网页Polypropylene is chemically resistant and the material of choice for pH-sensitive samples, sodium, or heavy metal analyses. Polypropylene vials are translucent. 9mm Clear Screw Top Plastic Autosampler Vial Material: Polypropylene Total volume: 2.0 mL Recommended fill: 1.5 mL Dimensions: 12*32 mm Openings: 9-425 screw top Bottom style: flat bottom