Fiberglass Chopped Strand Mat for Composite Reinforcement

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Shandong Rondy Composite Materials Co., Ltd.

Shandong Rondy Composite Materials Co., Ltd. takes advantage of modern composite technology and fiberglass and polyester

Shandong Rondy Composite Materials Co., Ltd. takes advantage of modern composite technology and fiberglass and polyester raw materials to offer high-quality and economical products for various industries, which include construction, marble processing, fiberglass welding safety, fiberglass tarpaulin manufacturing and other related industries. They are one of the best exporters of high performance fiberglass and polyester textile fabrics. They are committed to delivering clients innovative solutions and therefore all their products are marked with a sign of quality.
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High-Performance Chopped Strand Mat for Versatile Composite Reinforcement

Uniform Fiber Distribution for Enhanced Composite Integrity

Rondy’s fiberglass chopped strand mat (CSM) features randomly distributed glass fiber strands bonded with a compatible binder, ensuring uniform strength and dimensional stability in composite structures. This design minimizes resin pooling and voids, creating a consistent reinforcement layer that enhances impact resistance and load-bearing capacity in applications like boat hulls, automotive parts, and industrial tanks.

Superior Resin Wet-out and Process Efficiency

Engineered for optimal resin absorption, Rondy CSM quickly and evenly saturates with polyester, vinyl ester, or epoxy resins, reducing lay-up time and improving production efficiency. The low-fuzz surface and flexible texture make it easy to conform to complex shapes, ideal for hand lay-up, spray-up, and automated molding processes. This adaptability streamlines manufacturing workflows across industries.

Cost-Effective Reinforcement Without Compromise

Rondy balances quality and affordability, offering CSM that meets international standards (e.g., ASTM D3733) at competitive prices. Our large-scale production ensures consistent batch quality, while the mat’s lightweight design reduces material and transportation costs. Ideal for high-volume applications, it delivers reliable performance without exceeding budget constraints.

Durable and Resistant to Harsh Environments

Made from premium E-glass fibers, Rondy CSM provides excellent resistance to moisture, chemicals, and UV radiation. The corrosion-resistant properties make it suitable for outdoor and marine applications, while the flame-retardant variants (upon request) add an extra layer of safety for industrial use.

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In the construction industry, the company’s chopped strand mat for construction is a key material for reinforcing concrete and composite structures. It effectively distributes stress, reduces cracking, and enhances the durability of buildings, bridges, and precast components. Whether used in walls, slabs, or foundations, this mat provides consistent quality, supporting the structural integrity of projects while adhering to strict safety and sustainability standards.

Frequently Asked Questions

What industries commonly use Rondy chopped strand mat?

Rondy CSM is widely used in industries requiring lightweight yet strong composite materials, including marine (boat building), automotive (body panels, trunks), construction (bathroom fixtures, roofing), and wind energy (turbine components). It is also popular in DIY projects and prototyping due to its ease of use.
Unlike woven roving (which uses continuous, aligned fibers for directional strength), Rondy CSM features short, randomly distributed fibers that provide isotropic reinforcement (strength in all directions). This makes CSM ideal for applications requiring uniform stress distribution, while woven roving is better suited for load-bearing structures needing specific directional strength.
Yes, Rondy CSM is compatible with most common thermoset resins, including polyester, vinyl ester, and epoxy. The binder used in our mats is carefully selected to dissolve and bond with these resins, ensuring optimal adhesion and composite performance. For specialized resin systems, we offer custom binder formulations upon request.
Rondy offers CSM in a range of weights, typically from 300 gsm (1.5 oz/yd²) to 1200 gsm (6 oz/yd²), to suit different project requirements. Lighter weights are ideal for thin laminates or decorative applications, while heavier weights provide robust reinforcement for structural components.

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customer evaluation

Mark T., Marine Engineer
"Reliable for Marine Composite Projects"

"As a yacht manufacturer, we’ve relied on Rondy CSM for years to build durable hulls. The mat’s even fiber distribution and easy resin wet-out save us time and ensure consistent quality. Our clients praise the smooth finish and impact resistance, even in rough seas."

Elena S., Production Supervisor
"Perfect for High-Volume Automotive Production"

"Rondy’s CSM is a staple in our automotive composite line. The lightweight mat handles well in automated spray-up systems, and the low fuzz reduces post-processing cleanup. We appreciate the cost-effectiveness and reliability, especially for large orders."

Jake L., DIY Enthusiast
"Exceptional for DIY and Prototyping"

"I’m a hobbyist building a custom motorcycle fairing, and Rondy CSM made the process seamless. The mat cuts easily, conforms to curves without bunching, and the resin soaked in evenly. The final product is strong and lightweight—exactly what I needed."

Li Ming, Construction Manager
"Durable for Outdoor Construction Applications"

"We use Rondy CSM in our fiberglass roofing panels, and it’s proven to withstand years of UV exposure and rain. The mat’s moisture resistance has eliminated delamination issues we faced with other brands. Highly recommend for outdoor projects."

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Advanced Fiber Technology for Optimal Performance

Advanced Fiber Technology for Optimal Performance

Rondy CSM is crafted from high-quality E-glass fibers known for their electrical insulation, mechanical strength, and chemical resistance. The chopped strands (typically 12–24 mm in length) are carefully processed to ensure consistent dispersion, creating a reliable foundation for composite laminates.
Versatile and User-Friendly Design

Versatile and User-Friendly Design

Whether used in small-scale workshops or large industrial facilities, Rondy CSM adapts to various fabrication methods. Its flexibility and conformability make it suitable for complex molds, while the standardized roll sizes (e.g., 1.2 m width) minimize waste and simplify handling.
Commitment to Sustainability and Quality

Commitment to Sustainability and Quality

Rondy prioritizes eco-friendly practices, offering CSM that is fully recyclable at the end of its lifecycle. Our ISO-certified manufacturing processes ensure strict quality control, with each batch tested for fiber content, binder efficiency, and mechanical properties to deliver reliable, high-performance reinforcement.

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