0.75oz Fiberglass Chopped Strand Mat

Name: 0.75oz Fiberglass Chopped Strand Mat
Brand: Boat Suppliers
SKU: CSM-03438-01
Price: 4.45 USD
Availability: InStock
Rating: 5.0 (1 reviews)

0.75oz Fiberglass Chopped Strand Mat

SKU:CSM-03438-01

$4.45 USD

$4.45 USD ~~$3.12 USD~~

$4.45 yd

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Shipping calculated at checkout.

482 in stock

Width: 38"

38" 50"

Length: 1 Yard

1 Yard 3 Yard Pack 5 Yard Pack 10 Yard Roll 25 Yard Roll Full Roll (Approx. 150 Yards)

Quantity

Order several sizes at once width by length, one add to cart

Width	1 Yard	3 Yard Pack	5 Yard Pack	10 Yard Roll	25 Yard Roll	Full Roll (Approx. 150 Yards)
38"	38" 1 Yard $4.45	38" 3 Yard Pack $11.95	38" 5 Yard Pack $18.95	38" 10 Yard Roll $35.95	38" 25 Yard Roll $68.95	38" Full Roll (Approx. 150 Yards) $289.95
50"	50" 1 Yard $5.45	50" 3 Yard Pack $14.95	50" 5 Yard Pack $23.95	50" 10 Yard Roll $44.95	50" 25 Yard Roll $84.95	50" Full Roll (Approx. 150 Yards) $299.95

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The thinnest chopped strand mat we carry, 0.75 oz per square foot of randomly oriented E-glass held with a styrene-soluble binder. Its job is print blocking: a thin mat layer right behind gelcoat keeps the weave of the structural cloth from telegraphing through the finish. It also conforms into tight radii better than heavier mat, so it works as a first ply in a corner where 2 oz mat would bridge.

Where it goes: first ply behind gelcoat in a mold, tight corners and radii, transitions between cloth plies.
Resin compatibility: polyester and vinyl ester only. The binder needs styrene to break down, so it will not wet out properly in epoxy.
Resin demand: roughly 2.4:1 resin to glass by weight, about 1.8 oz per square foot.
Widths: 38 in and 50 in, cut from 1 yard up to a full roll.

Stipple it, do not brush it. Mat moves if you drag a brush across wet binder.

Specifications

Ideal for:
- Spots where flexibility is needed

- Keeping parts lightweight
- General fiberglass work.
- Marine, Auto & Aerospace Use

Compatible with:
- Polyester resin
- Vinyl ester resins for superior adhesion.

Resin Requirements:
- 38" Width: Approximately 12 oz of resin per yard
- 50" Width: Approximately 16 oz of resin per yard

Weight
0-3/4 oz per square foot
(6.75oz per square yard)

229 gsm

Perfect for Marine, Automotive, and DIY Projects

Product Data Sheet

Includes

.75oz Fiberglass Chopped Strand Mat by the yard

Features

Strong & Durable – Enhances composite strength and impact resistance.
Easy to Work With – Conforms smoothly to curves and contours.
Excellent Wet-Out – Quickly absorbs resin for seamless lamination.
Multi-Purpose Use – Ideal for boat building, repairs, molds, and automotive applications.
Compatible with Polyester & Vinyl Ester Resins – Ensures reliable bonding and performance.

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Technical Specifications

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

MaterialE-Glass (chopped strand)

Weight0.75 oz/ft² (6.75 oz/yd²)

Weave / ConstructionChopped Strand Mat

Fiber OrientationRandom (chopped)

Available Widths38", 50"

Full Roll Lengthapprox. 150 yd

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

Compatible ResinsPolyester, Vinyl Ester

Best ForThin bulk/print-blocking layer behind gelcoat

Material Safety Data Sheet

Compare Fabrics

Product	0.75oz Fiberglass Chopped Strand MatYou're viewingfrom $4.45	1.5oz Fiberglass Chopped Strand Matfrom $6.45	2oz Fiberglass Chopped Strand Matfrom $8.95
Material	E-Glass (chopped strand)	E-Glass (chopped strand)	E-Glass (chopped strand)
Weight	0.75 oz/ft² (6.75 oz/yd²)	1.5 oz/ft² (13.5 oz/yd², 458 gsm)	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. 150 yd	approx. 80 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	Thin bulk/print-blocking layer behind gelcoat	Most common mat for mold and boat building	Heavy mat for fast bulk build
	Selected	View	View

What To Expect When You Order Fabric Rolls

Fiberglass Chop Strand Mat - Boat Suppliers

What is chopped strand mat?

Chopped strand mat (CSM) is a non-woven fiberglass reinforcement made from randomly distributed glass fibers held together with a binder. It’s commonly used in composite layups for its affordability, ease of use, and excellent bulk-building properties.

What’s the difference between fiberglass cloth and chopped mat?

Fiberglass cloth is woven for strength in specific directions, while chopped strand mat is made of randomly oriented fibers and is better for building bulk.

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.

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.

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.