There is an ASTM method that exists and defines what properties the glass must have in order to be called 33 or 51.
| Ions | Type I Class A clear glass(33) | Type I Amber (51) |
|---|---|---|
| Na | 0.3-0.5 | 0.4-1.4 |
| K | ND | ND-0.02 |
| Ca | ND | ND-0.1 |
| Mg | ND | |
| Al | ND | ND-0.5 |
| Fe | ND | ND |
| Ba | ND | ND-0.2 |
| Zn | ND | ND |
| Mn | ND | ND |
| Si | ND | ND-5 |
Results are in ug/ml
ND = Non detectable
