Cospheric Density Marker Beads are provided at a 20% concentration in an aqueous solution in 2.5ml vials. Our Density Beads are in the 200-300um size range. Unlike GE Healthcare kits that have been discontinued, the Cospheric's colored microspheres are ready for use right out of the vial.
Storage: As no preservatives are added, we recommend unrefrigerated product to be used within 18 months of purchase. The product can be refrigerated or frozen to extend the shelf life of the solution. The density beads are inert and do not degrade over time. However, the solution can degrade causing agglomeration and poor suspension leading to wider bands. If the solution degrades, the beads can be flushed clean, and then re-suspended using our Tween Suspension Protocol.