Polypropylene Vials are especially used for Ion Chromatography, Atomic Absorption and Capillary Electrophoresis (CE + CE/MS), as they are nonionic and nonreactive and do not contain any heavy metals. Polar components, such as proteins and amino-acids, can better be analysed in plastic vials due to the reduced adsorption of the inner vial walls as can aqueous or pH-sensitive samples in HPLC. While up to now mainly Polypropylene Micro-Vials with a conical insert and a filling volume of 0.3ml have been offered, La-Pha-Pack® has now introduced 0.7ml Vials with cylindrical insert. All these types are available as 9mm Short Thread or 11mm Snap Ring versions, while the 0.3ml Micro-Vials can even be obtained in amber Polypropylene for light sensitive substances or in crystal clear TPX. Furthermore a 9mm Short Thread Vial with a filling volume of 1.5ml is also offered in transparent or amber Polypropylene. Although its main usage is in Ion Chromatography, it is also an ideal sample container for pH-sensitive and aqueous samples in HPLC. The vial is characterized by a slightly concave shaped inner bottom that reduces dead volume and offers ideal conditions for the needle for sample pick up. Filling lines facilitate handling. All plastic vials are supplied in tamper-proof evident zip-lock bags with 100 pieces each.