These 5 ml clot activator tubes are made by Chargen Life Sciences. These clot activator tubes are sterile and disposable. This 5 ml clot activator tube is made from high quality Polypropylene and measure 13 x 75 mm in length. They can draw upto 5 ml of blood quickly and easily. They have been designed in such a manner that a certain amount of blood is drawn into the tube by vacuum according to the amount of pre-filled anticoagulant in the tube. The rubber stopper is red in colour and made from Butyl which is of analytical grade and quality. The shelf life is clearly marked onto the tubes for the users benefit. The advantage of using these tubes is that they can easily be handled with one hand, leaving the other one absolutely free. The recapping method is easy too. These 5 ml clot activator tubes are widely used for serum testing in various fields like Immunology, Serology, Microbiology and Clinical Chemistry. These clot activator tubes are coated with micronized silica particle which activate the serum to clot rapidly. These tubes are suitable for clinical serum and blood donor screening chemistry tests as well.