Fiberglass Chopped Strand Mat Veil is also known as CSM, is made from chopped strands of glass fiber bound together with powdered or emulsion binders.
It is made from either C-glass or E-glass and mostly used in hand lay-up process alongside glass/carbon/Kevlar fiber cloth.
Key Features
- Compatible with a variety of resin systems
- Uniformly distributed fiber strands and binder
- Flexible, good for complex shapes
- High mechanical strength
List of Chopped Strand Mat
Weight (in GSM) | Filament Diameter(in μ) | Loss on ignition(%) | Width (in mm) |
100 | 11 | 3-10 | 1040/2080 |
250 | 11 | 3-10 | 1040/2080 |
300 | 13 | 2-5 | 1040/2080 |
450 | 13 | 2-5 | 1040/2080 |
600 | 13 | 2-5 | 1040/2080 |
All the above weights are available in E-glass as well as C-glass and with powder as well as emulsion binders.
FAQ:
How to choose Fiberglass Chopped Strand Mat or Surface Veil for Stone Reinforcement?
Choosing a fiberglass chopped strand mat (CSM) or surface veil for stone reinforcement (such as backing slabs, marble, or granite countertops) requires evaluating several technical and application-oriented factors:
1. Mat Type: Chopped Strand Mat vs. Surface Veil
• Chopped Strand Mat (CSM): Made of randomly oriented short fibers held together by a binder. It provides multi-directional reinforcement, builds thickness quickly, and absorbs high amounts of resin to add structural rigidity to fragile or cracked stone slabs.
• Surface Veil / Tissue: An exceptionally thin, lightweight mat used primarily for smooth finishes, preventing fiber print-through, or creating a clean protective barrier on the back/surface of composite assemblies. For heavy structural reinforcement of stone, a heavier CSM is typically used, sometimes layered with a veil.
2. Areal Weight and Thickness
• Lighter Weights (e.g., 225 g/m² / 0.75 oz or lower): Ideal for minor repairs, tight corners, or applications where minimal weight and thinness are required.
• Standard Weights (e.g., 300–450 g/m² / 1.5 oz): The most common choice for general reinforcement and backing support, striking a balance between strength and flexibility.
• Heavier Weights (e.g., 600 g/m² / 2 oz or above): Used when maximum stiffness, bulk build-up, and high load-bearing capacity are needed for large or high-stress stone slabs.
3. Binder Type (Emulsion vs. Powder)
• Emulsion-Bonded Mats: Bound with an emulsion that dissolves slowly; typically softer, very compliant, and well-suited for hand lay-up contours.
• Powder-Bonded Mats: Dissolves faster and more thoroughly in styrene-containing resins, offering quick wet-out and uniform structural integrity.
4. Resin Compatibility
• Standard fiberglass chopped strand mats use a binder that requires styrene to dissolve properly.
• They are normally compatible with polyester and vinyl ester resins.
• If your stone reinforcement process calls for epoxy resin, standard CSM will not bond or wet-out correctly unless you source a specialized, epoxy-compatible mat. Always match the mat binder to your resin chemistry.
5. Application and Environmental Conditions
• Wet-Out Speed: Choose a mat with fast wet-out characteristics if you need the resin to saturate the fibers quickly before assembly or curing.
• Flexibility vs. Rigidity: Softer or lighter veils/mats conform better to irregular stone backs, veins, or contoured profiles.
• Testing: Always perform a small trial sample with your specific stone type, resin, and local ambient temperature/humidity before full-scale production.
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