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Polyurethane foam is a product of the petroleum industry and is the most common foam used in couch cushions. Available in multitudes of grades which can indicate the expected number of years of wear and various stages of firmness and in a wide price range, it can be found in retail stores or purchased through specialty foam distributors, upholsterers and some drapery construction workrooms. Because it is a product of the petroleum industry, it may not be considered an eco-friendly product because it is made from a non-renewable resource.
Types of Foam Cushion
Polyester Fiberfil
Polyester Fiberfil is not truly foam, but rather blown polyester fibres. An affordable option, it is a common stuffing for pillows and deep seating back cushions. Generally, Polyester Fiberfil is stuffed inside a pre-sewn cover of Spun Bonded Pillow Protector Fabric, which is then inserted into the cushion or pillow fabric to give support and shape. Fiberfil is no allergenic and resistant to mildew. It is machine washable, but the fibre can bunch up in laundering. Use your hand to smooth it back out.
Medium Density Polyurethane Antimicrobial Foam
Medium Density Polyurethane Antimicrobial Foam is a traditional foam option with medium firmness that is suitable for seating and mattress applications. Polyurethane foam soaks up water when it gets wet, but the antimicrobial treatment on the foam helps to prevent the growth of mould and mildew as the foam dries out. Antimicrobial foam should be used where it is unlikely to get wet or it should be wrapped in a waterproofing layer, like Cushion Wrap Silk Film, before being inserted in the cushion cover.
High Density Polyurethane Foam
This polyurethane foam is the same basic product as the Medium Density Polyurethane Antimicrobial Foam, but with a higher density. The higher density makes this foam more resilient, and therefore more suitable for everyday, high-traffic uses. High Density Polyurethane Foam is available in medium, firm and extra-firm firmness levels and typically lasts up to 12 years. Some high density foams are antimicrobial as well. This foam is best for upholstery seating, high-use interior applications, such as sofa cushions, and for interior settee and berth cushions in dry boats.
Dry Fast Open Cell Foam
Open cell foam has open pores that allow water and air to flow through easily. Open cell foams make a comfortable and cool seating cushion or mattress. Dry Fast is high-quality open cell foam. Dry Fast Foam is formulated with an antimicrobial agent to prevent mould and mildew. When paired with an outdoor cushion fabric or Phifertex Mesh, open cell foam creates a virtually maintenance free cushion in sun, rain and snow. These traits also make this foam great for boat cockpit cushions
Closed Cell Foam
Closed Cell Foam resists moisture absorption, making it buoyant. This foam is made from PVN and is three times firmer than polyurethane foam. It is also a more expensive option. Closed Cell Foam is great for flotation applications like floating cockpit cushions and life vests. It is also a good choice for commercial boat seating, or other seating that will be used as a step for getting on and off the vessel. This foam has no water absorption, so you can safely cover it with any type of fabric.