Using a proprietary new glass formulation, S-1 HM rovings are the highest tensile modulus glass fibers available worldwide, at 90 GPa, as measured by ASTM D2343. Typical E-Glass products offer tensile modulus of 70-75 GPa, while competitive higher performance glass fibers offer tensile modulus of 80-85 GPa. The new formulation was developed with feedback from various wind turbine OEMs who suggested the current need for high performance reinforcements is the highest possible tensile modulus while maintaining a balance with cost. The design also ensured that S-1 HM rovings can be produced at high volumes in a very cost effective manner, maximizing the value/performance offered to blade designers and manufacturers. S-1 HM rovings are available in a range of yields for both epoxy and polyester resin systems. The direct roving product form is tailored for standard conversion to unidirectional fabrics and prepregs and multiaxial fabrics.
