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

Low Volume Inserts Ordering Information

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