West System 73720 Biaxial Fiberglass Fabric 17 oz 50" x 20 Yards

The West System 73720 is a high-performance 17 oz. non-woven E-glass biaxial fabric designed for marine and composite reinforcement applications. This professional-grade fiberglass cloth features two layers oriented at ±45 degrees, held together with light stitching to create a stable, conformable fabric that drapes easily over complex curves and contours.

Key Features:

• 17 oz. per square yard E-glass construction for excellent strength-to-weight ratio
• ±45° biaxial fiber orientation provides superior shear strength and impact resistance
• Non-crimped flat fibers deliver reduced print-through and smoother finish compared to woven fabrics
• Higher stiffness-to-weight ratio than traditional woven cloth
• Light stitching holds layers together while maintaining flexibility and drape
• 50-inch width provides excellent coverage for large projects
• 20-yard roll length for extended work without seams

Applications:

• Structural repairs on boats, kayaks, and marine craft
• Tabbing and bonding hull-to-deck joints
• Reinforcing high-stress areas and attachment points
• Composite lay-ups requiring directional strength
• Strengthening panels, bulkheads, and structural components

The biaxial construction makes this fabric particularly effective for applications requiring torsional rigidity and resistance to twisting forces. The ±45° orientation aligns fibers to resist shear loads more effectively than 0°/90° fabrics, making it ideal for reinforcing areas subject to multi-directional stress. Compatible with epoxy, polyester, and vinylester resin systems.