Vials are labeled with the part number, lot number and tare weight in print as well as barcode format. 40ml Volatile Organic Chemical sampling vial-Voa Vial . Sampling vials | Sigma-Aldrich Hide. 854984. black polypropylene hole cap, thread for 8-425, PTFE/rubber septum, for use with 11.6 × 32 mm vial (standard opening), pkg of 1000 ea. Expand.