Glass fiber composite mat(fabric) is a product that combines roving or roving cloth with chopped strands or chopped strand mats.
This versatile product is ideal for reinforcing large-scale multi-layer FRP products such as boats, profiles, wind turbine blades, pipes, tanks, plates, and more.
Fiberglass composite mats(fabrics) come in various types depending on their manufacturing methods and structures.

Which is created by bonding one or more layers of roving and chopped strands with chemical adhesives. For example, the M-type composite mat produced by Syncoglas Company in Belgium uses a powder binder to bond untwisted roving and chopped strands, with a binder content ranging from 4% to 13%. This type of composite felt is suitable for various molding processes, such as hand lay-up, winding, pre-impregnation, RIM, pultrusion, and centrifugal casting.

The Fabmat composite mat by American FGI company, on the other hand, is formed by depositing chopped strands on woven roving cloth and bonding them with chemical binders, making it suitable for manufacturing boats, entertainment equipment, automobile bumpers, and more. Finally, the Fortesil Fabmat composite felt is produced by depositing chopped strands on stitch-bonded unidirectional untwisted roving and bonding them with chemical binders, making it ideal for manufacturing tanks, rods, and other products requiring unidirectional strength.

Additionally, bonded roving and chopped strands can also be bonded into a composite mat using adhesive.

Stitched Composite Mat has the following manufacturing methods:

• 1 – Sew the woven untwisted roving or mesh and chopped strands with sewing thread. For example, Dymriton’s Woven Roving & Combination mat is a product stitched with roving, mesh and chopped strands. These composite felts are suitable for hand lay-up, pre-impregnation, pultrusion, winding, centrifugal forming, etc.
• 2 – Feed the untwisted roving on the machine according to the required direction, and at the same time chop the raw silk on the machine, make it settle on the roving, and sew it up with stitching thread. For example, the Biaxial combination composite mat of Dymriton Company in the United States is made by stitching warp (0°) untwisted roving, weft (90°) untwisted ancestor yarn and raw silk chopped on the machine. This kind of composite felt has excellent applicability, is easy to soak, and has excellent molding performance.
• 3 – Unfold the prefabricated chopped strand mat under the machine, and feed it into the stitching area with different directions of roving at the same time for stitching. For example, the Dymriton multi-directional sewing machine adopts this method. The number of yarn layers in the four directions of the yarn directions of 0°, 90° and ±45° can be combined arbitrarily to form a composite felt with a multi-layer structure.
• 4 – Use bonded roving and glass fiber mat to sew with sewing thread. 

Chopped strands are deposited on roving and bonded by needle punching without using adhesives and stitching threads. For example, the M-type composite felt of American FGI Company, the M-type Fabmat composite felt of the American FGI Company, the Volumat composite felt of the French Chomarat Company, the NM Syncokomplex composite felt of the Belgian Syncoglas Company, and the Needlecloth composite felt of the British Flemings Company all belong to this category. FGI also has a reinforced needle-punched felt called Rovmat. The chopped strands are combined into a felt by needle-punching. There are evenly spaced parallel roving reinforcements in the felt, which is also a composite product.

On the basis of the above-mentioned composite mat, various manufacturers have also developed some composite felts containing a core layer. Examples are as follows:

• 1 – Maltimat Sandwich Composite Mat (Syncoglas company) 

The product is made by suturing chopped fibers on both sides of the high-bulk three-dimensional glass fiber core material, and is an ideal reinforcement material for manufacturing complex-shaped FRP products. Its advantages are that it is entirely made of glass fiber; it has excellent cold preforming performance; it is easy to cut without loosening; it has a fast soaking speed; it uses the unique “spring action” of the glass fiber core to fill the mold, which can reduce cracking and warping, and adapt to Complicated shape without wrinkling, elongation greater than 40% without tearing; product physical properties, especially bending strength, stiffness, shear strength, compressive strength, damage tolerance and impact resistance are excellent. Applicable molding processes are RTM, RIM, SCRIMP, compression molding, vacuum forming.

• 2 – Flow Mat Sandwich Composite Felt (Dymriton composites)   

The non-woven fabric with large-diameter crimped synthetic fibers is used as the core(PP180/PP250) , and chopped E-glass fiber or roving cloth is stitched on both sides to form a sandwich structure. The composite felt is deformable and easy to preform in cold state; it has good flexibility and is easy to position and strengthen; it has a certain thickness and elasticity, and has good elongation (25%) in two directions; it is easy to cut and mold; high temperature resistance; Easy to wet, easy resin flow. Applicable molding process: RTM, SRIM, cold pressing, vacuum bag (film) molding and on-site molding (structural reinforcement of old pipes).

• 3 – Polymat Compressible Sandwich Composite Felt (Flemings company)  

It is made of high-bulk lightweight polyester fiber needle felt as the core, and is made of low-denier polyester fiber yarn stitched with glass fiber surface material.

Fiberglass surface materials can be selected from chopped strands, continuous strand mats, surface mats, rovings or biaxial stitched fabrics. The composite felt is easy to operate and cut; soaks quickly; and has good mold covering and filling properties. Applicable molding processes are cold pressing, hot pressing, bag pressing, RTM, and vacuum bag forming.   

• 4 – Unirov Sandwich Composite Mat (Vetrotex Company)  

Constructed with the company’s famous Unifilo continuous strand mat (low binder content) as the core layer, bonded or stitched chopped strands on both sides. This felt is mainly used in RTM forming process. It is very pliable and fits cold against molds. Its continuous strand mat core material has good permeability, which can ensure the excellent flow state of the resin. It can be used with or without surface felt, and the finished product has excellent surface finish. The felt has various widths and the weight specification is 825-2080g/m2.

• 5 – DymFlow Mat Sandwich Composite Mat (Dymriton Composites)      

This is a newly launched composite mat for closed mold molding. Its core layer is a synthetic fiber nonwoven fabric, with chopped glass fiber and/or continuous fiber reinforcement stitched on both sides, and covered with a surface mat. The combination of these materials produces excellent overmolding properties and increased resin soak-through rates

This composite felt is designed for closed-mold molding processes such as RTM, vacuum impregnation, etc. This type of closed-mold molding process is gaining popularity in the shipbuilding industry. This kind of composite felt has many advantages for shipbuilding: it is more stable than traditional felt; the degree of freedom in boat design is higher; the surface of the part is better than that of woven or knitted fabric reinforcement; It reduces the workload of cutting materials and loading molds. Combined with the corrosion-resistant benefits of the advantex glass fibers used, this composite mat is said to be a unique reinforcement material.

• 6 – Ring Planting Composite Felt  

The Syncoloop mat of Belgium Syncoglas Company is based on conventional glass fiber reinforced substrates such as roving, stitched fabric, stitched felt, needle felt or thin felt, and is formed by attaching roving loops on it. , can be planted on one or both sides. In addition to X and Y directions, this product also provides Z-direction reinforcement, which can be used in occasions requiring high impact strength and delamination resistance; it is easy to fully soak, and the coil is elastic after impregnated with resin, and maintains a vertical position with the substrate. Therefore, it can be made into a light-weight composite material; a product with a thickness of 10 mm can be produced with only one layer of ring-planting felt; the flexibility is excellent, and the thickness can be maintained even in the curved part of the composite material. Can be used as a leak detection function. Can be used as double wall tanks with leak detection, lightweight panels and pipes, reinforced foam panels, lightweight boat hulls, wind turbine blades, etc. Applicable molding process is hand lay-up, injection molding, RTM, vacuum forming, etc.