G-10/FR4 Fiberglass Epoxy Laminate Sheet, Material Fiberglass Epoxy Laminate, Color Green, Clarity Opaque, Thickness 1/4 in, Overall Length 8 ft, Overall Width 4 ft, Tensile Strength 40,000 psi, Maximum Temperature 285 Degrees F, Minimum Temperature -58 Degrees F, Corrosion and Chemical Resistance Excellent, Hardness Rockwell M110, Thickness Tolerance +/-0.0220, Impact Strength 7 ft-lb/in, Standards MIL-I-24768/27 (GEF), Friction Rating Not Applicable, Grade G-10/FR4, Grouping Sheet Stock