High Density Polyurethane Antimicrobial Foam (Firm) 4" x 24" x 80"
SKU: 284F2480
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High Density Polyurethane Antimicrobial Foam is the best choice when you need a high-quality, long-lasting and dependable foam ideal for heavy-use applications. Its density means it will provide excellent support while still delivering on comfort, making it ideal for high-traffic seating cushions (such as couches and sofas), benches, cabin seating and sleeping berths, automotive seating and certain outdoor cushions. Its antimicrobial properties help prevent the growth of mold and mildew.

For outdoor use, Antimicrobial High Density foam can be used, and silk film should be wrapped around the foam to help keep moisture out. Also use an upholstery fabric that has high water resistance or can be treated with a waterproofing solution.

High Density Polyurethane Antimicrobial Foam will typically last up to 12 years. It has a firm stiffness, a density of 2.8 pounds per cubic foot and a foam IFD (Indentation Force Deflection) of 60 pounds.

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 may 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: 24"
Thickness: 4"
Foam Density: 2.8 pounds per cubic foot
Foam IFD: 60 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: Frequent
Foam Uses: Automotive Seating, Home Decor Cushions, Mattresses, Patio Cushions, Pontoon Seats, Powerboat Seats, Salon Cushions
Foam Firmness: Firm



A. 4"
B. 24"
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 : 4.6 15 Reviews

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Pam Addleton
Verified Purchase

For elderly ease

Perfect thickness to raise chair & sofa cushions for my elderly father. Such a remarkable difference for his level of strength to stand from a sitting position!

Verified Purchase

Good Qualtity, Heavy Foam

The foam is very firm and appears to be a very good quality. It is very heavy. Cuts easily with a long bread knife. I found a video on YouTube showing how to take long strokes with the knife. Keep the blade straight up and down. Arrived quickly. I would buy from this company again.

Annette Kenny
Verified Purchase

The best foam cushion around

I am thrilled with the quality of the foam. I have made cushions for my banquette seating. When someone sits down, every time, they will ask me where I got the foam! Thank you!

Enita Berkheiser
Verified Purchase

Great foam, terrific price and prompt delivery.

Linda Correa
Verified Purchase

Making cushions for my patio furniture and highly recommend this foam. Have used it on several outdoor creations and it’s the only way to go. Dries out quickly, resists mold and mildew and is great at keeping its shape.

Karen Williams
Verified Purchase

Everything came in on time and great condition,

Elizabeth Gillespie
Verified Purchase

High quality foam and fast shipping!

Anthony Caswell
Verified Purchase

exactly as described and shown

Jill Tartaglino
Verified Purchase

This is going to really help my sofa cushions look like new. Nice and thick and firm.

sherrie spencer
Verified Purchase

Very firm! I’m happy with it, but might have settled for medium.

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