40oz Fiberglass E Cloth

40 oz, nominal0°/90°38" wide

1 7

Boat Suppliers

40oz Fiberglass E Cloth

SKU:FG-C4038-01

$47.95 USD

$47.95 USD ~~USD~~

$47.95 yd

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Shipping calculated at checkout.

In stock

Width: 38"

38"

Length: 1 Yard

1 Yard 3 Yard Pack 5 Yard Pack 10 Yard Roll 25 Yard Roll Full Roll (50 Yards)

Quantity

Key Specs

Weight: 40 oz/yd² (1356 g/m²), nominal
Fiber Angle: 0°/90° (woven)
Widths: 38 in
Compatible Resins: Epoxy, Polyester, Vinyl Ester
Ships: Folded under 10 yd, rolled from 10 yd

40 oz/yd² double plain weave, 38 in wide. This is the heaviest woven glass we cut, and one ply lays down serious thickness in a single pass. It belongs on structural build-ups where ply count and labor matter more than finish: keel and skeg reinforcement, heavy hull sections, tank and tooling work.

40 oz/yd² E-glass, double plain weave, 0/90
38 in wide
Roughly 1:1 resin to glass by weight, so plan resin volume before you start
Runs in epoxy, polyester or vinyl ester
Cut to 1, 3 and 10 yards, or take the full roll (50 yards)

Heavy cloth needs pressure and time. Roll it hard, work air out from the center, and expect a longer wet-out than you get from 10 oz. Do not stack a second ply until the first one is properly consolidated.

Specifications

Ideal For:

Heavyweight marine and auto repairs
Reinforcing hulls, decks and bulkheads in high-stress areas
Mold making for larger marine parts

Weight:

40 oz/yd² (1356 g/m²), nominal

Widths:

Available in a 38 in width.

Weave:

Double plain weave

Compatible With:

Epoxy, polyester and vinyl ester resins.

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Technical Specifications

E-GlassDouble plain weaveWorks with Epoxy, Polyester, Vinyl EsterWoven in the USA

MaterialE-Glass

Weight40 oz/yd² (1356 g/m²), nominal

Weave / ConstructionDouble plain weave

Fiber Orientation0°/90° (woven)

Thickness0.0386"

Available Widths38"

Full Roll Length50 yd

Resin-to-Reinforcement Ratio~1:1 by weight

Compatible ResinsEpoxy, Polyester, Vinyl Ester

Best ForVery heavy structural build

Compare Fabrics

Product	40oz Fiberglass E ClothYou're viewingfrom $47.95	18oz Fiberglass E Clothfrom $27.45	18oz Woven Rovingfrom $19.44	24oz Woven Rovingfrom $22.39
Material	E-Glass	E-Glass	E-Glass	E-Glass
Style	—	Style 7544	—	—
Weight	40 oz/yd² (1356 g/m²), nominal	approx. 17.8 oz/yd² (604 g/m²), sold as 18 oz	18 oz/yd² (610 g/m²)	24 oz/yd² (814 g/m²)
Weave	Double plain weave	Plain weave (2-end cloth)	Woven Roving	Woven Roving
Orientation	0°/90° (woven)	0°/90° (woven)	0°/90° (woven)	0°/90° (woven)
Thickness	0.0386"	0.0207"	0.030"	0.040"
Widths	38"	50"	50"	50"
Full Roll	50 yd	125 yd	125 yd	approx. 52 yd
Thread Count	—	28 × 14	~5 × 4	~5 × 4
Tensile Strength	—	≥750 / ≥750 lb/in (warp / fill, greige)	—	—
Resin Ratio	~1:1 by weight	~1:1 by weight	~1:1 by weight	~1:1 by weight
Resins	Epoxy, Polyester, Vinyl Ester	Epoxy, Polyester, Vinyl Ester	Epoxy, Polyester, Vinyl Ester	Epoxy, Polyester, Vinyl Ester
Best For	Very heavy structural build	Heavy structural reinforcement	Fast bulk build between mat layers	Heavy bulk build between mat layers
	Selected	View	View	View

What To Expect When You Order Fabric Rolls

Can epoxy resin be used with fiberglass cloth?

Yes, epoxy resin is ideal for wetting out fiberglass cloth and other reinforcements like carbon fiber and Kevlar. It saturates the fabric well and cures into a strong, durable laminate.

Can fiberglass cloth be used on wood or metal?

Yes. With the right resin, fiberglass cloth bonds to wood, metal, foam, and cured fiberglass. Use epoxy for wood and metal, since it grips those substrates far better than polyester. Prep matters more than the cloth: sand to clean, bare material, remove all dust and oil, and wet out the surface before laying the cloth down.

What does the weight (oz) of fiberglass cloth mean?

The weight refers to ounces per square yard. Lighter cloth (e.g., 4oz) is more flexible and used for fine finishing; heavier cloth (e.g., 10oz) provides more strength and bulk.

How do I cut fiberglass cloth?

Use sharp scissors or a rotary cutter on a clean surface. To reduce fraying, run masking tape along the cut line and cut through the middle of the tape, and handle cut edges gently. Keep the cloth dry before layup, since moisture on the glass weakens the resin bond.

What is fiberglass cloth used for?

Fiberglass cloth is used to reinforce composite materials in applications like boat building, surfboard repairs, auto bodywork, and structural laminates. It’s combined with resin to form a strong, lightweight composite.

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.