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A way to determine the quality of the capping process is by measuring the residual seal force (RSF) of the stopper. RSF is the vertical force generated by a compressed elastomeric rubber stopper on the vial land sealing surface after crimping with the aluminum seal. The RSF tester applies a constant rate of compression onto the top of a sealed vial and records the resultant stress-strain profile, from which the value of RSF is derived. It has been shown that CCI performance correlates with RSF values. Note that RSF methodology for seal quality testing is likewise discussed in Chapter <1207>. West scientists have examined the fundamentals of RSF, from a theoretical basis and as a function of time, for example:
Ensuring good CCI is essential for a container system. RSF measurement is an excellent tool that can quickly verify that the component selection and capping conditions will meet requirements. For more on how West can provide support in these areas, contact an Account Manager or Technical Customer Support (TCS) representative; or visit the West Knowledge Center.