 1/4″ | 3/8″ | 1/2″ | 3/4″ | 1″ | 1-1/2″ |
| mm: | 6.4mm | 9.53mm | 12.7mm | 19mm | 25.4mm | 38mm |
Approximate Weight
| lbs: | 40 lbs | 60 lbs | 80 lbs | 120 lbs | 160 lbs | 240 lbs |
| kg: | 18kg | 27kg | 36kg | 54.4kg | 72.5kg | 108.6kg |
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
| Properties | Units | ASTM | Nominal Values |
| Density | g/cc | D1505 | 0.963 |
| 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 | 132ºC (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 standards.
Nominal values should not be interpreted as specifications.
King StarBoard® ST is made entirely from FDA and USDA approved material.
King StarBoard® ST meets ASTM 4976.
King StarBoard® ST contains no VOC’s.
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.
Results
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
Black 
Mocha Brown 
Evergreen 
Everglade 
Charcoal Gray 
Dolphin Gray 
Sanshade 
Seafoam 
White/White 
