What are EPA regulations for caps and septa?
The U.S. Environmental Protection Agency does not regulate specific caps or septa as standalone products. Instead, it defines performance requirements through analytical methods used for environmental testing of water, soil, and air.
For example, methods like EPA 8260 for volatile organic compound (VOC) analysis require that vial closures maintain sample integrity by preventing contamination, adsorption, or loss of analytes. Caps and septa used in these applications must therefore be low-bleed, chemically inert, and capable of maintaining a proper seal under test conditions.
