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| 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 |
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Glass Balls Information Page |
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