The U4291 polyurethane resin is a yellowish, two-component protective system designed to safeguard printed circuit boards in aggressive environments. Formulated for use with the U4291B catalyst at a 100:27 mix ratio by weight, the liquid components quickly increase in viscosity to form a thick, insulating layer. It provides a more flexible cure than epoxies, which reduces mechanical stress on delicate electronic components.
U4291 Polyurethane Resin Features:
Maintains a viscosity of 500 cSt and a specific gravity of 1.55.
Cures to a friable hardness, offering unique mechanical properties for specific PCB assemblies.
Functions reliably in continuous operating temperatures ranging from -50°C to +120°C.
Provides electrical safety with a dielectric strength of 14 kV/mm and meets UL94V0 (6mm) flammability standards.
Offers a 20-minute pot life alongside a 30-minute gel time.
U4291 Polyurethane Resin Applications:
Serves as an excellent insulator to protect electronic circuits from environmental stressors like moisture and vibrations.
Used for thick protection, allowing printed circuits to operate while immersed in liquids or gases.
Integrated into electronics manufacturing for the automotive, medical, military, aerospace (spatial), and home appliance industries.
About Prostech
Prostech offers specialty materials (adhesives, tapes, thermal interface materials, insulating materials, sealants, PCB protection materials, …) along with manufacturing solutions. We proudly serve a wide range of industries and are an authorized distributor for leading global manufacturers of industrial materials and equipment. Our product range is designed to deliver customized solutions that address each customer’s unique needs.
With years of experience and a successful project history, we are confident in our ability to provide comprehensive material solutions. These solutions effectively tackle the challenges manufacturers face. To explore our full product catalog, simply click here. Our dedicated team is ready to assist with:
Provide quotation, sample, TDS/MSDS, and technical consultation
Testing sample quality and verifying product compatibility in our laboratory
Customizing material formulas for special applications
Adapting product sizes, quantities, and packaging to meet specific needs
Offering expert advice on suitable equipment and automation processes
Delivering technical training and on-site support for optimal product use
Moreover, Prostech ensures the safe and accurate global delivery of all materials, including “dangerous goods”, in compliance with legal regulations. For personalized technical support or to receive a quotation, please contact us today.
