Vials are processed according to EPA recommended wash procedures. Washed with laboratory grade biodegradable, non-phosphate detergent, rinsed with ASTM Type 1 De-ionized water, oven dried, and assembled in a contaminate-free environment. The exterior of each case is labeled with a lot number. each case contains a copy of wash "Standard Operating Procedure". An independent laboratory is used to certify the containers cleanliness assuring impartial results.