Also known as cellular or expanded rubber, sponge rubber refers to a rubber base compound that has been processed with a foaming agent to create an air-filled matrix structure.
Unlike solid rubber, which is typically valued for its hardness (Shore A > 50) and used in static sealing applications between fixed components, sponge rubber is defined by its density (approximately Shore A 40). This makes it ideal for sealing between removable elements such as lids, doors, hatches, and panels—where flexibility and compressibility are essential.
Sponge rubber was first produced in 1929 using whipped latex and isocyanate-based compounds. Today, most foam materials are manufactured using polyurethane, and their core physical properties include lightweight performance, buoyancy, cushioning behavior, and thermal and acoustic insulation. A great example is microporous rubber, which offers low density and excellent sealing capacity, with high resistance to UV rays, ozone, and harsh weather conditions.
At Trustseal, we manufacture sponge rubber using high-quality synthetic elastomers combined with proprietary foaming agents. This results in a fully hermetic product that meets demanding sealing and gasketing requirements with consistency and reliability.
One of the key advantages of sponge rubber is its broad versatility. It can be used across countless industries and applications—including seals and gaskets for water, air, dust, oil, and grease. It is also ideal for acoustic and vibration insulation in mechanical systems and enclosures.
Another major benefit is that sponge rubber can be manufactured in a range of densities, making it adaptable to the specific performance needs of each application. This makes sponge rubber a versatile and unique material—engineered for performance, comfort, and durability.