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

Sale Sold out

Shipping calculated at checkout.

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, vinyl ester and epoxy. In epoxy the binder does not dissolve, so the mat stays stiffer and is best on flat or gently curved work; roll it firmly until no dry white fibers remain.
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 resin
- Epoxy resin, stiffer in epoxy and best on flat or gently curved work

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 and epoxy resins; in epoxy the mat stays stiffer, so it suits flat or gently curved work.

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Technical Specifications

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

MaterialE-Glass (chopped strand)

Weight0.75 oz/ft² (6.75 oz/yd², 229 g/m²)

Weave / ConstructionChopped Strand Mat

Fiber OrientationRandom (chopped)

Thickness0.020"

Available Widths38", 50"

Full Roll Lengthapprox. 150 yd

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

Compatible ResinsPolyester, Vinyl Ester, Epoxy

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, 229 g/m²)	1.5 oz/ft² (13.5 oz/yd², 458 g/m²)	2 oz/ft² (18 oz/yd², 610 g/m²)
Weave	Chopped Strand Mat	Chopped Strand Mat	Chopped Strand Mat
Orientation	Random (chopped)	Random (chopped)	Random (chopped)
Thickness	0.020"	0.045"	0.055"
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, Epoxy	Polyester, Vinyl Ester, Epoxy	Polyester, Vinyl Ester, Epoxy
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?

Plan on about 2.3 times the mat's weight in resin for hand layup. For 1.5 oz mat that is about 3.4 oz of resin per square foot, about 31 oz per square yard, or roughly 32 oz per yard of 38 inch mat and 42 oz per yard of 50 inch mat, per ply. Add about 15% for waste, or use the resin calculator.

Can I use chopped strand mat with epoxy resin?

Yes. Our chopped strand mat works with epoxy for repairs, tabbing, and flat or gently curved panels. The binder that holds the strands together is made to dissolve in polyester and vinyl ester, so in epoxy it stays put: the mat stays stiffer, does not drape as easily into tight curves, and can cure cloudy instead of clear. Roll it firmly until no dry white fibers remain, and for complex shapes use polyester or vinyl ester resin, or a stitched fabric like 1708 biaxial with epoxy.