SABIC has announced the launch of the Ultem SU3102P reactive oligomer, intended as a toughening agent for thermoset composites used in aerospace. The company points to applications in both primary and secondary structures, including wings, fuselage frames, spoilers and interior components. According to Sabic, the new polyetherimide (PEI) oligomer is designed to provide substantial freedom in thermoset formulation design without compromising processability. The company also reports that the product received a Gold award in the 2026 Edison Awards.
Commenting on market conditions, SABIC referred to increasing air traffic and pressure to expand throughput while meeting cost, safety and sustainability targets. Sergi Monros, vice president, SABIC Polymers, Specialties BU, said: "As global air traffic increases significantly with more passengers and cargo, the industry faces pressure to build capacity and throughput within its existing footprint, while still meeting cost, safety and sustainability goals. Our new Ultem oligomer can help designers create lighter, thinner and tougher composite structures, increase manufacturing efficiency and cut emissions. This addition to our Ultem portfolio builds on a long history of success in aerospace applications and demonstrates our strong commitment to materials innovation."
Loading level and comparison with rPES
SABIC states that Ultem SU3102P is the only thermoplastic solution capable of reaching loadings of up to 50 wt%. By comparison, according to the company, reactive polyethersulfone (rPES) typically allows only 7–12 wt%. The manufacturer also claims an improvement in the toughness-stiffness balance of up to 140% versus rPES, which is intended to help composites resist fracture and other impact-related damage. As a result, higher part durability could, according to Sabic, reduce maintenance time and costs and increase operational safety.
Formulation viscosity and processing impact
Despite the potential for high loadings, the oligomer is said to maintain low formulation viscosity, supporting stable and efficient processing and helping to reduce cycle time. SABIC indicates that the material can enable composite manufacturers to increase the productivity and energy efficiency of thermoset composite prepregs by up to 30%. The company also emphasizes drop-in use in existing manufacturing processes and compatibility with a wide range of thermoset resin systems.
Material properties and availability
According to the company, Ultem SU3102P offers characteristics typical of the Ultem family, including strength, inherent flame retardance, high heat and chemical resistance, and a low coefficient of thermal expansion (CTE). SABIC reports that the material is available globally for sampling as well as in commercial quantities.
