Table 6.

Criteria for determining the availability of chemicals and scoring

Availability criteria	Availability score
High Production Volume chemical, few purchase restrictions, widely used and transported, minimum security (HPV)	5
Commercially Available, No (or few) purchase restrictions, widely used, minimum security (CAN)	4
Commercially Available, major purchase Restrictions, limited use, tight security (CAR)	3
not commercially available, Chemical Synthesis easy, available precursors, standard equipment (CS)	2
not commercially available, Chemical Synthesis Difficult (complex multistep), special equipment (CSD)	1