TOC Vials 40 ml Scres Cap 3mm Thick Tan Septa are specifically designed for containing wide range of chemical-based samples that are used for chromatography. They are said to have tough structure with good impact strength and cracking resistance. These vials are completely sterile in nature and can easily be autoclaved for reuse. They are not known to react with contained sample even for long period of time. TOC Vials 40 ml Scres Cap 3mm Thick Tan Septa assures airtight & leak-free cap application with help of crimper. It has ability to store up to 40 ml of sample safely with no microbial contamination.