Medium Density Polyurethane Antimicrobial Foam (Medium) 3" x 36" x 80"
SKU: 183M3680
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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: 3"
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, Patio Cushions, Pontoon Seats, Powerboat Seats, Salon Cushions
Foam Firmness: Medium



A. 3"
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 : 4.25 8 Reviews

0 Reviews
0 Reviews
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Jean Gatz
Verified Purchase

thank you

LInda Harmon
Verified Purchase

Perfect for my project, an oversized lounger that needed cushions! Very comfortable yet firm. Highly recommend.

William Chapman
Verified Purchase

Worked great thanks

Verified Purchase

Exactly as expected and arrived very quickly

Colin Weaver
Verified Purchase

good stuff would buy again

Verified Purchase

Foam cushion came on time and as advertised. Worked perfectly for my front boat cushion.

A Seamstress
Verified Purchase

The customer I purchased this foam for decided it was too costly and changed their mind on the cushions ordered from me. You have a no return policy on foam, so I am stuck with it, unopened package, and nothing to do with it.

chaney hicks
Verified Purchase

Still don’t have item ordered.

Maybe don’t ask me to review something I haven’t received yet!

Sailrite Response

This medium density foam is backordered with new stock due on 5/20. We appreciate your patience as we work with our vendor to obtain new stock as quickly as possible.

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