Expandable Polystyrene (EPS)

Expandable Polystyrene foam (EPS) is a lightweight rigid product made from raw material with many uses. The pre expansion phase involves heating and applying pressure to small polystyrene beads, allowing them to swell significantly in size. It is made in various grades with density ranges from 0.7 lb./ cu ft to 3 lb./ cu ft. The product is composed of small round beads that have been expanded by steam heat using blowing agents and a foaming agent. The expanded beads are poured into a mold, and more steam welds the beads into a finished rigid block of EPS foam ready for fabrication. High pressure is applied during the molding process to achieve the desired density and consistency.

EPS is widely used for packaging dunnage, floatation, and insulation. We offer a full line of Geofoam EPS foams for building construction and architectural applications. Various grades of EPS are called out specifying the nominal density and the load bearing capacity usually in PSI (lb./in2). EPS foams have compression resistance values ranging from 5 PSI to 60 PSI.

EPS foams are easily fabricated into shaped for protective packaging. Dunnage applications include crating, pipe welding, blocks, boat hull supports and lightweight pallet manufacturing. Concrete forming and void filling blocks, crown molding, and architectural columns as well as stage props are all products where EPS is the material of choice, since it is lightweight, has a low cost and is moisture proof.

Properties and Benefits

EPS boasts several key properties that make it a popular choice across multiple industries. Its closed-cell structure provides superior thermal insulation, making it ideal for use in building construction, refrigeration, and packaging. The material’s very little weight makes it easy to transport and handle, reducing transportation costs and logistical challenges. Additionally, EPS has a high R-value, indicating its excellent ability to resist heat flow, which enhances its effectiveness as an insulation material. The material’s resistance to moisture, chemicals, and pests further contributes to its durability and long-lasting performance, ensuring that it remains a reliable choice for various applications.

Applications and Uses

The unique properties of EPS make it suitable for a wide range of applications. In building construction, EPS is commonly used as a thermal insulation material, helping to reduce energy consumption and lower fuel emissions. Its high compressive strength and shock-absorbing capabilities make it an excellent choice for protective packaging, ensuring the safe transportation of fragile goods. EPS is also widely used in refrigeration and cold storage, where its thermal insulation properties help maintain optimal temperatures. Additionally, EPS is utilized in the manufacture of foam cups, plates, and other disposable products, highlighting its versatility and practicality.

Sustainability and Environmental Impact

EPS is recognized for its sustainability and minimal environmental impact. The production process involves the use of a blowing agent, typically pentane, which has a low environmental impact. EPS is also recyclable, and many manufacturers offer recycling programs to manage EPS waste effectively. The material can be reused and repurposed, reducing the need for new raw materials and minimizing waste. In building construction and refrigeration, the use of EPS leads to significant energy savings, which in turn reduces fuel emissions and greenhouse gas emissions. Overall, EPS offers a range of benefits while maintaining a low environmental footprint, making it a responsible choice for various applications.

Sterling has been fabricating EPS solutions for decades. You can count on our years of experience to provide the right answer to get the job done.