Material Analysis | Borosilicate | Soda – Lime | Black Glass |
Silica | 80% | 72% | 69.5% |
Soda | 4% | 15% | 15.4% |
Lime | — | 9% | 3.8% |
Magnesium | — | 3% | — |
Alumina | 2% | 1% | 0.3% |
Boric Oxide | 14% | — | 1.1% |
Manganese Oxide | — | — | 7.2% |
Potassium Oxide | — | — | 2.7% |
Physical Properties | |||
Specific Gravity | 2.23 | 2.47 | 2.53 |
Density | 0.0806 lb/in.3 | 0.0892 lb/in.3 | 0.0914 lb/in.3 |