Anti-Microbial Polyurethane Foam (Med/Soft) 4" x 20" x 21"

Item # 104463
Stock: 7

Item Description

Anti-Microbial Polyurethane Foam is the standard foam for outdoor cushions and boat seats. A common choice for OEM boat builders, this polyurethane foam is formulated with a biocide, antibacterial agent to prevent mold and mildew growth. It has a medium firmness and a density of 1.8 lb./cu. ft. Polyurethane foam does absorb water, therefore, when using this foam for exterior cushions, we recommend wrapping it in silk film (plastic) to protect it from moisture.

Anti-Microbial Polyurethane Foam is excellent for use as boat seats and outdoor cushions. This foam is recommended for only occasional indoor use. It is not appropriate for applications that receive continuous daily use, like living room sofas, which require a higher density (2+ lb./cu. ft) foam. Additionally, indoor applications do not require the antibacterial agent.

Use an electric kitchen knife to trim the foam if needed. To glue two pieces of foam together, we recommend using 3M Super 77 Spray Adhesive. Foam can be glued on the sides to make larger pieces or layered to make thicker cushions. If layering different stiffness foams, the firmer foam should be on the bottom.

Note: This item can not ship via Air.

At a Glance:

Foam Usage:Occasional
Foam Uses:MattressesPatio CushionsSaloon Cushions
Foam Firmness (IFD):Medium (35-45 lbs)

Special Features:

  • Biocide/Anti-Microbial


Thickness:4 inches
Width:20 inches
Length:21 inches
Density:1.8 pounds per cubic foot
Indentation Force Deflection* (IFD):35 (medium firmness)

*Indention Force Deflection is a measurement of the foam’s softness. IFD is the pressure, in pounds, needed to compress a 50 square inch circular plate 25% of the way into the foam.


Polyurethane Foams

Discussion of polyurethane foam both Anti-microbial & Reflex.

Cutting Foam with an Electric Kitchen Knife

See how easy it is to cut foam with a common electric kitchen knife.

Cushion Foam: Which Type Should I Use for My Boat or Home?

Full discussion about foam and the appropriate uses of each type of foam. Including Dry Fast or Open Cell Foam, Closed Cell Foam, Reflex Foam and more.

Ratings & Reviews

1 review

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Very comfortable!

by -

This is a great piece of foam!! I reupholstered my living room chair and wanted to replace the uncomfortable cushion that came with it. This one is way more comfortable! I have a hard time getting my butt out of the chair now. :/ This cushion is not too dense and not too soft. The one that came with the chair was very dense and hard. This one has just the right amount of "sink" for my taste.