What Are The Popular Attributes Of PU Foam?

What Are The Popular Attributes Of PU Foam?

What are the typical characteristics of polyurethane foam?- A common question when it comes to defining a good quality PU foam.

We’re here to help you calm down your curiosity in the most straightforward way possible. Continue reading to gain a thorough understanding of high-quality PU foam.

Rigidity of Polymer

People believe that thicker foam is stiffer and less dense foam is more flexible. However, it is not always true. Compare low-density rigid insulating foam to high-density carpet backing. The rigid polyurethane board is stiffer, but the carpeting backing is denser but not nearly as stiff.

The foam structure has to do with material rigidity. PU foam rises in the same way that a cake filled with air pockets does. You get open-cell foam by breaking the walls of those air bubbles before they solidify. Closed-cell foam is made by allowing the walls to harden (and then not crushing them). Closed-cell foams are rigid, whereas open-cell foams are flexible. Low and high-density foams with closed or open cells are available.

Density of Foam

Foam density is arguably the most commonly discussed attribute in the PU sector. When you place an order with Santech, you will receive a consultation call asking several questions about your requirements, including a question about foam density. This is because foam density is essential in both foaming and cutting processes, and failing to address it can harm both your product and your foam making machine.

Foam Making Machines
Foam Making Machines

The most popular material for mattresses and furniture is what we refer to as “low-density foam.” Consider soft, bendy foam in quilted textiles, shoulder pads, and other items. Carpet backing foam or complex crown molding for furniture and decor is commonly called “high-density foam”. Now there appears to be a high contrast between malleable carpet supporting foam and stiff molded furniture, as you may have noticed.

Bonding strength

Polyurethane foam is sticky during forming. This is why slabstock and box foaming require supporting paper. This is also why Santech offers a variety of laminating machines that allow you to save money by reducing the need for additional adhesives and instead relying on the PU’s natural adherence. PU adhesion is also used in foam insulation products.

Resistance to Erosion

Finally, there is abrasion-resistant foam to consider. Because they are self-skinning or generate an exterior “skin” of much higher densities than the interior, highly dense flexible foams are used in upholstery pieces, automobile trims, and shoe soles. This skin is not only surface rough, but it can also be designed to look like wood, imitation leather, and other materials. This feature of PU foam is significant in the footwear sector, as PU elastomeric footwear soles provide both flexibility and toughness for practical use.


Poor-density rigid foams, in particular, have a low thermal conductivity, which makes them excellent insulators. That is why rigid foam boards are layered between walls in architecture. Refrigeration uses rigid foam; good insulation reduces the amount of energy required to maintain the inside of a freezer cool, saving consumers money over time.

Now discover the essential features of polyurethane foam to broaden your business horizons. To ensure performance, several consumer markets demand certified foam. Santech Industries, the leading foam machine manufacturer offers a wide variety of foam machinery systems to cover all your commercial needs most affordably and smoothly. Get in touch today! 

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