King StarBoard® is the original marine-grade high-density polyethylene sheet and the industry standard. It is the product of a proprietary process called K-Stran™, the most advanced manufacturing process for superior flatness and consistency. King StarBoard is environmentally stabilized to withstand the harshest marine conditions. It will not warp, rot, or delaminate when exposed to humidity or water. King StarBoard is easy to fabricate with standard woodworking tools and requires little or no finishing.

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

King StarBoard 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.

Active ingredient (Biosafe®)………………….antimicrobial siloxane EPA Reg. No. 83019-1

*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.

Biosafe® is a registered trademark of BIOSAFE, Inc.: Patent number 7,851,653 and 7,858,141. 

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Standard Sheet Sizes

in: 48” x 96” 54” x 96”
mm: 1219mm x 2438mm 1371.6mm x 2438mm
Colors Only in 1-1/2” gauge, all standard colors available All standard colors available

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 48 x 96 (only in 1-1/2″ gauge)

lbs: 240 lbs
kg: 108.6kg

Approximate Weight 54 x 96

lbs: 45 lbs 67.5 lbs 90 lbs 135 lbs 180 lbs
kg: 20kg 31kg 41kg 61kg 81kg

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
Properties Units ASTM Nominal Values
Density g/cc D1505 0.955
Tensile Strength @ Yield psi D638 >4,100
Tensile Modulus psi D638 255,000
Elongation @ Break % D638 >600
Elongation @ Yield % D638 9.8
Flexural Modulus psi D790 185,000
Flexural Stress @ 5% Strain psi D790 3,810
Compressive Properties 10% Strain psi D695 4,950
Durometer Shore D D2240 68
Tensile Impact ft.lbs./in.2 D1822 115
Izod Impact Resistance ft.lbs./in.2  D256 1.1
Brittleness Temp. ºC (ºF) D746 <-76ºC (<-105ºF)
Vicat Softening ºC (ºF)  D1525  123ºC (253ºF)
Heat Deflection Temp. 66 psi ºC (ºF)  D648  75ºC (167ºF)
Screw and Nail Withdrawl lbs D1761 657 & 63
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® is made entirely from FDA and made with USDA approved materials.
King StarBoard® meets ASTM D4976.
The raw material used to make King StarBoard® does not contain BPA’s or Phthlates.


Additional Information
  • Made of the finest polymers available, using our
    proprietary K-Stran process for superior flatness
    and consistency.
  • Environmentally stabilized for harsh sun and tough
    marine environments.
  • Will not rot, swell, splinter or delaminate when exposed
    to humidity or water.
  • Precise tolerances ensure consistent color, thickness and
    density, even for special thickness gauges and custom
    order colors.
  • Easy to fabricate with standard woodworking tools and
    requires little or no finishing.
  • Available in eight standard colors to match or accent
    any gelcoat.
  • Unlimited custom/proprietary colors.
  • Durable matte-textured surface on both sides.
  • Easy to clean and never needs refinishing.
  • Edges finish cleanly and easily.
  • Forms easily for smooth curves.
  • Has passed the Federal Motor Vehicle Standard 302 fire
    test required for use in motor vehicles, including
    motor homes.
  • Available in large sheets up to 54” x 96” or 48” x 96”.
  • Custom sheet sizes available.
  • Shipped with a protective masking on one side.
  • Proven on thousands of boats and yachts.
  • Experienced boat builders and boaters know the King StarBoard® brand and trust it more than any other.