Snap cap vial Snap ring vial / Crimp neck vial Nominal diameter N 8 N 9 N 10 N 11 N 12 N 13 N 15 N 18 N 20 N 22 N 24 Vial material Amber glass, 1st hydrolytic class, glass/glass Amber glass, 1st hydrolytic class glass Clear glass, 1st hydrolytic class, glass