Vials of Polypropylene, Linerless Screw Closures of High-Density Polyethylene. capacity 15 mL Nalgene labware from Sigma-Aldrich.Research Protocols · 300,000+ products · Research ProtocolsBrands: Sigma-Aldrich, Millipore, SAFC, Milli-Q, Supelco, BioReliance