Glass Balls Chart

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