网页Polypropylene 12 x 32mm Screw Neck Vial, with Polyethylene Septumless Cap, 700 µL Volume, 100/pk. When you’re working with compounds and other samples that may stick to a polar glass surface, you’ll want to find an alternative to the classic glass vial. That’s where the Polypropylene Screw Neck Vial comes into consideration.