As per our Shipping and Returns Policy, custom cuts and fabricated parts are non-returnable. If you need an over- or undersized item, note it under "Comments" during Checkout. Cut-to-size orders have an acceptable cut tolerance of 1/8" (0.125"), so clarify if the adjustment is to be made on the (+) or (-) side of the saw blade.Please review our full return and shipping policy here.
Measure Twice, Cut Once
Since custom cuts and fabricated parts are non-refundable, be very careful while measuring your dimensions. As each cut is nominal, even the slightest miscalculation could be costly.
How to Use a Measuring Tape
Extend your tape measure several inches to find the 1 and 2 inch markers. In between the inch markers you’ll find 16 equally spaced tick marks.
Measure by counting the increments beyond the nearest inch. As the increments decrease, so does the length of the mark. For example, 1/2" has a bigger mark than 1/4" which has a bigger mark than 1/8". The smallest mark follows at 1/16". Please be aware that some measuring tapes may have even smaller increments.
Features of a Measuring Tape: Sliding End Hook
The sliding end hook is designed for two different types of measurements. An outside measurement (where the hook of the tape hangs over an edge), requires the hook to slide out a bit to account for the thickness of the material. When making an inside measurement (where the hook will push up against a surface), the clip slides in, again, accounting for its thickness. The measuring tape self-adjusts to guarantee an accurate measurement (as far as the tape is concerned).
Sanitizing Acrylic and Polycarbonate Sheet [X]
Acrylic and Polycarbonate Sneeze Guards and like products require special care while cleaning and disinfecting. To maintain the optical clarity of sneeze guards and other acrylic or polycarbonate items, use an acrylic or polycarbonate safe cleaner like Novus Plastic Polish #1, Brillianize Plastic Cleaner, or a mild soap solution.
Please reference the following compatible cleaners when DISINFECTING acrylic and polycarbonate items. The use of commonly available commercial alcohol or ammonia-based disinfectants may cause crazing and damage.
UV-Stabilized & Moisture-Resistant HDPE for Marine Environments
Black HDPE Marine Board sheet is a lightweight, tough thermoplastic engineered to withstand harsh outdoor and marine conditions. Formulated with environmental stabilizers, this material offers a dependable solution for applications regularly exposed to moisture, salt water, and sunlight.
Black Marine Board provides an alternative to traditional marine materials like wood or metal that can reduce required maintenance. It does not splinter, delaminate, or rot, and will not require painting or refinishing. Its stabilized HDPE formulation makes it an efficient choice for both commercial and recreational marine builds.
Marine Board HDPE combines the excellent durability of HDPE with a UV-stabilized formulation for use in marine applications. Choose this material if your project needs:
Salt Water & Moisture Resistance:
Very low moisture absorption helps the material resist swelling, degradation, and mildew in humid, wet, or splash-prone environments.
UV-Stabilized Longevity:
Environmentally stabilized to resist the degrading effects of outdoor UV exposure.
Decorative Textured Finish:
Features a decorative, textured surface that helps make everyday scuffs, dirt, and handling marks less noticeable.
Chemical Resistance & Cleanability:
Highly resistant to a wide range of chemicals, acids, and alcohols, making it exceptionally easy to clean and maintain.
Cost-Effective Utility:
Provides a practical material option for non-structural marine cabinetry, hatches, trim, storage, and outdoor fabrications.
Marine Board vs. King StarBoard®: Which Do You Need?
While both materials use a polyethylene base optimized for outdoor exposure, they are best suited to different operational demands:
Choose HDPE Marine Board (This Sheet) when you need an economical, UV-stabilized HDPE sheet for general marine cabinetry, hatches, trim, storage components, and other non-structural fabrications.
Choose King StarBoard® if your application calls for a premium, widely recognized marine-grade HDPE brand, specific color matching, or specialized variants such as anti-skid textures (StarBoard® A/S) or lightweight cellular cores (StarBoard® XL).
Fabrication & Machining
Black HDPE Marine Board is machinable using standard woodworking equipment - it can be cut, routed, and drilled with ease. Note: HDPE has low surface energy and is difficult to reliably bond with standard adhesives. Mechanical fastening or plastic welding is generally preferred; allow for thermal expansion when designing fastened joints.
WARNING: This product can expose you to chemicals including Bisphenol A, CAS 80-05-7, which are known to the State of California to cause birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
Handling: Cut sheets may have sharp edges. We recommend wearing protective gloves when unpacking and handling this material to ensure safety.
Suitability: We take pride in the quality of our materials as they leave our facility. However, because every project is unique, we cannot account for how materials are modified, stored, or used after delivery. Please perform the necessary tests to ensure this material is right for your specific application and end-use conditions.
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Technical Performance
This UV-stabilized, black-pigmented HDPE is specifically engineered for outdoor and marine applications requiring a combination of low moisture absorption, chemical resistance, and durable impact strength.
Moisture Resistance:
Provides very low water absorption, minimizing the risks of swelling, rotting, or delamination common in marine environments.
Outdoor Stability:
A UV-stabilized formulation helps slow color and property degradation during outdoor exposure.
Impact Resistance:
Provides the toughness needed for hatches, cabinetry, trim, storage components, and other non-structural marine fabrications.
Key Properties
Easy to Machine:
Can be quickly and precisely fabricated using standard, common woodworking tools and shop machinery.
Chemical Resistance:
Resistant to many acids, bases, alcohols, and common marine cleaning agents.
Low Maintenance:
The solid black color extends through the entire sheet and requires no sealing, painting, or regular aesthetic refinishing.
Heat Formability:
Can be heat-formed into bends or gradual curves using controlled heating and suitable fixturing.
Countertops & Work Surfaces: Marine galley surfaces, outdoor counters, bait-preparation stations, and washdown-area components.
Outdoor Fabrication: Furniture components, equipment panels, signs, and non-structural fixtures exposed to moisture and sunlight.
Engineering Limitations & Alternatives
While Black HDPE Marine Board is designed with moisture and weather resistance in mind, specific applications may require alternative engineering materials:
Solar Heat Buildup: Black surfaces can become hot in direct sunlight, increasing thermal expansion and surface temperature. Better Alternative: For exposed surfaces where reduced solar heat absorption is important, consider White HDPE Marine Board.
Tight Machining Tolerances: Due to a relatively high coefficient of thermal expansion, HDPE expands and contracts significantly with temperature swings, making it difficult to maintain extremely tight tolerances. Better Alternative: For precision-machined industrial parts requiring strict dimensional stability, consider Acetal.
Dedicated Anti-Skid Surfaces: The standard textured finish provides basic scuff resistance but is not certified as a dedicated non-skid walking surface for high-angle marine decks. Better Alternative: For marine steps, walkways, and other safety-focused walking surfaces, consider premium King StarBoard® A/S.
WARNING: This product can expose you to chemicals including Bisphenol A, CAS 80-05-7, which are known to the State of California to cause birth defects or other reproductive harm. For more information go to