Glass Fiber Composition
(By Weight)
| E-Glass | S-Glass | |
| Silicone Dioxide | 52 - 56% | 64 - 66% |
| Calcium Oxide | 16 - 25% | 0 - .3% |
| Aluminum Oxide | 12 - 16% | 24- 26% |
| Boron Oxide | 5 -10% | |
| Sodium Oxide & Potassium Oxide | 0 - 2% | 0 - .3% |
| Magnesium Oxide | 0 - 5% | 9 - 11% |
| Iron Oxide | .05 - .4% | 0 - .3% |
| Titanium Oxide | 0 - .8% | |
| Fluorides | 0 -1.0% |