Layered nonwoven biaxial and triaxial gives 27,000 psi which is about 20% improvement of normal E glass. Biaxial and triaxial glass offers greater ease of fabric orientation and saves time over multilayered wet layups. BI-X12 weights 12 ounces per square yard and is 14 mils thick. BI-X18 weighs 18 ounces per square yard and is 18 mils thick. TRI-X22 weighs 22 ounces per square yard and is 22 mils thick. All are 50 inches wide. FAA certified with tracer thread: