Fiberglass Chopped Strand Mat, 4" x 5 Yards (1.5 oz/ft²)

The Momotata Fiberglass Chopped Strand Mat (1.5 oz/ft², 4 Inches x 5 Yards) provides professional-grade reinforcement for marine, automotive, roofing, and general molding applications. Made from high-quality E-Glass, this CSM features randomly oriented chopped strands that deliver isotropic strength – equal reinforcement in all directions. The lightweight 1.5 oz weight is ideal for multi-layer laminates where you want reliable strength without excessive thickness. Key benefits of this fiberglass mat include excellent drape and conformability around curves and corners, compatibility with polyester and vinylester resins (standard binder system – not epoxy compatible), easy handling with tear or cut-to-size convenience, and uniform fiber distribution for consistent resin wet-out without dry spots. Common applications include boat hull and deck repairs, automotive body panel restoration, roof patching and flashing, shower pan and bathtub reinforcement, pond and water feature liners, custom mold making for fiberglass parts, repair of concrete, wood, metal, and fiberglass surfaces, and structural reinforcement of holes and cracks. Workflow tips: Tear rather than cut the mat to preserve fiber length along edges for optimal edge strength. Use stippling or roller application techniques – not brushing – to fully saturate the mat and eliminate trapped air pockets. Build 2-3 layers minimum for structural-grade strength. For best results, always use a styrene-based polyester or vinylester resin. Avoid epoxy resins with this mat, as the binder will not dissolve properly.

• Premium E-Glass Chopped Strand Mat (CSM): Momotata glass fiber mat delivers isotropic reinforcement with equal strength in all directions for boat hulls, car body panels, roofs, shower pans, and general mold making
• Lightweight 1.5 oz/ft Construction: Our 4-inch wide fiberglass CSM offers excellent balance of low weight and reliable strength for multi-layer laminates where you need resilient yet manageable reinforcement
• Conforms Easily to Curves & Corners: Randomly oriented chopped strands give this mat superior drape and moldability on curved automotive panels, boat decks, rounded roofs, and complex mold surfaces without wrinkling or lifting
• Designed for Polyester & Vinyl Ester Resins: Chemically engineered binder system dissolves properly in styrene-based resins for maximum laminate integrity and achieves complete resin saturation and interlaminar bonding for professional-grade repairs
• Easy Handling Tear or Cut to Exact Size: Our fiberglass mat can be torn to preserve fiber length along edges or precisely cut for custom shapes for small patch repairs on metal, wood, concrete, fiberglass, and more
• Isotropic Strength Distribution: Randomly oriented fibers provide uniform reinforcement in all directions, ensuring consistent structural performance across the entire laminate without weak points or directional limitations
• Multi-Layer Laminate Compatible: Build up 2-3 layers minimum for structural-grade strength with excellent interlaminar bonding between successive layers for durable, long-lasting repairs and fabrication projects