Medium Density Polyurethane Antimicrobial Foam (Medium) 4" x 36" x 80"
SKU: 184M3680
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Medium Density Polyurethane Antimicrobial Foam, formerly known as Reflex Biocide Foam, is the standard foam choice for the marine industry. Sailrite is proud to offer this popular foam with antimicrobial properties to prevent the growth of mold and mildew. This foam has a medium stiffness, a density of 1.8 pounds per cubic foot and a foam IFD (Indentation Force Deflection) of 45 pounds.

Medium Density Polyurethane Antimicrobial Foam is an excellent choice for marine upholstery and partially protected outdoor cushions as its antimicrobial properties mean it can stand up to moisture and remain mold and mildew free. It is recommended for occasional indoor use and is not appropriate for frequent, everyday use and high-traffic environments. For a heavy-use foam, consider High Density Polyurethane Foam from Sailrite. Medium Density foam can be wrapped in silk film to help keep moisture out, which is especially important when used in wet environments.

The Sailrite® Blade Foam Saw expertly cuts through a full range of foam types. A standard electric kitchen knife can also be used, though the results won’t look as professional. To glue two pieces of foam together, Sailrite recommends using spray adhesive. Foam can also be glued on the sides to make a wider piece or layered to make thicker cushions. If layering foams with different stiffness levels, the firmer foam should be the bottom layer.

Please Note: Sheet size can vary up to 2 inches in length and 1 inch in width.

Important: Items are compressed for shipping, we recommend unrolling as soon as possible. Compressed foam takes up to a week to regain its original size and shape. Allow foam to fully decompress before cutting or using in a project.


Sale Unit: EA
Length: 80"
Width: 36"
Thickness: 4"
Certifications: California Flammability Regulation (Bulletin 117, Section E)
Foam Density: 1.8 pounds per cubic foot
Foam IFD: 45 pounds
Special Features: Antimicrobial/Biocide
Foam Material: Polyurethane
Foam Firmness is a measurement of the foam’s softness. Indention Force Deflection, or IFD, is the pressure in pounds needed to compress a 50 square inch circular plate 25% of the way into the foam.

At a Glance

Foam Usage: Occasional
Foam Uses: Helm Seats, Mattresses, Patio Cushions, Pontoon Seats, Powerboat Seats, Salon Cushions
Foam Firmness: Medium



A. 4"
B. 36"
C. 80"


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Types of Foam for Cushions & Upholstery

In this helpful video, we will walk you through all the different types of foam Sailrite has to offer. Understanding the properties and uses of different foam types will help you know which one is right for your DIY project. The four types of foam we will cover are high density, medium density, open cell (Dry Fast) and a closed cell foam. After watching this video, you will be able to select the correct foam for your cushion or upholstery application.

Gluing Foam With Foam Lock Spray Adhesive

We test the holding strength of adhesive spray and see how it holds up when used on different foam types. This spray offers quick tack and high coverage while providing a very strong bond.

Cutting Foam With the Sailrite® Blade Foam Saw

This high-quality foam cutter is a great tool for both serious DIYers and small upholstery shops. It delivers smooth, clean cuts through many types of foam for professional-looking results every time.

Cutting Foam With an Electric Kitchen Knife

This video shows you how to use a standard electric kitchen knife to trim your foam to size, including some tricks to achieving a sharp cut line and using weights to keep the foam in place while cutting.


Overall Rating : 4.71 7 Reviews

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Chase Goldfeld
Verified Purchase

Great Company

This is second time I’ve ordered from Sailrite, I’ve been very happy with their products

Shanna Letner
Verified Purchase


Sailrite was the only company I could find that had antimicrobial foam

Adrienne Engell
Verified Purchase

Great for outdoor furniture use

This is a great quality cushion. I bought it to use for a hanging day bed that I built, which is outdoors and exposed to wind and rain. I wanted something waterproof that would not become saturated or develop mold or bacterial growth. A marine grade cushion was the perfect solution. I made a cover for it out of a waterproof outdoor canvas material.

Verified Purchase

Lives up to the quality described!

First time buyer replacing twin berth mattress. Received good pre-purchase assistance to help select the product online. Prompt delivery. Measurements exact. Density excellent and would rate the product more toward medium-firm density which is what I was hoping for. All around good experience and will definitely use Sailrite again.

Clayton Craig
Verified Purchase

Thank you !! Fast delivery, great communication. I appreciate it.

Verified Purchase

Great product even though I didn’t use it.

This is high quality foam. It was actually not quite right for the application I needed it for - I should have purchased a thinner foam. However it is really a good product. I understand why they won’t allow returns on foam so I’ll find some other use. I will do business with sail right again. I recommend them to anyone interested in high quality products.

Del Carey
Verified Purchase

Good stuff

Material is as advertised

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