AGY (Aiken, S.C., USA), a global producer of glass fiber yarns and high-strength glass fiber reinforcements, has announced the introduction of S-1 HM high-performance rovings for use in wind turbine blade applications. Using a proprietary new glass formulation, S-1 HM rovings reportedly are the highest tensile modulus glass fibers available worldwide, at 90 GPa, as measured by ASTM D2343. Data from AGY generated in unidirectional laminates (ASTM D3039, D3410) have shown that in the same resin system, S-1 HM rovings can provide benefits over traditional E-Glass, including an 85 percent increase in tensile strength, an increase in tensile modulus of more than 20 percent, a 50 percent increase in compressive strength and a 20 percent increase in compressive modulus. AGY also says it is also expected that S-1 HM rovings will demonstrate a ten-fold improvement in fatigue vs. E-Glass. S-1 HM rovings are available in a range of yields for epoxy and polyester resin systems. The direct roving product form is tailored for standard conversion to unidirectional fabrics and prepregs and multiaxial fabrics.