By David Reed, UT EditorWilton, Connecticut-GE Advanced Materials-Silicones has added two members to its family of silylated polyurethane resins for use in adhesive, sealant, and coating applications.Designated SPUR Y-15735 LM and SPUR+ 1050 MM, they are low-viscosity prepolymers which cure rapidly to give, respectively, low- and medium-modulus polymers, GE says. These SPUR prepolymers offer exceptional adhesion to a wide range of porous and non-porous substrates: metals, glass, ceramics, and plastics-even wet, primer-less concrete, the company claimed, in a prepared statement.SPUR Y-15735 LM is three times as fast in tack-free time, and enhances deep-section cure under ambient conditions by about 50 percent compared to similar resins with earlier silane end-capping technologies, GE says.SPUR prepolymers have no residual isocyanates, avoiding the problem of isocyanates' reactivity with many additives, such as UV inhibitors and antioxidants, which typically deactivate the additive or the isocyanate itself, GE points out."Our innovative, versatile SPUR prepolymers are designed to help formulators grow their business," said Bruce Waldman, GE global marketing manager, SPUR prepolymers. "They allow adhesion to a broad variety of substrates, avoiding the cost of developing specialised sealants or adhesives for different types of materials. The clear, non-yellowing resin is also durable, weatherable, and immediately paintable. "When high performance is paramount, our SPUR materials deliver - whether it's keeping the weather out of your house, securely attaching skyscraper windows, or holding your car's windshield in place," Waldman added.In conjunction with Adhesives & Sealants Industry magazine, GE Advanced Materials-Silicones is offering a free web seminar-New SPUR prepolymer and new Silquest adhesion promoters for concrete-on 18 Oct. at 11:00am EDT. Visit www.adhesivesmag.com/events to participate."