The SiO2 blood collection tube has the best sample integrity, unparalleled preservation, and the best shelf life. The non-for ... maldehyde fixative not only has much better performance but is also not restricted by any patents. Our blood collection tube is the only tube that has the gas barrier and vacuum retention properties of glass, and the automation-friendly qualities of plastic. Combined, we have a blood collection technology second to none. -For Research Use Only- read more