Aijiren’s 24mm Screw neck EPA Vial includes screw cap sample vials made of type 1 borosilicate clear or brown glass, open caps with PTFE silicone rubber septa, or storage caps lined with PTFE (Can withstand various chemical corrosion). Aijiren EPA vial is widely used in environmental protection, food and pharmaceutical fields. Separate sample vials and cap options can increase application flexibility.