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Marine grade HDPE is formulated to meet the specific requirements of marine and other outdoor environments. Special postproduction treatment enhances its ability to withstand the effects of salt water, moisture, and direct sunlight. Like regular HDPE, this material exhibits high impact strength as well as excellent tensile strength, energy absorption, abrasion resistance, and resistance to stress cracks.

In addition to its resistance to marine and other outdoor conditions, Marine grade HDPE has a decorative, textured surface that does not show wear, dirt, or scratches and is available in a variety of colors. Marine grade HDPE is manufactured as a continuous extrusion; therefore, it is guaranteed not to delaminate during the service-life of the end-product. It also meets FDA approval for direct food contact.

Brand Names

  • King Starboard
  • SeaBoard™ Lite
  • SeaBoard™
  • Seaboard™ GripX
  • Densetec 400
  • King Starboard® XL
  • King Starlite XL
  • King Starboard AS
  • King Starboard ST

Emco Industrial Plastics doesn’t claim to represent all of the manufacturers or trade name products listed. This list is intended as a guide of typical materials available for purchase from Emco Industrial Plastics, Inc. For additional information, contact an Emco Industrial Plastics representative at (800) 292-9906.

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At a Glance

Generic Name
Polyethylene, Machine Grade

Available In

L-P 390C, ASTM D1248, ASTM 3350

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Technical Information

Stock Products Properties Applications Advantages Grades

Stock Products

Sheet 1/4″ – 1″ TH Standard; 48″ x 96″, CTS White, Black, Gray, Colors


Physical PropertiesUnitsASTMResults
Density lb/in3 D792 29.4 – 28.7
Water Absorption. 24 hrs % D570 <0.01

Give us your cut-to-size dimensions. We will precision-cut these plastics to your exact size. Additional sizes and colors available upon request.

Mechanical PropertiesUnitsASTMResults
Tensile Strength @yield psi D638 3.100 – 5.500
Tensile Modulus psi D638 0.6 – 1.8
Tensile Elongation @Break % D638 20 – 1.000
Flexural Modulus psi 400000 1.0 – 2.0
Hardness. Shore D D785 D69
IZOD Impact Strength Notched ft-lb/in D256 3
Thermal PropertiesUnitsASTMResults
Coefficient of Linear Thermal Expansion (x 10-5 in./in./°F) D256 6.1 – 7.2
Heat Deflection Temp at 66 psi °F D648 140 – 190
Heat Deflection Temp at 264 psi °F 110 – 130
Melting Temperature °F D3418 260
Max Operating Temp °F 180
Thermal Conductivity BTU-in/ft2-hr-°F C177 11.0 – 12.4
Electrical PropertiesUnitsASTMResults
Dielectric Strength V/mil D149 450 – 500
Dielectric Constant D150 2.30 – 2.35@1 kHz
Dissipation Factor D150 0.0003 @1 khz
Volume Resistivity. 50% RH ohm-cm D257 10^5
Arc Resistance sec D495 200 – 250
Optical PropertiesUnitsASTMResults
3mm Transparent Clear Transmittance. Total (%) % D1003 1.54
Refractive Index % D542 18537

NOTE: The property values presented above are typical values intended for reference and comparison purposes only. They should NOT be used as a basis for design specifications or quality control. Contact us for manufacturers’ complete material property datasheets. All values at 73°F (23°C) unless otherwise noted.


  • Pipe reducers. flanges. end caps
  • Sumps
  • Tanks. Chutes and Bin Linings
  • Milled flange adapters
  • Lifting lugs


  • High Chemical Resistance
  • Good Abrasion Resistance
  • Low Specific Gravity (Floats in Water)
  • Good impact resistance
  • High Tensile strength
  • Low coefficient of friction
  • Easy to machine with conventional tools


  • HDPE Marine Grade
  • HDPE FDA Approved Grade
  • HDPE Pipe Grade
  • UHMWPE (ultra high molecular weight PE)
  • HMWPE (high molecular weight polyethylene)
  • HDXLPE (high density cross-linked PE
  • PEX (cross-linked PE)
  • MDPE (medium density PE)
  • LDPE (linear low density PE)
  • VLDPE (very low density PE)

NOTE: Several grades of this material are available. For additional information regarding this plastic, contact your Emco Industrial Plastics representative or call (800) 292-9906.

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