I-Chem™ Open-Top Septa Caps, 24-414mm, bonded septa, bulk Aijiren Tech™. Aijiren Tech™ Septa Caps include a bonded-in 0.045 in. thick septa. The same high quality septa caps used on our Aijiren Tech VOA Vials, septa bottles and septa jars. Processed to meet EPA performance–based specifications for Volatile Organic Analysis.