30% off Fusion 360 + $400 SendCutSend Gift Card

30% off Fusion 360 + $400 SCS Gift Card


Sometimes called marine board, HDPE plastic is petroleum-based and suitable for myriad applications where impact resistance and low moisture absorption are critical to structural integrity. This easily moldable  material has a staggering list of usages from medical to nautical. You can expect a textured finish on both sides of HDPE.

Commonly used as an alternative to wood in harsh environments.  

  • Available thicknesses are .250″, .375″, and .500″
  • CNC routed plastic (+/- .005″ cutting tolerance)
  • 2-4 day lead time before shipping

Custom HDPE parts starting from $29

Low Moisture Absorption

What is HDPE?

HDPE (High-Density Polyethylene) is a thermoplastic that belongs to the polyolefin group of materials and is commonly used as a replacement for wood in marine applications. Sometimes you’ll hear it referred to as “plastic lumber” because of its excellent impact resistance, low moisture absorption, and high tensile strength.

This material is lightweight but tough, making it great for applications such as marine surfaces and bulkheads, industrial containers, structural components, and washers. And if that wasn’t enough, it’s especially useful in marine applications because of its non-toxic and non-staining nature.

Available Services:

When wood won’t cut it: Try HDPE

HDPE boards are long-lasting, low maintenance, and safe, making them a healthy addition to your project. Resistant to molds, mildew, and other forms of rot, this material is uniquely suited for conditions where water transport or exposure are major factors. It’s able to be effectively sterilized and as such is used in many food and beverage applications. Wildly enough, this petroleum-based plastic is even used in reconstructive surgeries. 

What can you make with HDPE?

Water isn’t the only liquid this material is compatible with. HDPE is a great choice for use with the most common chemicals, solvents, acids, detergents, and cleaning fluids. And if you’re still not sold, it’s easily recycled, has an amazing strength-to-density ratio, and has extreme corrosion resistance. 

The best part? You don’t need to know how to cut it, we’ll take care of that for you.

Get started with a free instant quote!

Material Details

.250″ HDPE

Advertised Thickness .250″ | 6.35mm
Gauge N/A
Thickness Tolerance Positive .013″
Thickness Tolerance Negative .012″
Cutting Process CNC Router
Cut Tolerance .005″
Top/Bottom Finish Identical both sides
Available Operations
Deburring No
Bending No
Countersinking Yes
Tapping Yes
Anodizing No
Plating No
Powder Coating No
Hardware No
Design Considerations
Min Part Size 1″ x 2″
Max Part Size 44″ x 30″
Min Hole Size (CNC Bit Size) .125″
Min Bridge Size .250″
Min Hole to Edge Size .075″
Tab and Slot Tolerance .020″
Min Part Size Countersink 1″ x 4″
Max Part Size Countersink 14″ x 46″
Countersink Min Minor .130″
Countersink Max Major .656″
Countersink Min Hole Center to Material Edge .453″
Smallest Tap M4 X 0.7
Largest Tap 1/2-20
Min Tapping Part Size 1″ x 1.5″
Max Tapping Part Size 36″ x 46″
Tapping Min Hole to Edge .125″
Tapping Min Hole Center to Material Edge Tap hole size/2 + .125″
Density 59.27 lbs/ft^3
Tensile Strength (Ultimate) 3.4 ksi
Tensile Strength (Yield) 4 ksi
Dielectric Strength (V/mil) 1/8″ 450 – 500
Shear Modulus 120 ksi
Comprehensive (Crushing) Strength 3 ksi
Impact Strength (Notched Izod) 4.8 ft-lb/in
Rockwell Hardness R65
Elongation at Break 100%
Elastic Modulus 150 ksi
Flexular Modulus 175 ksi
Thermal Conductivity 0.26 BTU/h-ft- °F
Melting Point 260 °F
Vicat Softening Temperature 160 °F
Continuous Service Temp (Operating), °F (mainly for plastics) (MAX) 180 °F
Magnetic No

Our CNC cut HDPE is guaranteed

We guarantee awesome quality parts. If you’re not 100% happy, we’ll give you a refund or remake on the spot – no questions, no hassle.

Plastic, composite, and wood materials cut on our CNC machine will have small tabs.

These tabs hold your parts in place while being cut to ensure the best accuracy possible. Click below to learn what to expect and how to best design with these tabs in mind.

Start your first SendCutSend project today!

Upload your CAD design or use our parts builder and get a free instant quote on your custom laser cut parts, all delivered to your door in a matter of days.

We proudly use hardware by PEM

Flush stud, M8 x 1.25, .472" Zinc plus Clear Chromate

Thread SizeM8 x 1.25
Hole size in sheet (+0.003/-.0.000).315″
Minimum sheet thickness0.94″
Maximum sheet thickness.347″
Fastener materialSteel
Minimum distance hole C/L to edge0.378″
When determining the distance between two or more fasteners, you can calculate the distance by the formula, C/L to edge + 1/2 the diameter of the second mounting hole..535″
Recommended panel materialSteel/Aluminum
Coating typeZinc
Aluminum material ranges (5052, 6061, 7075)0.100″-0.250″
Steel material ranges (CRS, HRPO, HR)0.104″-0.250″

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We proudly use hardware by PEM

Flush Standoff, 4-40, .250" Zinc plus Clear Chromate

Thread Size4-40 x .250″
Hole size in sheet (+0.003/-.0.000).168″
Minimum sheet thickness0.040″
Maximum sheet thickness.125″
Fastener materialSteel
Minimum distance hole C/L to edge0.230″
When determining the distance between two or more fasteners, you can calculate the distance by the formula, C/L to edge + 1/2 the diameter of the second mounting hole..314″
Recommended panel materialSteel/Aluminum
Coating typeZinc
Aluminum material ranges (5052, 6061, 7075)0.040″-0.125″
Steel material ranges (CRS, HRPO, HR)0.048″-0.119″