1.5oz Fiberglass Chopped Strand Mat

Name: 1.5oz Fiberglass Chopped Strand Mat
Brand: Boat Suppliers
SKU: CSM-10538-01
Price: 6.45 USD
Availability: InStock
Rating: 5.0 (3 reviews)

1.5oz Fiberglass Chopped Strand Mat

SKU:CSM-10538-01

$6.45 USD

$6.45 yd

Sale Sold out

Shipping calculated at checkout.

968 in stock

Width: 38"

38" 50"

Length: 1 Yard

1 Yard 3 Yards 5 Yards 10 Yards 20 Yard Roll 30 Yard Roll Full Roll (Approx. 80 Yards)

Quantity

Earn 6 Boat Points Learn More
Ships Today if ordered before 4pm Learn More
Free Shipping on orders over $199 Learn More

For a balance of flexibility and strength, our 1.5 oz Fiberglass Chopped Strand Mat is a go-to material for boat repairs, automotive applications, aerospace layups and composite laminations. This medium-weight mat offers excellent wet-out and superior bonding with polyester and vinyl ester resins, ensuring a strong and durable finish.

Specifications

Includes

Cut to order from a full roll, not pre-packed. Nothing is cut until you order it.

One to ten yards ships folded. Twenty and thirty yard orders ship rolled on a 3" core. Full rolls ship as they come off the mill.

Long cuts may arrive in more than one piece.

Features

1.5 oz per square foot (13.5 oz/yd², 458 gsm) of randomly oriented E-glass. This is the standard mat weight for hull laminate, mold work, and general repair build-up.
Styrene-soluble binder wets out fast and breaks down in polyester and vinyl ester. It will not break down in epoxy, so treat this as a polyester and vinyl ester mat.
Random fiber orientation gives equal strength in every direction and conforms around corners and compound curves without darting.
Builds thickness quickly between structural plies and blocks print-through from woven roving and biaxial.
0.045" thick per ply. Figure roughly 24 oz of resin per yard at 38" and 32 oz per yard at 50".
Cuts clean with shears or a utility knife. Tear the edge instead of cutting it where you want a feathered overlap rather than a hard line.

View full details

Technical Specifications

E-Glass (chopped strand)Chopped Strand MatWorks with Polyester, Vinyl Ester

MaterialE-Glass (chopped strand)

Weight1.5 oz/ft² (13.5 oz/yd², 458 gsm)

Weave / ConstructionChopped Strand Mat

Fiber OrientationRandom (chopped)

Thickness0.045"

Available Widths38", 50"

Full Roll Lengthapprox. 80 yd

Resin-to-Reinforcement Ratio~2.4:1 (resin:glass) by weight

Compatible ResinsPolyester, Vinyl Ester

Best ForMost common mat for mold and boat building

Compare Fabrics

Product	1.5oz Fiberglass Chopped Strand MatYou're viewingfrom $6.45	0.75oz Fiberglass Chopped Strand Matfrom $4.45	2oz Fiberglass Chopped Strand Matfrom $8.95
Material	E-Glass (chopped strand)	E-Glass (chopped strand)	E-Glass (chopped strand)
Weight	1.5 oz/ft² (13.5 oz/yd², 458 gsm)	0.75 oz/ft² (6.75 oz/yd²)	2 oz/ft² (18 oz/yd²)
Weave	Chopped Strand Mat	Chopped Strand Mat	Chopped Strand Mat
Orientation	Random (chopped)	Random (chopped)	Random (chopped)
Thickness	0.045"	—	—
Widths	38", 50"	38", 50"	50"
Full Roll	approx. 80 yd	approx. 150 yd	approx. 60 yd
Resin Ratio	~2.4:1 (resin:glass) by weight	~2.4:1 (resin:glass) by weight	~2.4:1 (resin:glass) by weight
Resins	Polyester, Vinyl Ester	Polyester, Vinyl Ester	Polyester, Vinyl Ester
Best For	Most common mat for mold and boat building	Thin bulk/print-blocking layer behind gelcoat	Heavy mat for fast bulk build
	Selected	View	View

What To Expect When You Order Fabric Rolls

What is chopped strand mat used for?

CSM is ideal for hand lay-up and open-mold applications. It’s used in boat building, mold making, and general fiberglass repair to create strong laminates, fill voids, and provide a smooth finish when layered with polyester resin.

How do I cut and shape chopped strand mat?

CSM can be easily cut with scissors or a utility knife. For complex curves or better blending of layers, it can be torn by hand to help it conform to the mold shape more easily.

Do I need to roll out air bubbles when using chopped strand mat?

Yes, it's important to use a fiberglass roller to eliminate air bubbles and ensure proper wet-out during lay-up. This improves the strength and finish of the final part.

Can chopped strand mat be layered with other materials?

Absolutely. It's commonly used between layers of fiberglass cloth or woven roving to add bulk and prevent print-through in gelcoats or top layers.

Can I use chopped strand mat with epoxy resin?

Most CSM is designed for polyester or vinyl ester resin because the binder in standard mat doesn’t dissolve in epoxy. However, epoxy-compatible chopped strand mat is available and should be used if you’re working with epoxy systems.

How much resin do I need for chopped strand mat?

On average, you’ll need about 1.2 to 1.5 times the weight of the mat in resin. For example, 1.5 oz CSM will require roughly 20–25 oz of resin per yard. Use our Epoxy Calculator to estimate your resin needs, adjusting for polyester if necessary.