Available in 0.5ml, 0.75ml, 1.1ml and 1.4ml sizes these laser etched alphanumeric coded sample storage tubes are manufactured from high quality polypropylene in a fully automated class 7 clean room environment. They exhibit absolute product consistency, near zero contaminants and compliance with US and European Pharmacopoeia tests. They have flat polypropylene bottoms on which the alphanumeric code is encrypted with a laser. The code of Micronic laser encrypted alphanumeric codes cannot fade or peel off even when subjected to repeated handling, exposure to different solvents or multiple freeze-thaw cycles.