E-glass and S-glass prepregs in epoxy and phenolic resin systems, plain and satin weave constructions.

E-Glass vs S-Glass Laminate Properties

Property E-Glass Prepreg S-Glass Prepreg Test Standard
Tensile Strength 430 MPa 650 MPa ASTM D 3039
Tensile Modulus 24 GPa 30 GPa ASTM D 3039
Flexural Strength 445 MPa 750 MPa ASTM D 7264
Flexural Modulus 25 GPa 30 GPa ASTM D 7264
Compressive Strength 323 MPa — ASTM D 6641
Interlaminar Shear 58 MPa 70 MPa ASTM D 2344
Resin Content 33-37% 35-40% —
Weave Options Plain / Twill Plain / Twill —

Data from CA Composites product testing. S-glass offers ~50% higher tensile and flexural strength, ideal for high-performance structural applications.