Polyvials™ SG Standard Medical Grade Polypropylene lab vials are intended for wide-ranging, non-reactive or non-sensitive applications. The convenient hinged lid snaps closed for easy handling. Polyvials™ lids have a plug seal that fits inside the lip of the container creating a moisture resistant and airtight closure. These plastic containers are molded from the highest quality Class VI USP medical grade polypropylene. This allows for autoclave sterilization in the presence of aqueous solutions. FDA conforming clarified natural polypropylene. Examine the list of items below to decide which part is correct for your product. Then go to the part number by clicking on its' link in the chart corresponding to the size you need and/or scroll down to the pictures below.