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Fiberglass Stitched Mat, also commonly referred to as Fiberglass Knitted Mat, is a high-performance reinforcing material engineered for composite manufacturing. Fiberglass stitched mat is produced by chopping glass fiber rovings into precise lengths, dispersing them uniformly and randomly onto a optional glass roving base layer, and then mechanically stitching the entire structure together using fine polyester threads. This stitching process eliminates the need for chemical binders, ensuring the mat retains the inherent properties of glass fibers while achieving excellent structural integrity.

It is compatible with UP and EP resin systems.

Stitched mat is mostly applied primarily in pultrusion, RTM, filament winding, compression molding and lay-up processes. Typical end-use products include pultruded pipes, storage tanks, wind generator blades and other FRP products.

Identification:

What are the key features of fiberglass stitched mat? 

Binder-Free Construction: Assembled via mechanical stitching rather than chemical binders, avoiding resin compatibility issues and potential performance degradation caused by binder volatilization during molding.

Superior Uniformity: Precision-controlled chopping and dispersion processes ensure consistent fiber distribution across the mat, preventing localized thickness variations and enhancing composite quality stability.

Excellent Resin Wet-Out: Loose yet stable fiber structure allows resin to penetrate quickly and completely, reducing molding time and minimizing voids in finished composites.

Strong Isotropy: Random fiber orientation combined with cross-stitching creates balanced mechanical properties in all directions, avoiding directional weakness common in woven fabrics.

Versatile Process Adaptability: Compatible with various composite molding techniques, maintaining structural stability during pultrusion, winding, and compression processes.

Consistent Dimensional Stability: Low shrinkage rate (<0.5%) during molding, ensuring finished products meet tight dimensional tolerances.

Good Tear Resistance: Stitching threads reinforce the fiber network, preventing fiber shedding and improving the mat’s handling durability during cutting and installation.

How many types of fiberglass stitched mat are there?

Fiberglass Stitched Mats are categorized based on glass fiber type, each tailored to specific composite performance requirements. The popular fiberglass stitched mats are E glass mat, C glass mat and High silica glass mat.

What are the advantages and benefits of fiberglass stitched mat?

Compared to traditional composite reinforcing materials (such as woven glass cloth, chopped strand mats, and non-woven needled mats), Fiberglass Stitched Mat offers distinct competitive advantages as below:

Enhanced Composite Performance: Isotropic mechanical properties eliminate directional weaknesses, improving the flexural and impact strength of finished products by 15%-25% compared to woven fabrics.

Optimized Production Efficiency: Fast resin wet-out (≤60 seconds) reduces molding cycle time by 20%-30%, while uniform fiber distribution minimizes post-processing work.

Reduced Material Waste: Stable structure prevents fiber shedding during cutting and handling, lowering material waste rate to <3% (vs. 5%-8% for chopped strand mats).

Superior Resin Compatibility: Binder-free design ensures seamless integration with UP, EP, and VE resin systems, avoiding chemical reactions and ensuring strong fiber-resin bonding.

Cost-Effective Reinforcement: Balances high performance with competitive pricing; reduces total composite weight by optimizing fiber usage, lowering transportation and raw material costs.

Consistent Quality: Precise manufacturing controls ensure uniform area weight and fiber distribution, reducing composite part rejection rates by up to 40%.

Flexible Customization: Wide range of area weights, widths, and glass fiber types available, supporting specialized composite requirements without compromising performance.

Environmental Friendliness: Binder-free composition reduces volatile organic compound (VOC) emissions during molding; glass fibers are recyclable, aligning with sustainable manufacturing practices.

What applications is fiberglass stitched mat used for?

Fiberglass Stitched Mat is a foundational reinforcing material in composite manufacturing, widely used across industries due to its balanced performance and process adaptability. Its applications span from general-purpose composites to high-performance structural components:

4.1 Composite Manufacturing Processes

Pultrusion: Key reinforcing material for continuous production of FRP profiles (e.g., rods, angles, channels, and pultruded pipes), ensuring uniform strength and surface smoothness.

Resin Transfer Molding (RTM): Ideal for complex-shaped components (e.g., automotive parts, aerospace interiors) due to fast resin infiltration and consistent fiber distribution.

Filament Winding: Enhances hoop and axial strength of cylindrical products (e.g., pressure vessels, chemical pipes, gas cylinders) by complementing continuous roving reinforcement.

Compression Molding: Used in high-volume production of thin-walled components (e.g., electrical enclosures, automotive panels) for its quick molding and dimensional stability.

Hand Lay-Up & Spray-Up: Suitable for custom FRP products (e.g., boat hulls, bathtubs, decorative panels) due to easy handling and compatibility with on-site processing.

4.2 End-Use Industry Applications

Infrastructure & Construction: FRP pipes for water supply and drainage, corrosion-resistant gratings, bridge reinforcements, and architectural cladding panels.

Energy Sector: Wind turbine blades (high-strength Glass type), solar panel frames, and oil/gas pipeline coatings for corrosion protection.

Chemical & Petrochemical: Storage tanks for acids/alkalis, chemical reaction vessels, and FRP scrubbers (ECR Glass corrosion-resistant type).

Transportation: Automotive interior components (door panels, dashboards), marine hulls and decks, and railway carriage parts (lightweight and high-strength).

Electrical & Electronics: Insulating enclosures, cable trays, and transformer housings (excellent electrical insulation properties).

Consumer Goods: Bathtubs, shower stalls, furniture components, and sports equipment (e.g., surfboards, kayaks) for durability and moldability.

How to store and handle fiberglass stitched mat?

Store in original packaging until use to protect against moisture, dust, and fiber contamination.

Maintain storage temperature between 15℃ and 35℃; avoid extreme temperatures (below 0℃ or above 40℃) which may affect fiber flexibility.

Control relative humidity in the storage area at 35%-65%; keep away from water sources, damp floors, or direct exposure to rain or humidity.

Store in a clean, dust-free environment; avoid contact with oil, grease, or chemical substances that may degrade fiber performance.

Stack rolls horizontally on flat pallets, with maximum stack height not exceeding 1.2 meters to prevent compression deformation.

Handle with clean gloves during processing to avoid oil transfer; use sharp, clean cutting tools to ensure neat edges and prevent fiber fraying.

FAQ

Question 1: What is the wet-out rate of the fiberglass stitched mat?

A: It is Not more than 60 seconds.

Question 2: Can the stitched mat be used with high-temperature curing resins, and will the polyester stitching thread be affected?

A: Standard polyester stitching threads can withstand curing temperatures up to 120℃, which is compatible with most UP and VE resin systems. For high-temperature curing (150℃-200℃, e.g., high-performance epoxy resins), we offer mats stitched with glass fiber threads that maintain stability at elevated temperatures. Please specify curing conditions when ordering.

Question 3: What is the difference in performance between E-Glass, and ECR-Glass stitched mats?

A: E-Glass is cost-effective for general applications; ECR-Glass offers superior corrosion resistance (especially to acids and alkalis), ideal for chemical environments. 

Question 4: How does the area weight of the stitched mat affect composite performance?

A: Higher area weight (e.g., 600g/m²) increases composite thickness and strength but may slightly extend resin wet-out time. Lower area weight (e.g., 300g/m²) is suitable for thin-walled components and ensures fast molding. For optimal results, we recommend 380-450g/m² for most general applications, and custom combinations of different weights for thick composites.

Question 5: Does the fiberglass stitched mat have electrical insulation properties, and can it be used in high-voltage applications?

A: E-Glass and ECR-Glass stitched mats have excellent electrical insulation (volume resistivity ≥10¹² Ω·cm at 25℃), making them suitable for low-to-medium voltage applications (e.g., electrical enclosures, cable insulation). For high-voltage scenarios (≥10kV), we recommend our specialized insulation-grade stitched mat with enhanced fiber purity and low ion content.

Question 6: Can the fiberglass stitched mat be used in marine environments, and how does it resist seawater corrosion?

A: Yes. ECR-Glass stitched mats are specifically designed for marine use. They resist seawater corrosion and hydrolysis, with a service life of 10-15 years in saltwater environments. When combined with marine-grade vinyl ester resin, the composite achieves excellent resistance to barnacle growth and seawater erosion.