How does the sealing efficiency of the crystallization supports of the EasyXtal 15-Well Tool compare to grease?

The O-ring on the crystallisation supports of the EasyXtal 15-Well Tool provides a unique grease-free sealing device. A tight seal is maintained even after several opening/closing manipulations. The O-ring material was developed to deliver an evaporation rate similar to that of a setup using grease (and hence similar kinetics). For experiments requiring the use of more volatile reagents QIAGEN has developed the X-Seal crystallization supports which include a new type of O-ring that increases the life of reservoir solutions.