8.9oz Fiberglass E Cloth - Style 7781 Satin Weave

SKU:FG-C0850-01

$16.95 USD

$16.95 yd

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100 in stock

Width: 50"

50"

Length: 1 Yard

1 Yard 3 Yards 10 Yards Full Roll (125 Yards)

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Style 7781 is the 8-harness satin E-glass that tooling shops and aircraft builders order by number. Each yarn floats over seven and under one, so the cloth lies flatter than a plain weave and drapes into compound curves without bridging. 8.9 oz/yd² (302 g/m²), 57 × 54 construction, 0.009" (0.23 mm) thick, 50" wide.

Use it where you want strength and a clean surface out of the same ply: mold and plug skins, tooling laminates, fairings, and the finish ply on boat and aircraft parts. The flat weave wets out clear and cuts down on print-through under gelcoat and paint. Works with epoxy, polyester or vinyl ester.

Two things before you cut. Satin distorts more than plain weave once it is off the roll, so move cut pieces flat and don't drag them across the table. And one face is mostly warp yarns while the other is mostly fill, so flip every other ply for a balanced laminate. See how to pick a cloth weight for the full comparison.

Specifications

Ideal for:

Mold and plug skins, tooling laminates, fairings and finish plies.

Size Options:

50" wide, by the yard or 125 yd full roll.

Compatible with:

Epoxy, polyester and vinyl ester resins.

Weight:

8.9 oz per square yard (302 g/m²)

Style 7781 8-harness satin E-glass. Flatter and more drapeable than plain weave, the standard choice for molds, tooling and finish plies.

Includes

8.9oz Style 7781 fiberglass cloth by the yard

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Technical Specifications

E-Glass8-Harness SatinWorks with Epoxy, Polyester, Vinyl Ester

MaterialE-Glass

Industry Style #Style 7781

Weight8.9 oz/yd²

Weave / Construction8-Harness Satin

Fiber Orientation0°/90° (woven)

Thickness0.009"

Available Widths50"

Full Roll Length125 yd

Thread Count57 × 54

Tensile / Breaking Strength550 / 450 lb/in (warp/fill, typical)

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

Compatible ResinsEpoxy, Polyester, Vinyl Ester

Best ForMolds, tooling and compound curves

Compare Fabrics

Product	8.9oz Fiberglass E Cloth - Style 7781 Satin WeaveYou're viewingfrom $16.95	8.5oz 2x2 Twill Fiberglass E Clothfrom $10.66	10oz Fiberglass E Clothfrom $9.75	8.9oz Fiberglass S Cloth - Style 6781 Satin Weavefrom $27.99
Material	E-Glass	E-Glass	E-Glass	S-2 Glass
Style	Style 7781	BGF 7725	BGF 7500	Style 6781
Weight	8.9 oz/yd²	8.5 oz/yd²	10 oz/yd²	8.9 oz/yd²
Weave	8-Harness Satin	2x2 Twill	Plain weave	8-Harness Satin
Orientation	0°/90° (woven)	0°/90° (woven)	0°/90° (woven)	0°/90° (woven)
Thickness	0.009"	0.0096"	0.0154"	0.0097"
Widths	50"	38", 50"	38", 50"	38"
Full Roll	125 yd	125 yd	125 yd	125 yd
Thread Count	57 × 54	54 × 18	16 × 14	58 × 54
Tensile Strength	550 / 450 lb/in (warp/fill, typical)	580 / 390 lb/in (warp/fill, dry)	490 / 430 lb/in (warp/fill, dry)	560 / 470 lb/in (warp/fill, dry)
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	Molds, tooling and compound curves	Drapable layup over compound curves	Medium-weight structural reinforcement	Strong, drapable structural skins (S-glass)
	Selected	View	View	View

What To Expect When You Order Fabric Rolls

Style 7781 fiberglass cloth specs: 8.9 oz/yd², 8-harness satin, 50 inch width, 57 x 54 thread count

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 10 oz fiberglass cloth be used on wood or metal?

Yes. With the right resin, 10 oz 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 utility knife. To reduce fraying, you can lightly mist the cloth with water or use tape to mark the cutting line.

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.