Chopped Strand Mat 1.5 Oz. 50" X Yd

GRP-M12715X50

1.5oz MAT.x 50"

Chopped Strand Mat (CSM) is a widely used traditional reinforcement solution.

Chopped Strand Mat (CSM) is a random fiber mat that provides equal strength in all directions and is used in a variety of hand lay-up and open-mold applications. Chopped strand mat is produced by chopping continuous strand roving into short 1.5 to 3 inch lengths and dispersing the cut fibers randomly over a moving belt to form a “sheet” of random fiber mat. A binder is applied to hold the fibers together and the mat is trimmed and rolled. Because of is random fiber orientation, chopped strand mat conforms easily to complex shapes when wet-out with polyester or vinyl ester resins.  

CSM is made of short strands of fiberglass held together by a styrene binder. Fabricators usually tear CSM rather than cut it to maintain the length of the fibers along the edge.

Chopped strand mat (CSM), also known as fiberglass mat, has many benefits, including:

• Strength and durability
• Water resistance
• Molding
• Ease of use
• Cost-effective
• Versatile
• Pairs well with woven roving
• Compatibility

CSM is strong and durable, providing long-term protection from abrasion and other damage. It is highly water resistant, making it ideal for boat hulls and decks. CSM can mold into intricate shapes, making it useful for manufacturing aerodynamic watercraft. It is easy to handle and apply, and it conforms to irregular shapes. CSM is generally more affordable than woven fabrics. It can be used as a foundational material, or as a print through layer between gel coat and woven fiberglass. CSM can fill in gaps in the roving weave, creating a strong laminate. It is compatible with polyester and vinyl ester resins, but not epoxy resin.