S-glass at a glance
Where to buy
Designation
| Item | Value |
|---|---|
| Designation | S-glass |
| Class | Composites |
| Type | high strength glass fiber |
Glass types compared
| Item | E-glass | S-glass / S2-glass | Source |
|---|---|---|---|
| Role | Electrical grade, low cost | Structural fiberglass of higher strength | FAA-H-8083-31B, p. 7-5 |
| Composition | Borosilicate | Magnesia-alumina-silicate | FAA-H-8083-31B, p. 7-5 |
| Impregnated-strand tensile strength | Reference | 15% higher than conventional glass fiber | AGY, S-2 Glass page |
| Elastic modulus | Reference | 25% higher than conventional glass fiber | AGY, S-2 Glass page |
| Stability at temperature | — | Strength and stability at elevated temperatures up to 760 °C (1,400 °F), fiber level | AGY, S-2 Glass page |
| Colour and forms | White; dry fabric or prepreg | White; dry fabric or prepreg | FAA-H-8083-31B, p. 7-5 |
The AGY percentages compare S2 Glass with conventional glass fiber and are manufacturer claims on the fiber, not laminate values. AGY does not state the test method on its product page.
One style pair: 6781 (S-type yarn) against 7781 (E-type yarn)
| Property | 6781 | 7781 |
|---|---|---|
| Warp / fill yarn | SCG 75 1/0 SC9 68 | ECDE 75 1/0 |
| Weave | 8 harness satin | 8 harness satin |
| Weight, oz/yd² (g/m²) | 8.92 (302) | 8.81 (299) |
| Dry thickness | 9.50 mil (0.24 mm) | 8.6 mil (0.22 mm) |
| Count, warp × fill per in | 57 × 54 | 57 × 54 |
| Breaking strength warp / fill, lbf/in | 550 / 450 | 570 / 450 |
Hexcel HexForce data sheets for 6781 and 7781. The dry fabric breaking strengths printed here do not show an S-glass advantage; the strength benefit AGY describes is in the fiber and the impregnated laminate, so a laminate comparison needs resin-specific data.
Notes from the guide
- Fiber claims, not laminate allowables. AGY’s percentages are for the fiber against conventional glass.
- Not a substitution. The cloth and finish come from the SRM.
- No quartz here. Quartz fabric is not covered because no publishable data sheet could be verified.
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Sources
- FAA-H-8083-31B, AMT Handbook — Airframe, Volume 1 (2023), Chapter 7 — fiberglass types, E-glass, S-glass and S2-glass (p. 7-5).
- AGY, S-2 Glass fiber product page — S2 Glass strength, modulus and temperature claims against conventional glass fiber.
- Hexcel HexForce Style 7781 Fiber Glass Fabric Product Data (DSF_7781) — 8.81 oz/yd², 8 harness satin, 57 × 54, 8.6 mil, 570 / 450 lbf/in.
- Hexcel HexForce Style 6781 Fiber Glass Fabric Product Data (DSF_6781) — 8.92 oz/yd², 8 harness satin, 57 × 54, 9.50 mil, 550 / 450 lbf/in, S-type yarn.
Educational reference only. not approved data. Always consult the applicable SRM, AMM, or AC 43.13-1B and your certifying authority.