8.9oz Fiberglass S Cloth - Style 6781 Satin Weave

SKU:FG-6781-38

$27.99 USD

$27.99 yd

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100 in stock

Width: 38"

38"

Length: 1 Yard

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

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Style 6781 is the S-2 glass version of 7781: the same 8-harness satin weave, weight and thread count, woven from S-2 fiber for roughly 25 to 30 percent more breaking strength than E-glass at the same weight. 8.9 oz/yd² (302 g/m²), 0.0097" (0.25 mm) thick, 38" wide.

Reach for it when a part has to be as strong as possible without adding plies: high-load skins, race hulls, board rails, aircraft and prototype parts. It drapes like 7781, lays flat into compound curves and wets out clear. Works with epoxy, polyester or vinyl ester; pair it with epoxy to get the most out of the fiber.

Handle it like any satin: move cut pieces flat, and flip every other ply for a balanced laminate, since one face is mostly warp and the other mostly fill. Same weave for less money: Style 7781 E-glass in 50" width.

Specifications

Ideal for:

High-load skins, race hulls, board rails, aircraft and prototype parts.

Size Options:

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

Compatible with:

Epoxy, polyester and vinyl ester resins.

Weight:

8.9 oz per square yard

Style 6781 S-2 glass 8-harness satin. The 7781 weave with roughly 25 to 30 percent more breaking strength than E-glass.

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Technical Specifications

S-2 Glass8-Harness SatinWorks with Epoxy, Polyester, Vinyl Ester

MaterialS-2 Glass

Industry Style #Style 6781

Weight8.9 oz/yd²

Weave / Construction8-Harness Satin

Fiber Orientation0°/90° (woven)

Thickness0.0097"

Available Widths38"

Full Roll Length125 yd

Thread Count58 × 54

Tensile / Breaking Strength560 / 470 lb/in (warp/fill, dry)

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

Compatible ResinsEpoxy, Polyester, Vinyl Ester

Best ForStrong, drapable structural skins (S-glass)

Compare Fabrics

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