Polyethylene foam inserts are a popular choice for protecting firearms and valuables during transport. This guide highlights top polyethylene foam sheets and blocks designed for gun cases, tool drawers, and DIY projects. Each option emphasizes closed-cell construction to resist moisture, lightweight handling, and ease of customization. Below, you’ll find five well-regarded products that balance durability, customization ease, and price, helping you tailor a secure, professional-looking packing solution.
Summary Table Of Selected Products
| Product | Brand | Size (L x W x D) | Notable Feature |
|---|---|---|---|
| Polyethylene Foam Sheet | Ramede | 54 x 16 x 2 in | Closed-cell, easy to cut, moisture resistant |
| Polyethylene Foam Sheet | Ramede | 54 x 16 x 1 in | Closed-cell, moisture resistant, versatile |
| Customizable Foam | Case Club | 36 x 16 in, 1.625 in thick | Military grade, easy customization |
| Customizable Foam | Case Club | 36 x 16 in, 3.0 in thick | Heavy-duty, robust protection |
| Customizable Foam | Case Club | 54 x 16 x 2 in | Military grade, versatile for cases |
Ramede 54x16x2 In. Black Polyethylene Foam Sheet

This Ramede polyethylene foam sheet is designed for multiple applications, including gun packing cases, crafts, and tool storage. The sheet measures 54 x 16 x 2 inches, with a density around 20 kg/m³. It is closed-cell foam, meaning it resists moisture and oils, helping prevent rust on firearms. The foam can be cut to fit custom shapes using common tools like a razor blade or hot wire (tools not included). This makes it a practical option for creating snug, tailored compartments in cases or DIY projects where moisture resistance matters.
Key points: closed-cell construction; moisture and oil resistance; easy to customize; suitable for pistols and rifles; broad application scope beyond firearms.
Ramede 54x16x1 In. Black Polyethylene Foam Sheet

This Ramede sheet provides a slightly thinner option at 54 x 16 x 1 inches, still offering the same closed-cell construction to deter moisture and oil contamination. It is designed for flexible use in packaging, storage, or crafting. With easy-to-cut properties, you can shape this sheet to customize the interior of gun cases or organization trays, ensuring a secure, custom fit for various firearms and equipment. It’s a practical choice for DIY organizers and protective inserts alike.
Key points: identical closed-cell benefits; versatile for multiple applications; suitable for thinner cushion needs; simple cutting options.
Case Club 36×16 Customizable Military Grade Foam 1.625″ Thickness

Case Club offers a customizable, military-grade closed-cell polyethylene foam sheet sized 36″ x 16″ with a thickness of 1.625 inches. The foam is designed to be easily cut with common tools, enabling precise layouts for pistols, rifles, or valuables in various case brands. It’s pitched as an upgrade from degraded polyurethane or for refreshing existing setups. Its versatility makes it suitable for rifle cases, tool drawers, electronics, and other protective setups. The foam’s durability and compatibility with standard case brands add to its appeal for many users.
Key points: military-grade closed-cell foam; straightforward customization; fits major case brands; durable and versatile for multiple uses.
Case Club 36×16 Customizable Military Grade Foam 3.0″ Thickness

This Case Club option provides a heavier-duty 3.0-inch thick polyethylene foam, ideal for extra protection in rugged transport scenarios or for storing heavier gear in the same frame. The foam remains closed-cell, ensuring moisture and oil resistance. The product emphasizes ease of cutting with standard tools and outlines how to map out parts before cutting. It’s well-suited for heavy equipment accommodations or for creating deep, protective compartments within larger cases or drawers.
Key points: thicker, more protective; still customizable; moisture resistance maintained; great for heavy or bulky gear.
Case Club Military Grade Closed Cell Foam, 54x16x1.625

This Case Club option is a 54″ x 16″ x 1.625″ closed-cell polyethylene foam sheet, designed for protecting pistols, rifles, or other valuables. It highlights its compatibility with a range of case brands and emphasizes ease of customization with common cutting tools. The closed-cell composition minimizes moisture and oil absorption, reducing corrosion risk and facilitating a clean wipe-down after use. It’s positioned as a reliable upgrade or replacement insert for established gun cases or storage drawers.
Key points: compatible with major case brands; simple customization; moisture and oil resistance; durable for years of use.
Case Club 54x16x2 Customizable Polyethylene Foam

This Case Club sheet measures 54″ x 16″ x 2″ and is described as military-grade polyethylene foam. The closed-cell construction keeps out moisture and gun oils, preserving both the foam and stored items. It is designed for easy cutting with razor blades or carving knives, with a suggestion to outline parts before cutting to ensure a precise fit. The sheet is suitable for replacing worn inserts in Pelican, SKB, Plano, and Flambeau cases or for building custom storage solutions in DIY projects and professional setups alike.
Key points: robust 2″ thickness; excellent for case upgrades; supports precise layouts; moisture and oil resistant.
Buying Guide: Key Purchase Considerations For Polyethylene Foam
- Moisture and chemical resistance: Closed-cell polyethylene foam resists moisture, oils, and solvents, making it ideal for firearms and other sensitive gear. Look for closed-cell specifications and density details to gauge durability.
- Density and rigidity: Higher-density foam offers better protection against impact and compression. Balance density with the required thickness to achieve a snug fit without adding excessive weight.
- Thickness and fit: Thicker foams (2–3 inches) provide more cushioning for heavy equipment, while thinner sheets (0.5–1 inch) suit light gear or layered inserts. Consider the dimensions of your case and the items to be stored.
- Cutting ease and tools: Most two-sided foam sheets can be cut with common tools (razor, electric carving knife, hot wire). Plan layouts by outlining components before cutting to avoid waste.
- Compatibility with cases: Some foams are marketed as “customizable” for popular case brands (Pelican, SKB, Plano, Flambeau). Ensure your chosen foam fits your existing case or drawer dimensions.
- Applications beyond firearms: These foams work for tool organizers, electronics, and hobby projects. If you need a versatile organizer, choose a sheet with uniform density and clean edges after cutting.
- Maintenance: Closed-cell foam is easy to wipe clean and resists moisture. Enthusiasts often prefer foams that resist rust and dust buildup to simplify upkeep.
Overall, selecting the right polyethylene foam depends on your storage needs, case compatibility, and the level of protection required. For gun storage and transport, options with 1.5 to 2.0 inches of thickness typically provide a balance of protection and customization flexibility, while heavier-duty 3.0-inch foams are ideal for bulky setups or rugged conditions. Always outline your parts first and test-fit before finalizing the cuts.