Free Shipping for orders over $500 + GST.  (Brisbane, Sydney, Melbourne Postcodes)
Seaboard HDPE (Marine Plastic)

Seaboard HDPE (Marine Plastic)

4.8 · Perspex Online store rating (45 reviews)

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…

$240.00 + GST
inc. GST $264.00
Waterproof Plastic
Waterproof Plastic
Marine Grade
UV Resistant
UV Resistant
Perfect For Boats
1 Configuration
2 Service add-ons

Optional finishing services - toggle any you need.

Drill holes

Optional. Add drilled holes to your piece.

Flame polished edges

Acrylic only - optical-grade edge finish

Rounded corners

Manual router - per-corner price scales with thickness

Edge profile

Rounded or 45 degree bevel - per-metre rate x thickness

$0.00 + GST
Pay G Pay
Price breakdown
- -
-
Quantity -
Shipping estimate above
Fast Shipping 2-4 business days
Precision Cut +/-0.5mm tolerance
Quality Assured Industry-leading

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.

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

Frequently Asked Questions

What is Seaboard HDPE marine sheet used for?
Seaboard HDPE marine sheet is a high-density polyethylene panel commonly used in marine and outdoor applications. Typical uses include boat components, seat bases, hatches, bait boards, cabinetry, pontoons, and dock fittings. It is chosen for wet environments because it does not rot, swell, delaminate, or absorb water like timber or plywood.
What material is Seaboard marine board made from?
Seaboard marine board is manufactured from high-density polyethylene (HDPE). HDPE is a solid thermoplastic known for high impact strength, chemical resistance, and moisture resistance. It is UV-stabilised for outdoor exposure and supplied as a solid colour sheet with consistent properties throughout, making it suitable for machining, cutting, and fabrication.
Is Seaboard HDPE suitable for marine and saltwater environments?
Yes. Seaboard HDPE is widely used in marine and saltwater environments because it is non-porous and corrosion-resistant. It will not absorb water, rust, or degrade when exposed to salt spray, fuel, oils, or cleaning chemicals. This makes it suitable for long-term use on boats, jetties, and coastal installations.
What sizes and thicknesses are available for Seaboard HDPE sheets?
Seaboard HDPE sheets are typically available in standard sheet sizes and a range of thicknesses to suit different applications. Common thicknesses range from thin panels for linings to thicker boards for structural components. Availability depends on the supplier and brand, with cut-to-size options often offered for specific project requirements.
Can Seaboard HDPE be cut, drilled, or machined?
Yes. Seaboard HDPE can be cut, drilled, routed, and machined using standard woodworking or plastic fabrication tools. It machines cleanly without splintering and does not require sealing after cutting. Allowance should be made for thermal expansion when fixing or installing, particularly in outdoor or marine environments.
How durable is Seaboard HDPE marine board?
Seaboard HDPE is highly durable and designed for long-term outdoor and marine use. It resists impact, moisture, UV exposure, and most chemicals. Unlike timber, it does not rot, crack, or delaminate. Performance over time depends on installation conditions, thickness selection, and exposure to extreme temperatures or mechanical loads.
Is Seaboard HDPE UV resistant and suitable for outdoor use?
Yes. Seaboard HDPE marine sheet is UV-stabilised and designed for continuous outdoor exposure. It maintains its structural properties when exposed to sunlight, rain, and temperature changes. Colour fading may occur gradually over time, depending on exposure conditions, but this does not affect the material’s functional performance.

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.

Max 5 files, 10MB each

From the blog

Guides & articles

guides

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 →
applications

Plastic 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 →
guides

The 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 →
materials

7 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 →
fabrication

Tips 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 news

History 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 →