Nalgene Sterile Micro Vials are molded from high purity, low-metal content polypropylene copolymer (PPCO) resin. The 0.5, and 2.0 vials are skirted, with conical interiors to allow recovery of entire contents. The 1.5-ml vial has a conical design and fits easily in most biotechnology and diagnostic equipment. Vials and closures are pressure-tested together at 7.5 PSIG (51.7kPa) for air shipment. Vials and closures meet requirements of FDA CFR21 177.1520 for food and beverage use, USP Class VI and are non-pyrogenic. Single-use vials can be centrifuged at 13,000 x g.