Technical Specifications
| Material Type | High Density Polyethylene (HDPE) |
| Surface Finish | Textured / Matte (both sides) |
| Density | ~0.95 g/cm³ |
| Tensile Strength | 26–33 MPa |
| Tensile Modulus | ~0.8–1.2 GPa |
| Flexural Strength | ~25–30 MPa |
| Impact Resistance | Excellent |
| Water Absorption | <0.01% |
| UV Resistance | Excellent (UV-stabilised) |
| Chemical Resistance | Excellent |
| Operating Temperature | -50°C to +80°C |
| Melting Point | ~130°C |
| Recyclability | 100% recyclable |
Certifications & Downloads
Seaboard HDPE (Marine Plastic)
Seaboard® Marine HDPE – Designed for harsh marine environments, Seaboard Marine is a UV-stabilised high-density polyethylene sheet that resists saltwater, moisture, and sun exposure. Perfect for…
Optional finishing services - toggle any you need.
Optional. Add drilled holes to your piece.
Acrylic only - optical-grade edge finish
Pick which edges to polish.
Flame polish is only available on acrylic.
Manual router - per-corner price scales with thickness
Rounded or 45 degree bevel - per-metre rate x thickness
Why choose Seaboard HDPE (Marine Plastic)?
Benefits of Seaboard
Brands & Colours
Applications
Safety Information
Handling & Storage
Can’t find the exact size?
- Marine-Grade Durability: Resistant to saltwater, UV rays, and extreme weather conditions, ensuring long-lasting performance.
- Low Maintenance: Does not rot, splinter, or corrode, reducing the need for frequent repairs or replacements.
- Eco-Friendly: Made from recyclable HDPE , making it a sustainable choice for environmentally conscious projects.
- Easy to Fabricate: Can be cut, drilled, and shaped using standard woodworking tools.
- Slip-Resistant: Available in textured finishes for added safety in wet conditions.
- Simona Black & White
- SIGNAL GREY Nuvex Marine-Tec
- ANTI-SLIP / DIAMOND SURFACE
- Marine Structures: Ideal for docks, pilings, seawalls, and boat ramps due to its resistance to water and marine organisms.
- Outdoor Furniture: Perfect for benches, picnic tables, and decking in coastal or high-moisture areas.
- Boardwalks & Walkways: Provides a durable, slip-resistant surface for pedestrian traffic in wet environments.
- Industrial Applications: Used for tank supports, platforms, and other structures exposed to moisture or chemicals.
- Non-Hazardous: Seaboard is not classified as hazardous by OSHA standards. However, fumes may be released if heated, so proper ventilation and protective equipment are recommended during fabrication.
- Fire Resistance: Seaboard has a high flash point (>650°F) and is not easily flammable. In case of fire, use dry chemical, water fog, foam, or CO₂ extinguishers.
- Health Hazards: No known acute or chronic health risks. In case of exposure to molten material, treat as an ordinary burn and consult a physician.
- Store away from flames or heat sources.
- Use mechanical ventilation when cutting or heating to avoid inhalation of fumes.
- Dispose of waste material in accordance with local, state, and federal regulations.
- We will cut any size you need. Request a custom quote!
- Get a quick quote using our Online Pricing Calculator 🧮
Seaboard is a high-density polyethylene (HDPE) material specifically engineered for marine and outdoor environments. Known for its exceptional durability, resistance to water, UV stability, and low maintenance, Seaboard is a superior alternative to traditional wood. It is lightweight, easy to fabricate, and resistant to rot, insects, and corrosion, making it ideal for harsh conditions such as saltwater exposure and extreme weather.
As specialists in plastic, we also offer design and manufacturing solutions. LET'S TALK!
Ready to order your Seaboard HDPE (Marine Plastic)?
Cut to size, precision finished and dispatched Australia-wide. Not sure which material suits your job? We'll help you choose the right one.
Related Products
Technical Specifications
| Material Type | High Density Polyethylene (HDPE) |
| Surface Finish | Textured / Matte (both sides) |
| Density | ~0.95 g/cm³ |
| Tensile Strength | 26–33 MPa |
| Tensile Modulus | ~0.8–1.2 GPa |
| Flexural Strength | ~25–30 MPa |
| Impact Resistance | Excellent |
| Water Absorption | <0.01% |
| UV Resistance | Excellent (UV-stabilised) |
| Chemical Resistance | Excellent |
| Operating Temperature | -50°C to +80°C |
| Melting Point | ~130°C |
| Recyclability | 100% recyclable |
Certifications & Downloads
Frequently Asked Questions
What is Seaboard HDPE marine sheet used for?
What material is Seaboard marine board made from?
Is Seaboard HDPE suitable for marine and saltwater environments?
What sizes and thicknesses are available for Seaboard HDPE sheets?
Can Seaboard HDPE be cut, drilled, or machined?
How durable is Seaboard HDPE marine board?
Is Seaboard HDPE UV resistant and suitable for outdoor use?
Need this custom cut or fabricated?
Send us your drawing (DXF, DWG, PDF, EPS, STEP) and we'll quote your Seaboard HDPE (Marine Plastic) to spec.
What you can make with Seaboard HDPE (Marine Plastic)

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Guides & articles
Top 10 Ordering Mistakes With Plastic Materials (And How to Avoid Them)
Avoid common plastic ordering errors by selecting proper thickness, material type, and UV resistance; ensuring precise measurements; considering tolerances; and consulting suppliers for smooth, cost-effective projects.
Read guide →applicationsPlastic Wear Parts for Conveyor Belts: Materials, Applications, and Buying Guide
Conveyor Belts Conveyor belts fail for one simple reason: wear. Friction, abrasion, impact, moisture, and contamination slowly destroy metal components and belts, driving up downtime and maintenance costs. That is why plastic wearable parts on conveyor belts are now standard across food processing, packaging, mining, recycling, and manufacturing lines. This guide breaks down where plastic […]
Read guide →guidesThe Ultimate Guide to Choosing Cut-to-Size Plastic Sheets for Trade and DIY Projects
Guide to cut-to-size plastic sheets: choose the right material (acrylic for clarity, polycarbonate for strength), select proper thickness and finish for durability and look, and use precision cutting and custom fabrication for best results.
Read guide →materials7 Types of Plastic and Their Resin Identification Codes (RICs)
We’re surrounded by plastic-from food containers to clothing, it is very unmistakably a part of modern life. Not all plastics are created equal, though. Knowing the various kinds of plastic and their corresponding Resin Identification Codes (RICs) is fundamental to recycling and reuse, as well as in choosing products we consume. The resins used for […]
Read guide →fabricationTips for Cutting, Shaping, and Working with Plastic Materials
Plastic is a versatile material used for various projects, starting from simple crafts and up to the more complicated engineering designs. However, plastic can be very tricky if you do not know the proper ways of using it. Here are some tips in cutting, shaping, and working with plastic materials effectively: Choosing the Right Tools […]
Read guide →latest newsHistory of Australian Care
From the moment we wake up to the time we go to bed, we are surrounded by plastic products. It is hard to imagine a world without plastic, as it has become so ubiquitous. The convenience and versatility of plastic have made it a popular material in every industry. However, with every passing day, the […]
Read guide →Processing Services
Services available for this product
CNC Routing
Profiling, pocketing, and drilling in HDPE and UHMWPE sheet.
Learn moreCNC Lathe Machining
Turned HDPE and UHMWPE bushings, rollers, and fittings.
Learn morePlastic Welding
Hot-air and extrusion welding for HDPE tanks and fabrications.
Learn moreTank Fabrication
Custom HDPE tanks, bunds, and containment vessels.
Learn moreMachined Parts
Finished HDPE and UHMWPE components to specification.
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