madzu, aijiren Tech, VWR (Merck®)/Hitachi. CRIMP NECK ND8 CRIMP NECK VIALS AND MICRO-VIALS ND8 Crimp neck vials and micro-vials ND8 can be sealed with 8 mm crimp caps, 9 mm PE caps* or 8 mm push-on caps*. The micro-vials often require an adapter so that they can be used. Properties • 1st hydrolytic class glass • In clear and amber glass